BROCADE COMMUNICATIONS SYSTEMS INC
S-1/A, 1999-05-05
PREPACKAGED SOFTWARE
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<PAGE>   1
 
   
      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON MAY 5, 1999
    
 
                                                      REGISTRATION NO. 333-74711
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------
 
   
                                AMENDMENT NO. 3
    
                                       TO
 
                                    FORM S-1
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                            ------------------------
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
                            ------------------------
 
   
<TABLE>
<S>                               <C>                               <C>
      CALIFORNIA (PRIOR TO                      3577                           77-0409517
        REINCORPORATION)            (PRIMARY STANDARD INDUSTRIAL            (I.R.S. EMPLOYER
DELAWARE (AFTER REINCORPORATION)     CLASSIFICATION CODE NUMBER)         IDENTIFICATION NUMBER)
 (STATE OR OTHER JURISDICTION OF
 INCORPORATION OR ORGANIZATION)
</TABLE>
    
 
                             1901 GUADALUPE PARKWAY
                           SAN JOSE, CALIFORNIA 95131
                                 (408) 487-8000
  (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE, OF
                   REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)
                            ------------------------
 
                                GREGORY L. REYES
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
                             1901 GUADALUPE PARKWAY
                           SAN JOSE, CALIFORNIA 95131
                                 (408) 487-8000
 (NAME, ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER, INCLUDING AREA CODE,
                             OF AGENT FOR SERVICE)
                            ------------------------
 
                                   COPIES TO:
 
<TABLE>
<S>                                              <C>
                LARRY W. SONSINI                                 GREGORY M. GALLO
                JOHN T. SHERIDAN                                DENNIS C. SULLIVAN
              ALISANDE M. ROZYNKO                                JULIE F. HANIGER
        WILSON SONSINI GOODRICH & ROSATI                 GRAY CARY WARE & FREIDENRICH LLP
            PROFESSIONAL CORPORATION                           400 HAMILTON AVENUE
               650 PAGE MILL ROAD                        PALO ALTO, CALIFORNIA 94301-1825
        PALO ALTO, CALIFORNIA 94304-1050                          (650) 328-6561
                 (650) 493-9300
</TABLE>
 
                            ------------------------
 
        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
As soon as practicable after the effective date of this Registration Statement.
                            ------------------------
 
    If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, as amended, check the following box.  [ ]
 
    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration number of the earlier effective
registration statement for the same offering.  [ ]
 
    If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]
 
    If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  [ ]
                            ------------------------
 
    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933, AS AMENDED OR UNTIL THE REGISTRATION STATEMENT SHALL
BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING
PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<PAGE>   2
 
THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY
NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER
TO SELL THESE SECURITIES AND IT IS NOT SOLICITING AN OFFER TO BUY THESE
SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.
 
PROSPECTUS (Subject to Completion)
 
   
Issued May 5, 1999
    
 
                                3,250,000 Shares
                                 [BROCADE LOGO]
                                  COMMON STOCK
                            ------------------------
 
BROCADE COMMUNICATIONS SYSTEMS, INC. IS OFFERING 3,250,000 SHARES OF ITS COMMON
STOCK. THIS IS OUR INITIAL PUBLIC OFFERING AND NO PUBLIC MARKET CURRENTLY EXISTS
FOR OUR COMMON STOCK. WE ANTICIPATE THAT THE INITIAL PUBLIC OFFERING PRICE WILL
                        BE BETWEEN $8 AND $10 PER SHARE.
 
                            ------------------------
 
     WE HAVE APPLIED TO LIST THE COMMON STOCK ON THE NASDAQ NATIONAL MARKET
                            UNDER THE SYMBOL "BRCD."
 
                            ------------------------
 
                 INVESTING IN THE COMMON STOCK INVOLVES RISKS.
                    SEE "RISK FACTORS" BEGINNING ON PAGE 5.
                            ------------------------
 
                        PRICE $                  A SHARE
                            ------------------------
 
<TABLE>
<CAPTION>
                                                           UNDERWRITING
                                           PRICE TO        DISCOUNTS AND         PROCEEDS
                                            PUBLIC          COMMISSIONS         TO BROCADE
                                           --------        -------------        ----------
<S>                                        <C>             <C>                  <C>
Per Share................................  $                 $                   $
Total....................................  $                 $                   $
</TABLE>
 
The Securities and Exchange Commission and state securities regulators have not
approved or disapproved these securities, or determined if this prospectus is
truthful or complete. Any representation to the contrary is a criminal offense.
 
Brocade has granted the underwriters the right to purchase up to 487,500
additional shares to cover over-allotments. Morgan Stanley & Co. Incorporated
expects to deliver the shares of common stock to purchasers on           , 1999.
 
                            ------------------------
 
MORGAN STANLEY DEAN WITTER
                  BT ALEXS BROWN
                                                           DAIN RAUSCHER WESSELS
                                        a division of Dain Rauscher Incorporated
               , 1999
<PAGE>   3
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                      PAGE
                                      ----
<S>                                   <C>
Prospectus Summary..................    3
Risk Factors........................    5
Special Note Regarding
  Forward-Looking Statements........   15
Use of Proceeds.....................   16
Dividend Policy.....................   16
Capitalization......................   17
Dilution............................   18
Selected Financial Data.............   19
Management's Discussion and Analysis
  of Financial Condition and Results
  of Operations.....................   20
Business............................   30
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                      PAGE
                                      ----
<S>                                   <C>
Management..........................   42
Certain Transactions................   54
Principal Stockholders..............   58
Description of Capital Stock........   61
Shares Eligible for Future Sale.....   64
Underwriters........................   66
Legal Matters.......................   68
Experts.............................   68
Change in Independent Accountants
  and Fiscal Year End...............   68
Where You May Find Additional
  Information.......................   69
Index to Financial Statements.......  F-1
</TABLE>
    
 
                           -------------------------
 
     You should rely only on the information contained in this prospectus. We
have not authorized anyone to provide you with information different from that
contained in this prospectus. We are offering to sell, and seeking offers to
buy, shares of common stock only in those jurisdictions where offers and sales
are permitted.
 
   
     Unless otherwise specifically stated, the information in this prospectus
has been adjusted to reflect the assumed exercise of warrants to purchase 73,699
shares of preferred stock prior to this offering and the subsequent conversion
of all outstanding shares of preferred stock into common stock on the completion
of this offering, but does not take into account the possible issuance of
additional shares of common stock to the underwriters pursuant to their right to
purchase additional shares to cover over-allotments.
    
 
     UNTIL              , 1999, 25 DAYS AFTER COMMENCEMENT OF THIS OFFERING, ALL
DEALERS EFFECTING TRANSACTIONS IN OUR COMMON STOCK, WHETHER OR NOT PARTICIPATING
IN THIS OFFERING, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS DELIVERY
REQUIREMENT IS IN ADDITION TO THE DEALERS' OBLIGATION TO DELIVER A PROSPECTUS
WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD ALLOTMENTS OR
SUBSCRIPTIONS.
 
                                        2
<PAGE>   4
 
                               PROSPECTUS SUMMARY
 
     You should read this summary together with the more detailed information
and our financial statements and notes to the financial statements appearing
elsewhere in this prospectus.
 
   
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
    
 
     We are the leading provider of switching solutions for storage area
networks, commonly referred to as SANs, which are networks that connect a
company's data storage systems and computer servers. Our switching solutions
utilize the Fibre Channel interconnect protocol, an industry networking standard
designed for data-intensive transfers. Our family of SilkWorm switches enables a
company to cost-effectively manage growth of its data storage requirements,
improve the data transfer performance between its servers and data storage
systems and increase the size and scope of its SAN, while allowing the company
to operate data-intensive computer applications, such as data backup and
restore, on the SAN. We sell our SAN switching solutions through original
equipment manufacturers that combine our products with their own products and
sell the combined products under their own brand, and system integrators that
integrate our products with products of other manufacturers. Our customers
include Compaq Computer, Dell Computer, McDATA Corporation, Sequent Computer
Systems and StorageTek.
 
     Over the past decade, the volume of business-critical data that is being
captured, processed, stored and manipulated in business environments has
exploded, creating a data transmission bottleneck between storage systems and
servers. In response to the demand for high-speed and high-performance
storage-to-server and server-to-server connectivity, the Fibre Channel
interconnect protocol was developed in the early 1990s and has earned broad
support from storage and server industry leaders. Fibre Channel's support for
networked connections, large data block transfers and multiple protocols enables
SANs to meet the increasing performance, scalability, flexibility and management
requirements of companies' data processing centers.
 
     Our SilkWorm family of Fibre Channel switches provides a switch
interconnect, enabling any-to-any connectivity between storage systems and
servers. Multiple interconnected switches enable the deployment of our Brocade
Fabric, which includes our Brocade Fabric Operating System, SAN management
tools, fabric services and ready-to-deploy configurations. Our SAN solutions
offer the following benefits:
 
      --  Address the input/output bottleneck. Our solutions are designed to
          deliver gigabit transfer rates and any-to-any connectivity, addressing
          the storage-to-server and server-to-server bottleneck.
 
      --  Provide scalability to SANs. Our switches can be used to incrementally
          increase the size and scope of the SAN, enabling companies to grow
          clusters of high performance storage systems and servers. Connecting
          in a meshed topology, or cascading, multiple SilkWorm switches enable
          companies to interconnect separate SAN clusters into one large SAN to
          share distributed data.
 
      --  Support a mission-critical data processing center. We have designed
          our solutions to provide high levels of resiliency and availability
          with maximum up-time for business-critical applications.
 
      --  Enable SAN applications. Our products provide a network infrastructure
          that allows our customers and partners to address compelling data
          requirements by running multiple new data-intensive applications
          concurrently on the SAN, including data backup and restore, and
          disaster recovery.
 
      --  Enhance SAN management. Our Brocade Fabric is designed for ease of use
          and implementation to reduce the overall costs and improve the
          efficiency of managing SANs.
 
     We intend to capitalize on our SAN switching market leadership and our
Fibre Channel technology leadership to leverage our core technologies and
products to address the evolving SAN market. In addition to focusing on our
distribution relationships with leading storage systems and server original
equipment manufacturers, we have recently launched our system integrator
program. Furthermore, we intend to continue building relationships with leading
technology partners.
                                        3
<PAGE>   5
 
   
                                  THE OFFERING
    
 
Common stock offered................     3,250,000 shares
 
   
Common stock to be outstanding after
this offering.......................     25,685,291 shares
    
 
Use of proceeds.....................     We intend to use the net proceeds for
                                         general corporate purposes, including
                                         repayment of outstanding indebtedness,
                                         capital expenditures and working
                                         capital.
 
Proposed Nasdaq National Market
symbol..............................     BRCD
 
   
     The foregoing information is as of April 30, 1999 and excludes 2,427,397
shares of common stock issuable upon exercise of options outstanding as of April
30, 1999 with a weighted average exercise price of $2.65 per share, 287,788
shares of common stock issuable upon exercise of warrants outstanding as of
April 30, 1999 with a weighted average exercise price of $1.37 per share, and
348,080 shares of common stock reserved for additional option grants under our
stock plans as of April 30, 1999, and assumes no exercise of the underwriters'
over-allotment option.
    
 
     We are a California corporation and will reincorporate in Delaware prior to
the consummation of this offering. Our principal executive offices are located
at 1901 Guadalupe Parkway, San Jose, California 95131, and our telephone number
is (408) 487-8000.
 
   
                             SUMMARY FINANCIAL DATA
    
                     (in thousands, except per share data)
 
   
<TABLE>
<CAPTION>
                                                                                        SIX MONTHS
                                                                                           ENDED
                                                    YEAR ENDED OCTOBER 31,               APRIL 30,
                                             -------------------------------------   -----------------
                                             1995     1996       1997       1998      1998      1999
                                             -----   -------   --------   --------   -------   -------
                                                                                        (UNAUDITED)
<S>                                          <C>     <C>       <C>        <C>        <C>       <C>
STATEMENT OF OPERATIONS DATA:
Total revenues.............................  $  --   $    --   $  8,482   $ 24,246   $14,270   $18,547
Gross profit...............................     --        --      1,800      8,487     5,901     9,789
Loss from operations.......................   (176)   (3,818)    (9,442)   (15,231)   (4,033)   (2,723)
Net loss...................................   (166)   (3,934)    (9,619)   (15,111)   (3,870)   (2,687)
Pro forma basic net loss per share.........                               $   (.84)            $  (.14)
Shares used in per share calculations......                                 17,915              19,193
</TABLE>
    
 
   
     The following table presents summary balance sheet data as of April 30,
1999, which has been adjusted to reflect the assumed exercise of warrants to
purchase 73,699 shares of preferred stock at an exercise price of $6.78 per
share prior to this offering and the subsequent conversion of our preferred
stock into 14,623,614 shares of common stock upon completion of this offering,
our sale of 3,250,000 shares of our common stock in this offering at an assumed
initial public offering price of $9.00 per share and after deducting estimated
underwriting discounts and commissions and our estimated offering expenses, and
the application of the estimated net proceeds. See "Use of Proceeds" and
"Capitalization."
    
 
   
<TABLE>
<CAPTION>
                                                               AS OF APRIL 30, 1999
                                                              -----------------------
                                                               ACTUAL     AS ADJUSTED
                                                              --------    -----------
                                                                    (UNAUDITED)
<S>                                                           <C>         <C>
BALANCE SHEET DATA:
Cash and cash equivalents...................................  $  8,668      $31,689
Working capital.............................................     5,061       30,596
Total assets................................................    27,450       50,471
Long-term portion of debt and capital lease obligations.....     1,525          232
Redeemable convertible preferred stock......................    37,016           --
Total stockholders' equity (deficit)........................   (28,301)      35,543
</TABLE>
    
 
                                        4
<PAGE>   6
 
                                  RISK FACTORS
 
     This offering and an investment in our common stock involve a high degree
of risk. You should carefully consider the following risk factors and the other
information in this prospectus before investing in our common stock. Our
business, financial condition and results of operations could be seriously
harmed by any of the following risks. The trading price of our common stock
could decline due to any of these risks and you may lose all or part of your
investment.
 
   
WE HAVE AN ACCUMULATED DEFICIT OF $31.5 MILLION AND MAY NOT ACHIEVE
PROFITABILITY
    
 
   
     We have incurred significant losses since inception and expect to incur
losses in the future. As of April 30, 1999, we had an accumulated deficit of
$31.5 million. Although our revenues have grown in recent quarters, we cannot be
certain that we will be able to sustain these growth rates or that we will
realize sufficient revenues to achieve profitability. We also expect to incur
significant product development, sales and marketing and administrative expenses
and, as a result, we will need to generate significant revenues to achieve and
maintain profitability. Moreover, even if we do achieve profitability, we may
not be able to sustain or increase profitability. See "Selected Financial Data"
and "Management's Discussion and Analysis of Financial Condition and Results of
Operations."
    
 
     We also may incur additional losses as a result of our limited operating
history. Specifically, Brocade has been operating less than four years.
Therefore, we cannot forecast future operating results based on our historical
results. We plan our operating expenses based in part on future revenue
projections. Our ability to accurately forecast our quarterly revenue is limited
for the reasons discussed below in "-- We Expect Our Quarterly Revenues and
Operating Results to Fluctuate for a Number of Reasons Which Could Cause Our
Stock Price to Fluctuate." Moreover, most of our expenses are fixed in the
short-term or incurred in advance of receipt of corresponding revenue. As a
result, we may not be able to decrease our spending to offset any unexpected
shortfall in our revenues. If this were to occur, we would expect to incur
significant losses.
 
WE EXPECT OUR QUARTERLY REVENUES AND OPERATING RESULTS TO FLUCTUATE FOR A NUMBER
OF REASONS WHICH COULD CAUSE OUR STOCK PRICE TO FLUCTUATE
 
     Our quarterly revenues and operating results have varied significantly in
the past and are likely to vary significantly in the future due to a number of
factors, any of which may cause our stock price to fluctuate. The primary
factors that may affect us include the following:
 
      --  fluctuations in demand for our SilkWorm family of products and
          services;
 
      --  the timing of customer orders and product implementations,
          particularly large orders from and product implementations of our
          original equipment manufacturer customers;
 
      --  our ability to develop, introduce, ship and support new products and
          product enhancements;
 
      --  announcements and new product introductions by our competitors;
 
      --  the expected decline in the prices at which we can sell our SilkWorm
          family of products to our customers;
 
      --  our ability to obtain sufficient supplies of sole or limited sourced
          components, including application specific integrated circuits, or
          ASICs, gigabit interface converters, or GBICs, and power supplies, for
          our SilkWorm family of products;
 
      --  increases in the prices of the components we purchase;
 
                                        5
<PAGE>   7
 
      --  our ability to attain and maintain production volumes and quality
          levels for our SilkWorm family of products;
 
      --  the mix of our SilkWorm and SilkWorm Express switches sold and the mix
          of distribution channels through which they are sold;
 
      --  increased expenses, particularly in connection with our strategy to
          continue to expand our relationships with key original equipment
          manufacturers and system integrators;
 
      --  widespread adoption of SANs as an alternative to existing data storage
          and management systems;
 
      --  decisions by end-users to reallocate their information resources to
          other purposes, including year 2000 preparedness; and
 
      --  deferrals of customer orders in anticipation of new products, services
          or product enhancements introduced by us or our competitors.
 
     Accordingly, you should not rely on the results of any past periods as an
indication of our future performance. It is likely that in some future period,
our operating results may be below expectations of public market analysts or
investors. If this occurs, our stock price may drop.
 
OUR SUCCESS IS DEPENDENT UPON THE DEVELOPMENT OF THE EMERGING MARKET FOR SANS
AND SAN SWITCHING PRODUCTS
 
     Our SilkWorm family of Fibre Channel switching products is used exclusively
in storage area networks, or SANs. Accordingly, widespread adoption of SANs as
an integral part of data-intensive enterprise computing environments is critical
to our future success. In addition, our success depends upon market acceptance
of our SAN switching solutions as an alternative to the use of hubs or other
interconnect devices in SANs. The markets for SANs and SAN switching products
have only recently begun to develop and are rapidly evolving. Because these
markets are new, it is difficult to predict their potential size or future
growth rate. In addition, SANs are often implemented in connection with
deployment of new storage systems and servers and we are therefore dependent to
some extent on this market. Potential end-user customers who have invested
substantial resources in their existing data storage and management systems may
be reluctant or slow to adopt a new approach, like SANs. Our success in
generating revenue in these emerging markets will depend, among other things, on
our ability to educate potential original equipment manufacturers and system
integrator customers, as well as potential end-users, about the benefits of SANs
and SAN switching technology and our ability to maintain and enhance our
relationships with leading original equipment manufacturers and system
integrators. In addition, our products are designed to conform to the Fibre
Channel interconnect protocol and certain other industry standards. Some of
these standards may not be widely adopted, and competing standards may emerge
that will be preferred by original equipment manufacturers or end-users.
 
WE CURRENTLY ONLY OFFER OUR SILKWORM PRODUCT FAMILY AND MUST DEVELOP NEW AND
ENHANCED PRODUCTS THAT ACHIEVE WIDESPREAD MARKET ACCEPTANCE
 
   
     In fiscal 1998 and the six months ended April 30, 1999, we derived 92% of
our revenues from sales of our SilkWorm family of products and the remainder
from a technology license. We expect that revenue from this product family will
continue to account for a substantial portion of our revenues for the
foreseeable future. Therefore, widespread market acceptance of these products is
critical to our future success. Some of our products have been only recently
introduced and therefore, the demand and market acceptance of our products is
uncertain. Factors that may affect the market acceptance of our products include
market acceptance of SAN switching products, the performance, price and total
cost of
    
 
                                        6
<PAGE>   8
 
ownership of our products, the availability and price of competing products and
technologies, and the success and development of our original equipment
manufacturers and system integrators. Many of these factors are beyond our
control.
 
     Our future success depends upon our ability to address the rapidly changing
needs of our customers by developing and introducing high-quality,
cost-effective products, product enhancements and services on a timely basis and
by keeping pace with technological developments and emerging industry standards.
We have new product launches and upgrades to our existing products planned for
1999. Our future revenue growth will be dependent on the success of these new
product launches. We have in the past experienced delays in product development
and such delays may occur in the future. In addition, as we introduce new or
enhanced products, we will have to manage successfully the transition from older
products in order to minimize disruption in our customers' ordering patterns,
avoid excessive levels of older product inventories and ensure that enough
supplies of new products can be delivered to meet our customers' demands. Our
failure to develop and introduce successfully new products and product
enhancements, which are not broadly accepted, would reduce our revenues.
 
WE DEPEND ON A FEW KEY ORIGINAL EQUIPMENT MANUFACTURER CUSTOMERS AND THE LOSS OF
ANY OF THEM COULD SIGNIFICANTLY REDUCE OUR REVENUES
 
   
     We depend on a few key original equipment manufacturer customers. For
example, in the six months ended April 30, 1999, sales to Sequent, McDATA and
Data General accounted for 31%, 25% and 15% of our total revenues, respectively.
We anticipate that our operating results will continue to depend on sales to a
relatively small number of original equipment manufacturers. Therefore, the loss
of any of our key original equipment manufacturers, or a significant reduction
in sales to these original equipment manufacturers could significantly reduce
our revenues.
    
 
FAILURE TO EXPAND OUR DISTRIBUTION CHANNELS AND MANAGE OUR DISTRIBUTION
RELATIONSHIPS COULD SIGNIFICANTLY REDUCE OUR REVENUES
 
     Our success will depend on our continuing ability to develop and manage
relationships with significant original equipment manufacturers and system
integrators, as well as on the sales efforts and success of these customers. Our
customers may evaluate our products for up to a year before they begin to market
and sell them and assisting these customers through the evaluation process may
require significant sales and marketing and management efforts on our part,
particularly if we have to qualify our products with multiple customers at the
same time. In addition, once our products have been qualified, our agreements
with our customers have no minimum purchase commitments. We cannot assure you
that we will be able to expand our distribution channels, manage our
distribution relationships successfully or that our customers will market our
products effectively. Our failure to manage successfully our distribution
relationships or the failure of our customers to sell our products could reduce
our revenues.
 
THE LOSS OF SOLECTRON CORPORATION, OUR SOLE MANUFACTURER, OR THE FAILURE TO
FORECAST ACCURATELY DEMAND FOR OUR PRODUCTS OR MANAGE SUCCESSFULLY OUR
RELATIONSHIP WITH SOLECTRON, WOULD NEGATIVELY IMPACT OUR ABILITY TO MANUFACTURE
AND SELL OUR PRODUCTS
 
     Solectron, a third party manufacturer for numerous companies, manufactures
all of our products at its Milpitas, California facility on a purchase order
basis. We currently do not have a long-term supply contract with Solectron.
Therefore, Solectron is not obligated to supply products to us for any specific
period, or in any specific quantity, except as may be provided in a particular
purchase order. We generally place orders with Solectron up to four months prior
to scheduled delivery of products to our customers. Accordingly, if we
inaccurately forecast demand for our products, we may be unable to obtain
adequate
                                        7
<PAGE>   9
 
manufacturing capacity from Solectron to meet our customers' delivery
requirements or we may accumulate excess inventories.
 
     We plan to regularly introduce new products and product enhancements, which
will require that we coordinate our efforts with those of our suppliers and
Solectron to rapidly achieve volume production. While we have not, to date,
experienced supply problems with Solectron, we have experienced delays in
product deliveries from one of our former contract manufacturers. If we should
fail to effectively manage our relationships with our suppliers and Solectron,
or if Solectron experiences delays, disruptions, capacity constraints or quality
control problems in its manufacturing operations, our ability to ship products
to our customers could be delayed and our competitive position and reputation
could be harmed. Qualifying a new contract manufacturer and commencing volume
production is expensive and time consuming. If we are required or choose to
change contract manufacturers, we may lose revenue and damage our customer
relationships.
 
WE ARE DEPENDENT ON SOLE SOURCE AND LIMITED SOURCE SUPPLIERS FOR CERTAIN KEY
COMPONENTS INCLUDING ASICS AND POWER SUPPLIES
 
   
     We currently purchase several key components from single or limited
sources. We purchase ASICs and power supplies from single sources, and printed
circuit boards and GBICs from limited sources. If we are unable to buy these
components on a timely basis, we will not be able to manufacture our products.
We use a rolling six-month forecast based on anticipated product orders to
determine our component requirements. If we overestimate our component
requirements, we may have excess inventory, which would increase our costs. If
we underestimate our component requirements, we may have inadequate inventory,
which could interrupt our manufacturing. In addition, lead times for materials
and components we order vary significantly and depend on factors such as the
specific supplier, contract terms and demand for a component at a given time. We
also may experience shortages of certain components from time to time, which
also could delay our manufacturing.
    
 
THE COMPETITION IN OUR MARKETS MAY LEAD TO REDUCED SALES OF OUR PRODUCTS,
REDUCED PROFITS AND REDUCED MARKET SHARE
 
     The markets for our SAN switching products are competitive, and are likely
to become even more competitive. Increased competition could result in pricing
pressures, reduced sales, reduced margins, reduced profits, reduced market share
or the failure of our products to achieve or maintain market acceptance. Our
products face competition from multiple sources. Some of our competitors and
potential competitors have longer operating histories, greater name recognition,
access to larger customer bases, or substantially greater resources than we
have. As a result, they may be able to respond more quickly than we can to new
or changing opportunities, technologies, standards or customer requirements. For
all of the foregoing reasons, we may not be able to compete successfully against
our current and future competitors. See "Business -- Competition."
 
THE PRICES OF OUR PRODUCTS ARE DECLINING WHICH COULD REDUCE OUR REVENUES AND
GROSS MARGINS
 
     The average unit price of our products decreased 26% in fiscal 1998. We
anticipate that the average unit price of our products may continue to decrease
in the future in response to changes in product mix, competitive pricing
pressures, increased sales discounts, new product introductions by us or our
competitors or other factors. If we are unable to offset these factors by
increasing our sales volumes, our revenues will decline. In addition, to
maintain our gross margins, we must develop and introduce new products and
product enhancements, and we must continue to reduce the manufacturing cost of
our products.
 
                                        8
<PAGE>   10
 
UNDETECTED SOFTWARE OR HARDWARE ERRORS COULD INCREASE OUR COSTS AND REDUCE OUR
REVENUES
 
     Networking products frequently contain undetected software or hardware
errors when first introduced or as new versions are released. Our products are
complex and errors may be found from time to time in our new or enhanced
products. In addition, our products are combined with products from other
vendors. As a result, when problems occur, it may be difficult to identify the
source of the problem. These problems may cause us to incur significant warranty
and repair costs, divert the attention of our engineering personnel from our
product development efforts and cause significant customer relations problems.
Moreover, the occurrence of hardware and software errors, whether caused by our
or another vendor's SAN products, could delay or prevent the development of the
SAN market.
 
IF WE LOSE KEY PERSONNEL OR ARE UNABLE TO HIRE ADDITIONAL QUALIFIED PERSONNEL,
WE MAY NOT BE SUCCESSFUL
 
     Our success depends to a significant degree upon the continued
contributions of our key management, engineering and sales and marketing
personnel, many of whom would be difficult to replace. In particular, we believe
that our future success is highly dependent on Gregory L. Reyes, our President
and Chief Executive Officer, Kumar Malavalli, our Vice President, Technology and
Paul R. Bonderson, Jr., our Vice President, Engineering. We do not have
employment contracts with, or key person life insurance on, any of our key
personnel. We also believe that our success depends to a significant extent on
the ability of our management to operate effectively, both individually and as a
group. In April 1999, we hired a new Chief Financial Officer, and certain other
members of our management team, including Mr. Reyes, have only recently joined
us.
 
     We believe our future success will also depend in large part upon our
ability to attract and retain highly skilled managerial, engineering, sales and
marketing, and finance and operations personnel. Competition for these personnel
is intense, especially in the San Francisco Bay Area. In particular, we have
experienced difficulty in hiring qualified ASIC, software, system and test, and
customer support engineers and there can be no assurance that we will be
successful in attracting and retaining these individuals. The loss of the
services of any of our key employees, the inability to attract or retain
qualified personnel in the future or delays in hiring required personnel,
particularly engineers and sales personnel, could delay the development and
introduction of and negatively impact our ability to sell our products. In
addition, companies in our industry whose employees accept positions with
competitors frequently claim that their competitors have engaged in unfair
hiring practices. We cannot assure you that we will not receive such claims in
the future as we seek to hire qualified personnel or that such claims will not
result in material litigation. We could incur substantial costs in defending
ourselves against these claims, regardless of their merits.
 
WE MUST CONTINUE TO IMPROVE OUR OPERATIONAL SYSTEMS AND CONTROLS TO MANAGE
FUTURE GROWTH
 
     We plan to continue to expand our operations significantly to pursue
existing and potential market opportunities. This growth places a significant
demand on our management and our operational resources. In order to manage
growth effectively, we must implement and improve our operational systems,
procedures and controls on a timely basis.
 
WE PLAN TO INCREASE OUR INTERNATIONAL SALES ACTIVITIES SIGNIFICANTLY, WHICH WILL
SUBJECT US TO ADDITIONAL BUSINESS RISKS
 
     We plan to expand our international sales activities significantly. In
fiscal 1999 and 2000, we intend to focus on expanding our international sales
activities in Western Europe. Our international sales growth
 
                                        9
<PAGE>   11
 
in these countries will be limited if we are unable to establish relationships
with international distributors, establish additional foreign operations, expand
international sales channel management, hire additional personnel and develop
relationships with international service providers. Even if we are able to
successfully expand international operations, we cannot be certain that we will
be able to maintain or increase international market demand for our products.
Our international operations, including our sales activities in Western Europe,
are subject to a number of risks, including:
 
      --  supporting multiple languages;
 
      --  recruiting sales and technical support personnel with the skills to
          support our products;
 
      --  increased complexity and costs of managing international operations;
 
      --  protectionist laws and business practices that favor local
          competition;
 
      --  dependence on local vendors;
 
      --  multiple, conflicting and changing governmental laws and regulations;
 
      --  longer sales cycles;
 
      --  difficulties in collecting accounts receivable;
 
      --  reduced or limited protections of intellectual property rights; and
 
      --  political and economic instability.
 
     To date, none of our international revenues and costs have been denominated
in foreign currencies. As a result, an increase in the value of the U.S. dollar
relative to foreign currencies could make our products more expensive and thus
less competitive in foreign markets. A portion of our international revenues may
be denominated in foreign currencies in the future, including the Euro, which
will subject us to risks associated with fluctuations in those foreign
currencies.
 
WE MAY BE UNABLE TO PROTECT OUR INTELLECTUAL PROPERTY WHICH WOULD NEGATIVELY
AFFECT OUR ABILITY TO COMPETE
 
     We rely on a combination of patent, copyright, trademark and trade secret
laws and restrictions on disclosure to protect our intellectual property rights.
We also enter into confidentiality or license agreements with our employees,
consultants and corporate partners, and control access to and distribution of
our software, documentation and other proprietary information. Despite our
efforts to protect our proprietary rights, unauthorized parties may attempt to
copy or otherwise obtain and use our products or technology. Monitoring
unauthorized use of our products is difficult, and we cannot be certain that the
steps we have taken will prevent unauthorized use of our technology,
particularly in foreign countries where the laws may not protect our proprietary
rights as fully as in the United States. See "Business -- Intellectual
Property."
 
OTHERS MAY BRING INFRINGEMENT CLAIMS AGAINST US WHICH COULD BE TIME-CONSUMING
AND EXPENSIVE TO DEFEND
 
     In recent years, there has been significant litigation in the United States
involving patents and other intellectual property rights. We were previously the
subject of a lawsuit alleging infringement of intellectual property rights.
Although this dispute was resolved and the lawsuit dismissed, and we are not
currently involved in any other intellectual property litigation, we may be a
party to litigation in the future to protect our intellectual property or as a
result of an alleged infringement of others' intellectual
 
                                       10
<PAGE>   12
 
property. These claims and any resulting lawsuit could subject us to significant
liability for damages and invalidation of our proprietary rights. These
lawsuits, regardless of their success, would likely be time-consuming and
expensive to resolve and would divert management time and attention. Any
potential intellectual property litigation also could force us to do one or more
of the following:
 
      --  stop selling, incorporating or using our products or services that use
          the challenged intellectual property;
 
      --  obtain from the owner of the infringed intellectual property right a
          license to sell or use the relevant technology, which license may not
          be available on reasonable terms, or at all; and
 
      --  redesign those products or services that use such technology.
 
     If we are forced to take any of the foregoing actions, we may be unable to
manufacture and sell our products, which would reduce our revenues.
 
WE ARE THE SUBJECT OF A PENDING LEGAL PROCEEDING
 
     We have been sued by one of our former contract manufacturers in the Santa
Clara County, California Superior Court. We believe that we have strong defenses
against the claims alleged in the lawsuit. Accordingly, we intend to defend this
suit vigorously. However, the litigation process is inherently uncertain and we
may not prevail. Our defense of this litigation, regardless of its eventual
outcome, has been, and will likely continue to be, time-consuming, costly and a
diversion for our personnel. A failure to prevail could result in us having to
pay monetary damages of up to $2.9 million and reimburse the plaintiff for some
or all of its attorneys' fees. See "Business -- Pending Legal Proceeding."
 
WE MAY ENGAGE IN FUTURE ACQUISITIONS THAT DILUTE OUR STOCKHOLDERS AND CAUSE US
TO INCUR DEBT OR ASSUME CONTINGENT LIABILITIES
 
     As part of our strategy, we expect to review opportunities to buy other
businesses or technologies that would complement our current products, expand
the breadth of our markets or enhance our technical capabilities, or that may
otherwise offer growth opportunities. While we have no current agreements or
negotiations underway, we may buy businesses, products or technologies in the
future. In the event of any future purchases, we could:
 
      --  issue stock that would dilute our current stockholders' percentage
          ownership;
 
      --  incur debt; or
 
      --  assume liabilities.
 
These purchases also involve numerous risks, including:
 
      --  problems combining the purchased operations, technologies or products;
 
      --  unanticipated costs;
 
      --  diversion of management's attention from our core business;
 
      --  adverse effects on existing business relationships with suppliers and
          customers;
 
      --  risks associated with entering markets in which we have no or limited
          prior experience; and
 
      --  potential loss of key employees of purchased organizations.
 
                                       11
<PAGE>   13
 
     We cannot assure you that we will be able to successfully integrate any
businesses, products, technologies or personnel that we might purchase in the
future.
 
OUR FAILURE AND THE FAILURE OF OUR SUPPLIERS AND CUSTOMERS TO BE YEAR 2000
COMPLIANT COULD HARM OUR BUSINESS
 
     The year 2000 computer issue creates risks for us. Failure of our products
to recognize correctly date information when the year changes to 2000 could
result in significant decreases in market acceptance of our products, increases
in warranty claims and legal liability for defective software. We have not
tested our products in every possible computer environment, and therefore such
products may not be fully year 2000 compliant. Year 2000 preparations by our
customers could also slow down purchases of our products.
 
     Our internal year 2000 compliance review is focused on reviewing our
internal computer information and security systems for year 2000 compliance, and
developing and implementing remedial programs to resolve year 2000 issues in a
timely manner. Additionally, we are contacting our third party suppliers and
requesting their written assurances that their systems are year 2000 compliant.
To date our year 2000 costs have been primarily driven by the cost of our
personnel conducting the year 2000 compliance review. We estimate such costs to
date are $50,000.
 
     If our suppliers, vendors, major distributors and partners fail to correct
their year 2000 problems, these failures could result in an interruption in, or
a failure of, our normal business activities or operations. If a year 2000
problem occurs, it may be difficult to determine which vendor's products have
caused the problem. These failures could interrupt our operations and damage our
relationships with our customers. Due to the general uncertainty inherent in the
year 2000 problem resulting from the readiness of third-party suppliers and
vendors, we are unable to determine at this time whether any year 2000 failures
will harm us.
 
     We believe our year 2000 worst case scenario would be the failure of a sole
or limited source supplier to be year 2000 compliant. The failure of one of
these suppliers to be year 2000 compliant could seriously interrupt our
manufacturing process, which could substantially reduce our revenues.
 
     Our customers' purchasing plans could be affected by year 2000 issues if
they need to expend significant resources to fix their existing systems. This
situation may reduce funds available to purchase our products. Therefore, some
customers may wait to purchase our products until after the year 2000, which may
reduce our revenue. See "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- Year 2000 Compliance."
 
OUR PRODUCTS MUST COMPLY WITH EVOLVING INDUSTRY STANDARDS AND GOVERNMENT
REGULATIONS
 
     The market for SAN products is characterized by the need to support
industry standards as they emerge, evolve and achieve acceptance. To remain
competitive, we must continue to introduce new products and product enhancements
that meet these industry standards. All components of the SAN must utilize the
same standards in order to operate together. Our products comprise only a part
of the entire SAN and we depend on the companies that provide other components
of the SAN, many of whom are significantly larger than we are, to support the
industry standards as they evolve. The failure of these providers to support
these industry standards could adversely affect the market acceptance of our
products. In addition, in the United States, our products must comply with
various regulations and standards defined by the Federal Communications
Commission and Underwriters Laboratories. Internationally, products that we
develop will also be required to comply with standards established by
authorities in various countries. Failure to comply with existing or evolving
industry standards or to obtain timely domestic or foreign regulatory approvals
or certificates could materially harm our business.
 
                                       12
<PAGE>   14
 
MANAGEMENT CAN SPEND THE PROCEEDS OF THIS OFFERING IN WAYS WITH WHICH THE
STOCKHOLDERS MAY NOT AGREE
 
     Our management can spend the net proceeds from this offering in ways with
which the stockholders may not agree. We cannot assure you that our investments
and use of the net proceeds of this offering will yield favorable returns or
results. See "Use of Proceeds."
 
OUR OFFICERS AND DIRECTORS AND THEIR AFFILIATES WILL EXERCISE SIGNIFICANT
CONTROL OVER BROCADE
 
   
     Upon completion of this offering, our executive officers and directors and
their affiliates will beneficially own, in the aggregate, approximately 50.1% of
our outstanding common stock. As a result, these stockholders will be able to
exercise significant control over all matters requiring stockholder approval,
including the election of directors and approval of significant corporate
transactions, which could delay or prevent someone from acquiring or merging
with us. See "Principal Stockholders."
    
 
PROVISIONS IN OUR CHARTER DOCUMENTS, CUSTOMER AGREEMENTS AND DELAWARE LAW COULD
PREVENT OR DELAY A CHANGE IN CONTROL OF BROCADE AND MAY REDUCE THE MARKET PRICE
OF OUR COMMON STOCK
 
     Provisions of our certificate of incorporation and bylaws may discourage,
delay or prevent a merger or acquisition that a stockholder may consider
favorable. These provisions include:
 
      --  authorizing the issuance of preferred stock without stockholder
          approval;
 
      --  providing for a classified board of directors with staggered,
          three-year terms;
 
      --  prohibiting cumulative voting in the election of directors;
 
      --  requiring super-majority voting to effect certain amendments to our
          certificate of incorporation and bylaws;
 
   
      --  limiting the persons who may call special meetings of stockholders;
          and
    
 
   
      --  prohibiting stockholder actions by written consent.
    
 
     Certain provisions of Delaware law also may discourage, delay or prevent
someone from acquiring or merging with us. Further, our agreements with certain
of our customers require us to give prior notice of a change of control of
Brocade and grant certain manufacturing rights following the change of control.
See "Description of Capital Stock -- Preferred Stock" and "-- Delaware Law and
Certain Provisions of Our Certificate of Incorporation and Bylaws."
 
OUR STOCK PRICE MAY BE VOLATILE AND YOU MAY NOT BE ABLE TO RESELL YOUR SHARES AT
OR ABOVE THE INITIAL PUBLIC OFFERING PRICE
 
     There has been no public market for our common stock prior to this
offering. The initial public offering price for our common stock will be
determined through negotiations between the underwriters and us. This initial
public offering price may vary from the market price of our common stock after
the offering. If you purchase shares of common stock, you may not be able to
resell those shares at or above the initial public offering price. The market
price of our common stock may fluctuate significantly in response to the
following factors, some of which are beyond our control:
 
      --  actual or anticipated fluctuations in our operating results;
 
      --  changes in financial estimates by securities analysts;
 
                                       13
<PAGE>   15
 
      --  changes in market valuations of other technology companies;
 
      --  announcements by us or our competitors of significant technical
          innovations, contracts, acquisitions, strategic partnerships, joint
          ventures or capital commitments;
 
      --  losses of major original equipment manufacturer customers;
 
      --  additions or departures of key personnel; and
 
      --  sales of common stock in the future.
 
     In addition, the stock market has experienced extreme volatility that often
has been unrelated to the performance of particular companies. These market
fluctuations may cause our stock price to fall regardless of our performance.
 
     You should read the "Underwriters" section for a more complete discussion
of the factors to be considered in determining the initial public offering price
of our common stock.
 
OUR BUSINESS MAY BE HARMED BY CLASS ACTION LITIGATION DUE TO STOCK PRICE
VOLATILITY
 
     In the past, securities class action litigation often has been brought
against a company following periods of volatility in the market price of its
securities. We may in the future be the target of similar litigation. Securities
litigation could result in substantial costs and divert management's attention
and resources.
 
WE MAY BE UNABLE TO MEET OUR FUTURE CAPITAL REQUIREMENTS WHICH WOULD LIMIT OUR
ABILITY TO GROW
 
     We believe that the net proceeds of this offering, together with our
existing cash balances, credit facilities and cash flow expected to be generated
from future operations, will be sufficient to meet our capital requirements at
least through the next 12 months. However, we may need, or could elect, to seek
additional funding prior to that time. In the event we need to raise additional
funds we may not be able to do so on favorable terms, if at all. Further, if we
issue equity securities, stockholders may experience additional dilution or the
new equity securities may have rights, preferences or privileges senior to those
of existing holders of common stock. If we cannot raise funds on acceptable
terms, we may not be able to develop or enhance our products, take advantage of
future opportunities or respond to competitive pressures or unanticipated
requirements. See "Use of Proceeds," "Dilution" and "Management's Discussion and
Analysis of Financial Condition and Results of Operations -- Liquidity and
Capital Resources."
 
SUBSTANTIAL FUTURE SALES OF OUR COMMON STOCK IN THE PUBLIC MARKET MAY DEPRESS
OUR STOCK PRICE
 
   
     Our current stockholders hold a substantial number of shares, which they
will be able to sell in the public market in the near future. All of the
3,250,000 shares sold in this offering will be freely tradeable, with the
22,435,291 other shares outstanding, based on the number of shares outstanding
as of April 30, 1999, being restricted securities as defined in Rule 144 of the
Securities Act of 1933, approximately 10,949,935 shares of which will be freely
tradeable beginning 180 days after the effective date of this offering, and the
remainder of which will become freely tradeable at various times thereafter.
Sales of a substantial number of shares of our common stock after this offering
could cause our stock price to fall. In addition, the sale of these shares could
impair our ability to raise capital through the sale of additional stock. See
"Shares Eligible for Future Sale."
    
 
                                       14
<PAGE>   16
 
YOU WILL EXPERIENCE IMMEDIATE AND SUBSTANTIAL DILUTION
 
   
     The initial public offering price is expected to be substantially higher
than the book value per share of our outstanding common stock immediately after
the offering. Accordingly, if you purchase common stock in the offering, you
will incur immediate dilution of approximately $7.62 in the book value per share
of our common stock from the price you pay for our common stock. This
calculation assumes that you purchase our common stock for $9.00 per share. See
"Dilution."
    
 
               SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS
 
     This prospectus contains forward-looking statements that relate to future
events or our future financial performance. In some cases, you can identify
forward-looking statements by terminology such as "may," "will," "should,"
"expects," "plans," "anticipates," "believes," "estimates," "predicts,"
"intend," "potential" or "continue" or the negative of such terms or other
comparable terminology. These statements are only predictions. Although we
believe that the expectations reflected in the forward-looking statements are
reasonable, we cannot guarantee future results, levels of activity, performance
or achievements. Our actual results could differ materially from those
anticipated in these forward-looking statements as a result of various factors,
including the risks outlined under "Risk Factors" and elsewhere in this
prospectus.
 
                                       15
<PAGE>   17
 
                                USE OF PROCEEDS
 
   
     We estimate that our net proceeds from the sale of the 3,250,000 shares of
common stock we are offering will be approximately $26,327,500, or $30,407,875
if the underwriters exercise their over-allotment option in full, at an assumed
initial public offering price of $9.00 per share and after deducting estimated
underwriting discounts and commissions and our estimated offering expenses. We
expect to use the net proceeds of this offering as follows:
    
 
      --  to repay outstanding indebtedness under our bank credit facility and
          our equipment loan agreement; and
 
      --  for general corporate purposes, including capital expenditures and
          working capital.
 
     In addition, we may use a portion of the net proceeds for the acquisition
of businesses, products and technologies that are complementary to ours.
However, we have no current plans, agreements or commitments and are not
currently engaged in any negotiations with respect to any acquisition. Pending
such uses, we will invest the net proceeds of this offering in investment grade,
interest-bearing securities.
 
   
     Borrowings under our credit facility bear interest at the bank's prime
rate, which was 8.5% per annum as of April 30, 1999, and indebtedness under our
equipment loan agreement bears interest at the bank's prime rate plus 1%. At
April 30, 1999, the principal amount of outstanding indebtedness under our
credit facility and our equipment loan agreement was approximately $1.2 million
and $2.6 million, respectively.
    
 
                                DIVIDEND POLICY
 
     We have not paid any cash dividends since our inception, and we do not
intend to pay any cash dividends in the foreseeable future. In addition, the
terms of our credit agreements prohibit the payment of dividends on our capital
stock.
 
                                       16
<PAGE>   18
 
                                 CAPITALIZATION
 
   
     The following table sets forth our short-term debt and capitalization as of
April 30, 1999:
    
 
      --  on an actual basis;
 
   
      --  on a pro forma basis to reflect the assumed exercise of warrants to
          purchase 73,699 shares of preferred stock at an exercise price of
          $6.78 per share prior to this offering, the subsequent conversion of
          all outstanding shares of preferred stock into 14,623,614 shares of
          common stock and our reincorporation in Delaware; and
    
 
   
      --  on a pro forma as adjusted basis to reflect the sale of the common
          stock in this offering at an assumed initial public offering price of
          $9.00 per share and the application of the net proceeds, after
          deducting estimated underwriting discounts and commissions and our
          estimated offering expenses.
    
 
   
     The outstanding share information excludes 2,427,397 shares of common stock
issuable upon exercise of options outstanding as of April 30, 1999 with a
weighted average exercise price of $2.65 per share, 287,788 shares of common
stock issuable upon exercise of warrants outstanding as of April 30, 1999 with a
weighted average exercise price of $1.37 per share, and 348,080 shares of common
stock reserved for additional option grants under our stock plans as of April
30, 1999. This table should be read in conjunction with "Management's Discussion
and Analysis of Financial Condition and Results of Operations" and the financial
statements and the notes to the financial statements. See "Use of Proceeds" and
"Management -- Employee Benefit Plans."
    
 
   
<TABLE>
<CAPTION>
                                                                    AS OF APRIL 30, 1999
                                                            -------------------------------------
                                                                                      PRO FORMA
                                                             ACTUAL     PRO FORMA    AS ADJUSTED
                                                            ---------   ----------   ------------
                                                            (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                                                         (UNAUDITED)
<S>                                                         <C>         <C>          <C>
Short-term portion of debt and capital lease
  obligations.............................................  $  3,139     $  3,139      $    625
                                                            ========     ========      ========
Long-term portion of debt and capital lease obligations...  $  1,525     $  1,525      $    232
Redeemable convertible preferred stock, no par value,
  9,791,280 shares authorized, 9,458,665 issued and
  outstanding, actual; no shares authorized, issued or
  outstanding, pro forma and pro forma as adjusted........    37,016           --            --
Warrants to purchase redeemable convertible preferred
  stock...................................................       405          405           405
Stockholders' equity (deficit):
  Preferred stock, $.001 par value, no shares authorized,
     issued or outstanding, actual; 5,000,000 shares
     authorized, no shares issued or outstanding, pro
     forma and pro forma as adjusted......................        --           --            --
  Common stock, $.001 par value, 30,000,000 shares
     authorized, 7,811,677 shares issued and outstanding,
     actual; 50,000,000 shares authorized, 22,435,291
     shares issued and outstanding, pro forma; 50,000,000
     shares authorized, 25,685,291 issued and outstanding,
     pro forma as adjusted................................    13,765           22            26
  Additional paid-in capital..............................        --       51,259        77,583
  Notes receivable from stockholders......................    (6,549)      (6,549)       (6,549)
  Deferred stock compensation.............................    (4,000)      (4,000)       (4,000)
  Accumulated deficit.....................................   (31,517)     (31,517)      (31,517)
                                                            --------     --------      --------
     Total stockholders' equity (deficit).................   (28,301)       9,215        35,543
                                                            --------     --------      --------
          Total capitalization............................  $ 10,645     $ 11,145      $ 36,180
                                                            ========     ========      ========
</TABLE>
    
 
                                       17
<PAGE>   19
 
                                    DILUTION
 
   
     The pro forma net tangible book value of our common stock as of April 30,
1999, was approximately $9.2 million, or $.41 per share of common stock. Pro
forma net tangible book value per share represents the amount of our total
tangible assets reduced by the amount of our total liabilities, divided by
22,435,291 shares of common stock outstanding after giving effect to the assumed
exercise of warrants to purchase 73,699 shares of preferred stock at an exercise
price of $6.78 per share prior to this offering and the subsequent conversion of
all outstanding shares of preferred stock into shares of common stock upon
completion of this offering. After giving effect to our sale of 3,250,000 shares
of common stock in this offering at an assumed initial offering price of $9.00
per share and after deducting the estimated underwriting discounts and
commissions and our estimated offering expenses, our net tangible book value as
of April 30, 1999, would have been $35.5 million or $1.38 per share. This
represents an immediate increase in net tangible book value of $.97 per share to
existing stockholders and an immediate dilution in net tangible book value of
$7.62 per share to purchasers of common stock in this offering, as illustrated
in the following table:
    
 
   
<TABLE>
<S>                                                           <C>     <C>
Assumed initial public offering price per share.............          $9.00
  Pro forma net tangible book value per share as of April
     30, 1999...............................................  $.41
  Increase per share attributable to new investors..........   .97
                                                              ----
Pro forma net tangible book value per share after this
  offering..................................................           1.38
                                                                      -----
Dilution per share to new investors.........................          $7.62
                                                                      =====
</TABLE>
    
 
   
     The following table sets forth on a pro forma basis as of April 30, 1999,
after giving effect to the assumed exercise of warrants to purchase 73,699
shares of preferred stock at an exercise price of $6.78 per share prior to this
offering, the subsequent conversion of all outstanding shares of preferred stock
into common stock upon completion of this offering, the differences between the
existing stockholders and the purchasers of shares in this offering, at the
assumed initial public offering price of $9.00 per share, with respect to the
number of shares purchased from us, the total consideration paid and the average
price paid per share:
    
 
   
<TABLE>
<CAPTION>
                                     SHARES PURCHASED       TOTAL CONSIDERATION       AVERAGE
                                    -------------------    ----------------------    PRICE PER
                                      NUMBER    PERCENT      AMOUNT       PERCENT      SHARE
                                    ----------  -------    -----------    -------    ---------
<S>                                 <C>         <C>        <C>            <C>        <C>
Existing stockholders.............  22,435,291      87%    $46,243,000        61%      $2.06
New stockholders..................   3,250,000      13      29,250,000        39        9.00
                                    ----------   -----     -----------     -----
          Total...................  25,685,291     100%    $75,493,000       100%
                                    ==========   =====     ===========     =====
</TABLE>
    
 
   
     As of April 30, 1999, there were options outstanding to purchase a total of
2,427,397 shares of common stock at a weighted average exercise price of $2.65
per share. In addition, as of April 30, 1999, there were warrants outstanding to
purchase 287,788 shares of common stock on an as converted basis at a weighted
average exercise price of approximately $1.37 per share, which we have assumed
will not be exercised prior to this offering. To the extent outstanding options
or warrants are exercised, there will be further dilution to new investors. See
"Management -- Employee Benefit Plans" and notes 6 and 7 to our financial
statements.
    
 
                                       18
<PAGE>   20
 
                            SELECTED FINANCIAL DATA
 
   
    The following selected financial data should be read in conjunction with our
financial statements and related notes, "Management's Discussion and Analysis of
Financial Condition and Results of Operations," and other financial information
appearing elsewhere in this prospectus. The statement of operations data set
forth below for each of the years in the three-year period ended October 31,
1998 and the balance sheet data as of October 31, 1997 and 1998 are derived
from, and qualified by reference to, our audited financial statements appearing
elsewhere in this prospectus. The statement of operations data for the period
from inception on August 24, 1995 to October 31,1995 and the balance sheet data
as of October 31, 1995 and 1996 are derived from audited financial statements
not included herein. The statement of operations data for the six months ended
April 30, 1998 and 1999 and the balance sheet data as of April 30, 1999 are
derived from unaudited financial statements appearing elsewhere in this
prospectus which, in the opinion of our management, reflect all normal recurring
adjustments that we consider necessary for a fair presentation of such
information in accordance with generally accepted accounting principles.
Operating results for the six months ended April 30, 1999 are not necessarily
indicative of the results that may be expected for the full fiscal year.
    
 
   
<TABLE>
<CAPTION>
                                                                                                  SIX MONTHS ENDED
                                                       YEAR ENDED OCTOBER 31,                        APRIL 30,
                                            --------------------------------------------     --------------------------
                                             1995       1996         1997         1998          1998           1999
                                            ------     -------     --------     --------     -----------    -----------
                                                               (IN THOUSANDS, EXCEPT PER SHARE DATA)
                                                                                                    (UNAUDITED)
<S>                                         <C>        <C>         <C>          <C>          <C>            <C>
STATEMENT OF OPERATIONS DATA:
Revenues:
  Product revenue.........................  $   --     $    --     $  8,482     $ 22,414      $ 12,958        $16,969
  License revenue.........................      --          --           --        1,832         1,312          1,578
                                            ------     -------     --------     --------      --------        -------
         Total revenues...................      --          --        8,482       24,246        14,270         18,547
Cost of revenues..........................      --          --        6,682       15,759         8,369          8,758
                                            ------     -------     --------     --------      --------        -------
Gross profit..............................      --          --        1,800        8,487         5,901          9,789
                                            ------     -------     --------     --------      --------        -------
Operating expenses:
  General and administrative..............      52         575        1,464        3,813         1,263          1,415
  Sales and marketing.....................      --         152        2,112        5,154         2,376          4,086
  Research and development................     124       3,091        7,666       14,744         6,295          5,634
  Amortization of deferred compensation...      --          --           --            7            --          1,377
                                            ------     -------     --------     --------      --------        -------
         Total operating expenses.........     176       3,818       11,242       23,718         9,934         12,512
                                            ------     -------     --------     --------      --------        -------
Loss from operations......................    (176)     (3,818)      (9,442)     (15,231)       (4,033)        (2,723)
Other income (expense)....................      10        (116)        (177)         120           163             36
                                            ------     -------     --------     --------      --------        -------
Net loss..................................  $ (166)    $(3,934)    $ (9,619)    $(15,111)     $ (3,870)       $(2,687)
                                            ======     =======     ========     ========      ========        =======
Basic net loss per share..................  $   --     $ (9.50)    $  (4.82)    $  (4.44)     $  (1.35)       $  (.56)
                                            ======     =======     ========     ========      ========        =======
Shares used in computing basic net loss
  per share...............................      --         414        1,997        3,400         2,857          4,757
                                            ======     =======     ========     ========      ========        =======
Pro forma basic net loss per share
  (unaudited).............................                                      $   (.84)                     $  (.14)
                                                                                ========                      =======
Shares used in computing pro forma basic
  net loss per share (unaudited)..........                                        17,915                       19,193
                                                                                ========                      =======
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                                    AS OF OCTOBER 31,                 AS OF
                                                          --------------------------------------    APRIL 30,
                                                           1995     1996       1997       1998        1999
                                                          ------   -------   --------   --------   -----------
                                                                             (IN THOUSANDS)        (UNAUDITED)
<S>                                                       <C>      <C>       <C>        <C>        <C>
BALANCE SHEET DATA:
Cash, cash equivalents and short-term investments.......  $1,168   $   700   $  2,552   $ 10,420    $  8,668
Working capital.........................................     922       104     15,334      5,276       5,061
Total assets............................................   1,549     2,605     26,100     21,301      27,450
Long-term portion of debt and capital lease
  obligations...........................................      --       874      1,954      2,209       1,525
Redeemable convertible preferred stock..................   1,411     4,613     30,359     35,261      37,016
Total stockholders' deficit.............................    (166)   (3,957)   (13,458)   (27,355)    (28,301)
</TABLE>
    
 
                                       19
<PAGE>   21
 
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
     The following discussion should be read in conjunction with the financial
statements and the related notes included elsewhere in this prospectus.
 
OVERVIEW
 
     We are a provider of switching solutions for SANs. We sell our SAN
switching solutions through leading storage systems and server original
equipment manufacturers, including Compaq Computer, Dell Computer, McDATA
Corporation, Sequent Computer Systems and StorageTek. These original equipment
manufacturers and our system integrator customers combine our switching
solutions with other system elements and services for enterprise data centers.
 
   
     From our inception in August 1995 through April 1997, our operating
activities related primarily to developing our research and development
capabilities, building an ASIC design infrastructure, developing, prototyping
and testing our SilkWorm products, staffing our administrative, marketing and
sales organizations and establishing relationships with original equipment
manufacturers. In the three months ended July 31, 1997, we commenced volume
shipments of our SilkWorm switch. Since our inception we have incurred
significant losses and as of April 30, 1999, we had an accumulated deficit of
$31.5 million.
    
 
   
     Our revenue is derived primarily from sales of our SilkWorm family of
products. Additionally, we have recognized licensing revenue in connection with
the licensing of certain technology rights to a customer. In fiscal 1998, sales
to Sequent and McDATA accounted for 72% and 11% of our total revenues,
respectively, and in the six months ended April 30, 1999, Sequent, McDATA and
Data General accounted for 31%, 25% and 15% of our total revenues, respectively.
These percentages exclude deferred revenue, which is discussed further below.
The level of sales to any customer may vary from quarter to quarter. However, we
expect that significant customer concentration will continue for the foreseeable
future.
    
 
   
     We currently sell substantially all of our products through several major
original equipment manufacturers. The initial evaluation and product
qualification cycle with original equipment manufacturers typically takes six to
twelve months and includes technical evaluation, integration, testing, product
launch planning and execution. Our sales strategy also includes recruiting
system integrators with a Fortune 500 data center presence and the technical
resources to design, implement and support SANs. To date, substantially all of
our sales have been in the United States. However, we have launched sales and
marketing efforts in Western Europe and have a distributor in Japan.
    
 
   
     Product revenue is recognized when products are shipped to customers,
unless at the time of shipment product returns cannot be estimated or
significant support services are required to successfully launch the customer's
products. In the six months ended April 30, 1999, several of our customers were
implementing SAN solutions, including our product, for their end-users for the
first time. Given the recent adoption of the SAN model and Brocade's solution by
these original equipment manufacturers and because substantial Brocade services
were required to support these original equipment manufacturers' product
launches, the revenue related to shipments to these original equipment
manufacturers customers has been deferred. The deferred revenue will be
recognized on a customer-by-customer basis as each customer successfully
completes its product launch. Similarly, revenue is deferred for new products
that have not completed the beta test phase. As of April 30, 1999, $3.9 million
of revenue was deferred. It is expected that this deferred revenue will be
recognized in the second half of fiscal 1999. We believe that, as the SAN market
matures, this revenue deferral method for new customers may not be necessary. We
do not provide our customers with product return programs. We provide a reserve
for warranty returns based on our warranty history. License revenue is related
only to technology associated
    
 
                                       20
<PAGE>   22
 
   
with certain ASICs and is recognized when designs and specifications are
delivered and collection is reasonably assured. We do not anticipate significant
technology licensing revenues in the future.
    
 
     From fiscal 1997 to fiscal 1998 our average unit selling price decreased
26.0% primarily due to the introduction of the SilkWorm Express, a lower port
count product. We expect continued declines in our average unit selling price
due to anticipated increases in per customer sales volume, the impact of
competitive pricing pressures and new product introductions.
 
   
     Our gross margins may be affected by declines in average unit selling
prices, fluctuations in manufacturing volumes and component costs, the mix of
products sold and the introduction of new products. Additionally, our gross
margins may be impacted by the mix of distribution channels through which our
products are sold.
    
 
     In July 1998, we outsourced our manufacturing and the majority of our
supply chain management operations. Accordingly, a significant portion of our
cost of revenues consists of payments to our contract manufacturer, Solectron.
We conduct quality assurance, manufacturing engineering, documentation control
and repairs at our facility in San Jose, California.
 
     General and administrative expenses consist primarily of salaries and
related expenses for executive, finance and human resources personnel,
recruiting expenses, professional fees and other corporate expenses. We expect
general and administrative expenses to increase in absolute dollars as we add
personnel and incur additional costs related to the growth of our business and
our operation as a public company.
 
     Selling and marketing expenses consist primarily of salaries, commissions
and related expenses for personnel engaged in marketing, sales and customer
engineering support functions, as well as costs associated with promotional and
travel expenses. We believe that continued investment in sales and marketing is
critical to the success of our strategy to expand our relationships with leading
original equipment manufacturers and to maintaining our leadership position in
the SAN market. As a result, we expect these expenses to increase in absolute
dollars in the future.
 
     Research and development expenses consist primarily of salaries and related
personnel expenses, fees paid to consultants and outside service providers,
prototyping expenses related to the design, development, testing and
enhancements of our ASICs and software and the costs of computer support
services. We believe that continued investment in research and development is
critical to our strategic product and cost-reduction objectives. As a result, we
expect these expenses to increase in absolute dollars in the future.
 
     In fiscal 1998, we initiated a plan to reduce our operating expenses by
restructuring our operations. In connection with this plan, we recorded a $3.2
million restructuring charge allocated among various expense categories.
 
   
     In connection with the grant of certain stock options to employees, we
recorded deferred compensation of $307,000 and $5.1 million during fiscal 1998
and the six months ended April 30, 1999, respectively, representing the
difference between the deemed value of our common stock for accounting purposes
and the option exercise price of these options at the date of grant. Deferred
compensation is presented as a reduction of stockholders' equity and amortized
ratably over the vesting period of the applicable options. We amortized $1.4
million of deferred compensation during the six months ended April 30, 1999. We
will expense the balance ratably over the remainder of the vesting period of the
options. See note 6 to our financial statements.
    
 
   
     As of October 31, 1998, we had operating loss carryforwards of
approximately $22.1 million for federal purposes and $10.0 million for state
purposes. The federal net operating loss carryforwards expire on various dates
between 2010 and 2018, and the state net operating loss carryforwards will begin
to
    
                                       21
<PAGE>   23
 
expire in 2003. We have provided a full valuation allowance against our deferred
tax assets, consisting primarily of net operating loss carryforwards, because of
the uncertainty regarding their realization.
 
RESULTS OF OPERATIONS
 
     The following table sets forth certain financial data for the periods
indicated as a percentage of total revenues.
 
   
<TABLE>
<CAPTION>
                                                                             SIX MONTHS
                                                          YEAR ENDED           ENDED
                                                          OCTOBER 31,        APRIL 30,
                                                        ---------------    --------------
                                                         1997     1998     1998     1999
                                                        ------    -----    -----    -----
                                                                            (UNAUDITED)
<S>                                                     <C>       <C>      <C>      <C>
Revenues:
  Product revenue.....................................   100.0%    92.4%    90.8%    91.5%
  License revenue.....................................      --      7.6      9.2      8.5
                                                        ------    -----    -----    -----
       Total revenues.................................   100.0    100.0    100.0    100.0
Cost of revenues......................................    78.7     65.0     58.6     47.2
                                                        ------    -----    -----    -----
Gross margin..........................................    21.3     35.0     41.4     52.8
                                                        ------    -----    -----    -----
Operating expenses:
  General and administrative..........................    17.3     15.7      8.9      7.6
  Sales and marketing.................................    24.9     21.3     16.7     22.0
  Research and development............................    90.4     60.8     44.1     30.4
  Amortization of deferred compensation...............      --       --       --      7.4
                                                        ------    -----    -----    -----
       Total operating expenses.......................   132.6     97.8     69.7     67.4
                                                        ------    -----    -----    -----
Loss from operations..................................  (111.3)   (62.8)   (28.3)   (14.6)
Other income (expense)................................    (2.0)      .5      1.1       .1
                                                        ------    -----    -----    -----
Net loss..............................................  (113.3)%  (62.3)%  (27.2)%  (14.5)%
                                                        ======    =====    =====    =====
</TABLE>
    
 
   
  SIX MONTHS ENDED APRIL 30, 1998 AND 1999
    
 
   
     Revenues. Total revenues increased by 30.0% from $14.3 million for the six
months ended April 30, 1998 to $18.5 million for the six months ended April 30,
1999. The increase was due primarily to increased unit sales of our products
through an increased customer base. In the six months ended April 30, 1998, one
customer, Sequent, accounted for 83% of our total revenues. In the six months
ended April 30, 1999, three customers, Sequent, McDATA and Data General
accounted for 31%, 25% and 15%, respectively, of our total revenues. Total
revenues for the six months ended April 30, 1999 excludes $3.9 in deferred
revenue in connection with shipments to new customers.
    
 
   
     Gross profit. Gross profit increased from $5.9 million for the six months
ended April 30, 1998 to $9.8 million for the six months ended April 30, 1999.
Gross margin increased from 41.3% for the six months ended April 30, 1998 to
52.7% for the six months ended April 30, 1999. The increases were due to lower
component and manufacturing costs, the allocation of fixed manufacturing costs
over a greater revenue base and software revenue. In addition, during the six
months ended April 30, 1998, our gross margin was adversely affected by a
write-off of obsolete inventory.
    
 
   
     General and administrative expenses. General and administrative expenses
increased by 12.0% from $1.3 million for the six months ended April 30, 1998 to
$1.4 million for the six months ended April 30,
    
 
                                       22
<PAGE>   24
 
   
1999. This increase was due to higher employment costs in the six months ended
April 30, 1999.
    
 
   
     Sales and marketing expenses. Sales and marketing expenses increased by
71.9% from $2.4 million for the six months ended April 30, 1998 to $4.1 million
for the six months ended April 30, 1999. This increase was due primarily to an
increase in personnel.
    
 
   
     Research and development expenses. Research and development expenses
decreased by 11.7% from $6.3 million for the six months ended April 30, 1998 to
$5.6 million for the six months ended April 30, 1999. The decrease primarily
resulted from lower outside engineering and prototyping costs. In addition,
research and development costs for the six months ended April 30, 1998 included
costs associated with a development project which was subsequently abandoned in
connection with the restructuring of our business in July 1998.
    
 
   
     Amortization of deferred compensation. During fiscal 1998 and the six
months ended April 30, 1999, we recorded total deferred compensation of $5.4
million in connection with stock option grants. We are amortizing this amount
over the vesting periods of the applicable options, resulting in amortization
expense of $1.4 million for the six months ended April 30, 1999.
    
 
   
  YEARS ENDED OCTOBER 31, 1996, 1997 AND 1998
    
 
     Revenues. We shipped our first commercial product in the second quarter of
fiscal 1997, generating revenues of $8.5 million for the year. Total revenues
increased by 185.0% to $24.2 million in fiscal 1998 reflecting the ramp-up of
sales to a significant original equipment manufacturer customer, the
introduction of the SilkWorm Express product and the recognition of $1.8 million
in license revenue. Unit shipments of SilkWorm increased by 242.0% from fiscal
1997 to fiscal 1998. However, average unit selling prices decreased by 26.0% in
fiscal 1998, due primarily to the introduction of SilkWorm Express, a lower port
count product.
 
   
     Gross Profit. Gross profit increased from $1.8 million in fiscal 1997 to
$8.5 million in fiscal 1998. Gross margin increased from 21.3% in fiscal 1997 to
35.0% in fiscal 1998. Fiscal 1997 cost of revenues included higher component and
manufacturing costs associated with the lower initial production volumes, as
well as overhead costs which were applied to a relatively low number of units
produced. In fiscal 1998, cost of revenues was also reduced as a result of the
decision to outsource all manufacturing activities during the year. In addition,
there were no significant costs associated with $1.8 million of license revenue
in fiscal 1998, resulting in an overall gross margin increase. However, this
increase was somewhat offset by a $1.3 million restructuring charge resulting
from the write-off of certain inventory and equipment related to a change in
contract manufacturers.
    
 
     General and administrative expenses. General and administrative expenses
increased from $575,000 for fiscal 1996 to $1.5 million for fiscal 1997 and to
$3.8 million for fiscal 1998. These increases were primarily due to increased
staffing and associated expenses necessary to manage and support our increased
scale of operations. Fiscal 1998 expenses were also affected by costs related to
a business restructuring which totaled $1.2 million, primarily related to the
termination of 20 employees, including severance arrangements for our former
Chief Executive Officer.
 
   
     Sales and marketing expenses. Sales and marketing expenses increased from
$152,000 in fiscal 1996 to $2.1 million in fiscal 1997 and to $5.2 million in
fiscal 1998. The increases reflect the hiring of additional sales and marketing
personnel.
    
 
     Research and development expenses. Research and development expenses
increased from $3.1 million in fiscal 1996 to $7.7 million in fiscal 1997 and to
$14.7 million in fiscal 1998. These increases reflect significant research and
development efforts required to bring the SilkWorm and SilkWorm Express products
to market and to begin development of second generation products. The
 
                                       23
<PAGE>   25
 
increase in fiscal 1998 expenses also reflects restructuring costs associated
with the cancellation of new product development and simulation projects.
 
   
     Amortization of deferred compensation. During fiscal 1998, we recorded
deferred compensation of $307,000 in connection with stock options grants. We
are amortizing this amount over the vesting periods of the applicable options,
resulting in amortization expense of $7,000 in fiscal 1998.
    
 
                                       24
<PAGE>   26
 
QUARTERLY RESULTS OF OPERATIONS
 
   
     The following tables set forth certain unaudited statement of operations
data for each of the eight quarters ended April 30, 1999, as well as such data
expressed as a percentage of our total revenues for the quarters presented. This
unaudited quarterly information has been prepared on the same basis as our
audited financial statements and, in the opinion of our management, reflects all
normal recurring adjustments that we consider necessary for a fair presentation
of the information for the periods presented. Operating results for any quarter
are not necessarily indicative of results for any future period.
    
 
   
<TABLE>
<CAPTION>
                                                                     THREE MONTHS ENDED
                            -----------------------------------------------------------------------------------------------------
                            JULY 31,   OCTOBER 31,   JANUARY 31,   APRIL 30,   JULY 31,   OCTOBER 31,   JANUARY 31,    APRIL 30,
                              1997        1997          1998         1998        1998        1998          1999          1999
                            --------   -----------   -----------   ---------   --------   -----------   -----------   -----------
                                                                       (IN THOUSANDS)
<S>                         <C>        <C>           <C>           <C>         <C>        <C>           <C>           <C>
Revenues:
  Product revenue.........  $ 1,534      $ 6,347       $ 7,824      $ 5,134    $ 4,056      $ 5,400       $ 6,429       $10,540
  License revenue.........       --           --            26        1,286        513            7         1,578            --
                            -------      -------       -------      -------    -------      -------       -------       -------
    Total revenues........    1,534        6,347         7,850        6,420      4,569        5,407         8,007        10,540
Cost of revenues..........    1,212        4,435         4,697        3,672      4,351        3,039         3,321         5,437
                            -------      -------       -------      -------    -------      -------       -------       -------
Gross profit..............      322        1,912         3,153        2,748        218        2,368         4,686         5,103
                            -------      -------       -------      -------    -------      -------       -------       -------
Operating expenses:
  General and
    administrative........      378          462           639          624      1,979          571           741           674
  Sales and marketing.....      616          839         1,074        1,302      1,444        1,334         1,729         2,357
  Research and
    development...........    2,046        2,847         2,838        3,457      5,016        3,433         2,905         2,729
  Amortization of deferred
    compensation..........       --           --            --           --         --            7         1,157           220
                            -------      -------       -------      -------    -------      -------       -------       -------
    Total operating
      expenses............    3,040        4,148         4,551        5,383      8,439        5,345         6,532         5,980
                            -------      -------       -------      -------    -------      -------       -------       -------
Loss from operations......   (2,718)      (2,236)       (1,398)      (2,635)    (8,221)      (2,977)       (1,846)         (877)
Other income (expense)....      (50)        (119)           43          120        114         (157)            7            29
                            -------      -------       -------      -------    -------      -------       -------       -------
Net loss..................  $(2,768)     $(2,355)      $(1,355)     $(2,515)   $(8,107)     $(3,134)      $(1,839)      $  (848)
                            =======      =======       =======      =======    =======      =======       =======       =======
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                              AS A PERCENTAGE OF TOTAL REVENUES
                            -----------------------------------------------------------------------------------------------------
                            JULY 31,   OCTOBER 31,   JANUARY 31,   APRIL 30,   JULY 31,   OCTOBER 31,   JANUARY 31,    APRIL 30,
                              1997        1997          1998         1998        1998        1998          1999          1999
                            --------   -----------   -----------   ---------   --------   -----------   -----------   -----------
<S>                         <C>        <C>           <C>           <C>         <C>        <C>           <C>           <C>
Revenues:
  Product revenue.........    100.0%       100.0%         99.7%        80.0%      88.8%        99.9%         80.3%         100%
  License revenue.........       --           --            .3         20.0       11.2           .1          19.7           --
                            -------      -------       -------      -------    -------      -------       -------       ------
    Total revenues........    100.0        100.0         100.0        100.0      100.0        100.0         100.0        100.0
Cost of revenues..........     79.0         69.9          59.8         57.2       95.2         56.2          41.5         51.6
                            -------      -------       -------      -------    -------      -------       -------       ------
Gross margin..............     21.0         30.1          40.2         42.8        4.8         43.8          58.5         48.4
                            -------      -------       -------      -------    -------      -------       -------       ------
Operating expenses:
  General and
    administrative........     24.6          7.3           8.1          9.7       43.3         10.6           9.2          6.4
  Sales and marketing.....     40.2         13.2          13.7         20.3       31.6         24.7          21.6         22.4
  Research and
    development...........    133.4         44.8          36.2         53.8      109.8         63.5          36.3         25.9
  Amortization of deferred
    compensation..........       --           --            --           --         --           .1          14.4          2.1
                            -------      -------       -------      -------    -------      -------       -------       ------
    Total operating
      expenses............    198.2         65.3          58.0         83.8      184.7         98.9          81.5         56.8
                            -------      -------       -------      -------    -------      -------       -------       ------
Loss from operations......   (177.2)       (35.2)        (17.8)       (41.0)    (179.9)       (55.1)        (23.0)        (8.4)
Other income (expense)....     (3.2)        (1.9)           .5          1.8        2.5         (2.9)           --           .3
                            -------      -------       -------      -------    -------      -------       -------       ------
Net loss..................   (180.4)%      (37.1)%       (17.3)%      (39.2)%   (177.4)%      (58.0)%       (23.0)%       (8.1)%
                            =======      =======       =======      =======    =======      =======       =======       ======
</TABLE>
    
 
                                       25
<PAGE>   27
 
   
     Revenues. Our total revenues increased each quarter from our initial
product introduction during the three months ended April 30, 1997 through the
three months ended January 31, 1998 when total revenues reached $7.9 million.
The substantial increase in total revenues for the three-month periods ended
October 31, 1997 and January 31, 1998 primarily resulted from purchases by an
original equipment manufacturer customer in connection with the customer's
product launch and hub replacement program. Total revenues decreased to $6.4
million and $4.6 million for the three-month periods ended April 30 and July 31,
1998 due to reduced purchases by the same customer because of its inventory
position. Since July 31, 1998, total revenues have increased each quarter,
primarily as a result of an expanded customer base.
    
 
   
     Gross margin. Gross margin has generally increased each quarter since we
commenced volume shipments in the three months ended July 31, 1997. Gross margin
increased from 21.0% in the three months ended July 31, 1997 to 58.5% in the
three months ended January 31, 1999. These increases have been due to reduced
production costs on a per unit basis as manufacturing volumes increased, a
reduction in manufacturing costs due to increased use of outsourcing and
nonrecurring license revenue in the three months ended January 31, 1999. The
only exceptions to this trend were in the third quarter of fiscal 1998 when
gross margin decreased to 4.8% and in the second quarter of fiscal 1999 when
gross margin decreased to 48.4%. The decrease in gross margin in the three
months ended July 31, 1998 was due primarily to a corporate restructuring charge
of $1.3 million associated with the outsourcing of manufacturing, which resulted
in a reduction of internal manufacturing personnel and the write-off of excess
and obsolete inventory. The decrease in gross margin from 58.5% in the three
months ended January 31, 1999 to 48.4% in the three months ended April 30, 1999
was primarily the result of no technology licensing revenue in the three months
ended April 30, 1999.
    
 
   
     Operating expenses. Operating expenses increased each quarter until our
restructuring in the three months ended July 31, 1998. In connection with this
restructuring plan, we recorded a $1.9 million charge to operating expenses,
which included a $700,000 charge to research and development expenses and a $1.2
million charge to general and administrative expenses. The restructuring charge
included costs associated with a reduction of personnel in these areas, the
write-off of excess equipment and the write-off of other tangible and intangible
assets related to the cancellation of certain development and simulation
projects. Subsequent to the restructuring, total operating expenses, excluding
amortization of deferred compensation, were $5.3 million and $5.4 million in the
three-month periods ended October 31, 1998 and January 31, 1999, respectively.
These quarterly operating expense levels were consistent with the operating
expense levels in the three months ended April 30, 1998. Operating expenses,
excluding amortization of deferred compensation increased to $5.8 million in the
three months ended April 30, 1999 primarily due to an increase in sales and
marketing personnel.
    
 
LIQUIDITY AND CAPITAL RESOURCES
 
   
     We have funded our operations to date primarily through the sale of
preferred stock, for net proceeds of approximately $37.0 million, capital
equipment lease lines and bank debt. During fiscal 1996, cash utilized by
operating activities was $3.4 million, compared to $7.3 million in fiscal 1997,
$11.6 million in fiscal 1998 and $1.3 million in the six months ended April 30,
1999. The increases in cash utilized reflect the increased working capital
required to fund expanding operations and increases in inventories and accounts
receivable. Capital expenditures were $1.5 million in fiscal 1996, $3.4 million
in 1997, $3.8 million in 1998 and $1.0 million in the six months ended April 30,
1999. These expenditures reflect our investments in computer equipment, software
development tools and facilities, which were required to support our business
expansion.
    
 
   
     Our principal sources of liquidity as of April 30, 1999 consisted of $8.7
million in cash and cash equivalents and our bank credit facility. The credit
facility includes a revolving line of credit providing borrowings up to the
lesser of $4.0 million or 80% of eligible accounts receivable and an equipment
loan
    
 
                                       26
<PAGE>   28
 
   
agreement providing for financing up to $5.0 million. Borrowings under the
revolving line of credit bear interest at the bank's prime rate, which was 8.5%
at April 30, 1999, are secured by our accounts receivable and inventories, and
are payable in August 1999. Borrowings under the equipment loan agreement bear
interest at the bank's prime rate plus 1.0%, are secured by the related capital
equipment and are payable through June 30, 2002. The line of credit and
equipment loan contain provisions that prohibit the payment of cash dividends
and require the maintenance of specified levels of tangible net worth and
certain financial ratios measured on a monthly basis. As of April 30, 1999,
there were borrowings under the revolving line of credit of $1.2 million and
under the equipment financing of $2.6 million. We intend to pay off our existing
line of credit and equipment loan with a portion of the net proceeds of this
offering.
    
 
     We believe the net proceeds of this offering, together with our existing
cash balances and credit facilities and cash flow expected to be generated from
future operations, will be sufficient to meet our capital requirements at least
through the next 12 months, although we could be required, or could elect, to
seek additional funding prior to that time. Our future capital requirements will
depend on many factors, including the rate of revenue growth, the timing and
extent of spending to support product development efforts and expansion of sales
and marketing, the timing of introductions of new products and enhancements to
existing products, and market acceptance of our products. There can be no
assurances that additional equity or debt financing, if required, will be
available on acceptable terms or at all.
 
YEAR 2000 COMPLIANCE
 
     Impact of the year 2000 computer problem. The year 2000 computer problem
refers to the potential for system and processing failures of date-related data
as a result of computer-controlled systems using two digits rather than four to
define the applicable year. For example, computer programs that have
time-sensitive software may recognize a date represented as "00" as the year
1900 rather than the year 2000. This could result in a system failure or
miscalculations causing disruptions of operations, including among other things,
a temporary inability to process transactions, send invoices, or engage in
similar normal business activities.
 
     To date, we have experienced no year 2000 issues with any of our internal
systems or our products, and we do not expect to experience any.
 
     Our year 2000 program. We have based our year 2000 compliance program on
the program adopted by the U.S. Government Accounting Office. Our program is
divided into six phases: awareness, assessment, renovation, validation,
implementation and monitoring. The program covers our information technology
systems, non-information technology systems and embedded technology. We have
completed the awareness phase, substantially completed the assessment phase and
are starting the renovation phase. We expect to be completed with the
implementation phase by the end of the summer of 1999.
 
     State of readiness of our products. We have been testing our existing
products for use in the year 2000 and beyond, and believe that using our
products as documented should not cause any year 2000 related issues. While we
believe our products are year 2000 compliant, it is impractical for us to test
our products in every computer environment or with all available combinations of
our products with components supplied by our customers or other third party
suppliers. As a result, there may be situations where the combination of our
products working with components supplied by other third parties could result in
year 2000 issues.
 
     State of readiness of our internal systems. Our business may be affected by
year 2000 issues related to non-compliant internal systems developed by us or by
third-party vendors. We are requesting written assurances from our third-party
vendors for all of our material systems that such systems are year 2000
 
                                       27
<PAGE>   29
 
   
compliant. To date, we have identified one internal system that will require an
upgrade to be year 2000 compliant and one of our enterprise systems that
utilizes a database system that will require an upgrade to be year 2000
compliant. These upgrades are currently available. In addition, several of our
administrative and engineering systems rely on an operating system that will
require an upgrade to be year 2000 compliant, which is currently available. Most
of our productivity systems and personal computers utilize Microsoft Windows 95
and 98 operating systems and Microsoft NT 4.0. While the Microsoft Windows 95
and 98 environments have available year 2000 upgrades, to date Microsoft has not
provided what we consider a usable year 2000 upgrade for the NT 4.0 environment.
We believe that Microsoft will provide this upgrade in a timely manner to avoid
any year 2000 problems. We believe we will be able implement all available
upgrades by the end of the summer in 1999. No projects have been deferred due to
the year 2000 issue.
    
 
     State of readiness of our facilities. The operation of our facilities also
depends upon the computer-controlled systems of third parties such as suppliers
and service providers. We believe that absent a systemic failure outside our
control, such as a prolonged loss of electrical or telephone service, year 2000
problems of these third parties will not have a material impact on our
operations. Our facilities use limited embedded technology and the failure of
that technology is not expected to have a material impact on our operations.
 
     State of readiness of key third parties. Our third party suppliers are
sensitive to the need to be year 2000 compliant. As part of the assessment phase
of our year 2000 program we are requesting written assurances from our third
party suppliers that they are year 2000 compliant. Some of our third party
suppliers have indicated that they are year 2000 compliant. However, others are
in a year 2000 compliance review process. Therefore, at this time they are not
in a position to provide us with year 2000 compliance assurance. If we identify
a material year 2000 compliance issue with a third party supplier, we will work
with that supplier to resolve the issue or source the parts or services from a
supplier that is year 2000 compliant.
 
     Use of independent verification. We have not used external agencies or
partners to verify or validate year 2000 readiness. We do not feel that the
scope of our program warrants this time and expense.
 
     Cost. Based on our assessment to date, we do not anticipate that costs
associated with remediating our internal systems will exceed $250,000.
 
     Worst case year 2000 scenario. While it is impossible to evaluate every
aspect of year 2000 compliance, we believe the worst case scenario related to
year 2000 compliance issues would be the failure of a sole or limited source
supplier to be year 2000 compliant. The failure of one of these suppliers to be
year 2000 compliant could seriously interrupt the flow of materials into the
manufacturing process and therefore delay the manufacture and sale of our
products. However, due to the general uncertainty inherent in the year 2000
computer problem resulting from the uncertainty of the year 2000 readiness of
third-party suppliers and vendors, we are unable to determine at this time
whether the consequences of year 2000 failures will have a material impact on
our business.
 
     Additional risks. Any failure by us to make our products year 2000
compliant could result in a decrease in sales of our products, an increase in
allocation of resources to address year 2000 problems of our customers without
additional revenue commensurate with such dedication of resources, or an
increase in litigation costs relating to losses suffered by our customers due to
such year 2000 problems. Failures of our internal systems could temporarily
prevent us from processing orders, issuing invoices, and developing products,
and could require us to devote significant resources to correcting such
problems.
 
                                       28
<PAGE>   30
 
RECENT ACCOUNTING PRONOUNCEMENTS
 
     In December 1998, the AICPA issued SOP 98-9, "Modification of SOP 97-2,
Software Revenue Recognition, With Respect to Certain Transactions." SOP 98-9
amends SOP 97-2 and SOP 98-4 by extending the deferral of the application of
certain provisions of SOP 97-2 amended by SOP 98-4 through fiscal years
beginning on or before March 15, 1999. All other provisions of SOP 98-9 are
effective for transactions entered into in fiscal years beginning after March
15, 1999. We have not had significant software sales to date and do not expect
the adoption of SOP 98-9 to have a significant effect on our financial condition
or results of operations.
 
QUALITATIVE AND QUANTITATIVE DISCLOSURE ABOUT MARKET RISK
 
     Our interest income is sensitive to changes in the general level of U.S.
interest rates, particularly since the majority of our investments are in
short-term instruments. Due to the nature of our short-term investments, we have
concluded that there is no material market risk exposure. Therefore, no
quantitative tabular disclosures are required.
 
                                       29
<PAGE>   31
 
                                    BUSINESS
 
OVERVIEW
 
     We are the leading provider of Fibre Channel switching solutions for SANs,
which apply the benefits of a networked approach to the connection of computer
storage systems and servers. Our family of SilkWorm switches enables companies
to cost-effectively manage growth in their storage capacity requirements,
improve the performance between their servers and storage systems and increase
the size and scope of their SAN, while allowing them to operate data-intensive
applications, such as data backup and restore, and disaster recovery, on the
SAN. We sell our SAN switching solutions through leading storage systems and
server original equipment manufacturers, including Compaq Computer, Dell
Computer, McDATA Corporation, Sequent Computer Systems and StorageTek. These
original equipment manufacturers and our system integrator customers combine our
switching solutions with other system elements and services for companies' data
processing centers.
 
INDUSTRY BACKGROUND
 
  BUSINESS-CRITICAL DATA STORAGE REQUIREMENTS
 
     The last decade has seen an explosion in the volume of business-critical
data that is being captured, processed, stored and manipulated in business
environments. This has fueled an increase in demand for data storage capacity.
According to International Data Corporation, an independent industry research
company, from 1994 to 2002, shipments of direct access storage capacity, which
excludes tape and optical storage, are expected to increase more than a
hundredfold. Efficient data storage and management is becoming one of the most
important aspects of business-critical decision making. Increased reliance on
applications ranging from business intelligence and decision support, data
warehousing and data mining of large databases, disaster tolerance and recovery,
enterprise software, and imaging and graphics have all contributed to this
trend. In addition, the development of Web-based business operations and
e-commerce in particular, has intensified the demand placed on data centers.
Customer interactions over the Web have increased operational focus on the
performance, scalability, management and flexibility of systems that use
business-critical data. This dependence on data for fundamental business
processes by employees, customers and suppliers has greatly increased the number
of input and output transactions, or I/Os, required of computer storage systems
and servers. In addition, the complexity of enterprise computing and storage is
further compounded by the use of multiple incompatible server operating systems,
such as the proliferation of Windows NT in traditional UNIX environments. As a
result, organizations are being forced to dedicate substantial financial and
personnel resources to manage and maintain the distributed storage capabilities
of their networks.
 
  BOTTLENECK IN STORAGE AND SERVER CONNECTIONS
 
     Despite the increased attention and resources which have been devoted to
data storage requirements, the technical capabilities of data storage systems
have not kept pace with increasing data management demands and with the
advancements in other networking technologies. In the 1980s, the near ubiquity
of PCs, workstations and servers required broader connectivity, resulting in the
development of local and wide area networks to support messaging between
computer systems. The data used by computers and servers connected to local and
wide area networks are typically located on computer storage systems and
servers, which store, process and manipulate data. The adoption of high speed
messaging technologies such as gigabit Ethernet and asynchronous transfer mode,
or ATM, increased local and wide area network transmission speeds by more than
1,000 times during the 1990s. However, storage-to-server data transmission
speeds increased by less than ten times during this period, creating a
bottleneck between the local or wide area network and business-critical storage
systems and servers.
 
                                       30
<PAGE>   32
 
     Traditionally, distributed systems have linked a single server with a
limited number of storage systems in close proximity. The Small Computer Systems
Interface, or SCSI, standard was adopted as the I/O interface standard for
storage-to-server and server-to-server connections in the 1980s. SCSI is a
parallel interface that permits throughput of 20 to 40 megabytes per second.
SCSI's throughput limitations have become much more pronounced as local and wide
area network transmission technologies have migrated from Ethernet, which
transfers data at 10 megabits per second, to gigabit Ethernet, which transfers
data at 1,000 megabits per second. In addition, SCSI allows a maximum
transmission distance of only 12 meters and supports just 32 devices on a single
bus. As a result, SCSI does not adequately support the increasing requirements
for speed, scalability and flexibility of today's data-intensive enterprises.
 
  INTRODUCTION AND STANDARDIZATION OF FIBRE CHANNEL
 
     In response to the demand for high-speed and high-performance
storage-to-server and server-to-server connectivity, the Fibre Channel
interconnect protocol, an industry networking standard, was developed in the
early 1990s. The Fibre Channel interconnect standard received American National
Standards Institute, or ANSI, approval in 1994 and has subsequently earned broad
support from industry and independent testing laboratories. Fibre Channel
supports large data block transfers at gigabit speeds and is therefore well
suited for data transfers between storage systems and servers. It also supports
multiple protocols such as SCSI and Internet Protocol, or IP. Furthermore, it
provides transmission reliability with guaranteed delivery and transmission
distances of up to 10 kilometers. Fibre Channel complements and supports
advancements in local and wide area network technologies, such as gigabit
Ethernet and ATM, which are not effective for large block data-intensive
transfers.
 
  ADVENT OF THE STORAGE AREA NETWORK
 
     Fibre Channel has enabled the development of a storage area network, or
SAN, to meet the requirements of data centers and other data-intensive,
distributed computing environments. Similar to local and wide area networks, the
SAN applies the distributed computing model to computer storage systems and
servers and takes advantage of the inherent benefits of a networked approach.
These benefits include the decoupling of computer storage systems and servers,
increasing scalability and providing a higher level of connectivity than
currently exists in the SCSI environment. Additionally, the SAN provides
high-speed connectivity for data-intensive applications across multiple
operating systems, including UNIX and Windows NT. By bringing networking
technology into the data processing center, a SAN also provides increased
flexibility, fault tolerance, ease of management and lower total cost of
ownership. The SAN market is expected to grow substantially as organizations
embrace this emerging solution. According to the Gartner Group, an independent
industry research company, more than 70% of shared storage in networked
environments is projected to be reorganized into SANs by the year 2002.
 
     The simplest SAN configuration is a loop topology, which is similar to
traditional SCSI-based distributed systems and interconnects multiple nodes over
a shared Fibre Channel networking device, such as a hub. A Fibre Channel hub can
support up to 126 devices, but the available bandwidth is shared among all the
devices, resulting in signal and performance degradation as the number of
devices in the loop increases. In addition, loop topologies suffer from limited
network management and fault isolation capabilities. For example, when a single
device is added to the loop, it will cause the loop to reset, resulting in
application disruption. The limitations of shared networks have been addressed
in local and wide area network environments by the development of switching
technologies that have yielded advancements in performance, scalability,
flexibility and management at competitive costs. In order for the SAN model to
become more widely adopted in data centers, today's enterprises must be able to
connect any device on the network to any other device on the network, or
any-to-any connectivity, without performance degradation in order to effectively
leverage distributed computer storage systems,
 
                                       31
<PAGE>   33
 
servers, workstations and other resources. Guaranteed reliability and
availability are vital to the storage, processing and manipulation of
business-critical data. Networks require dedicated connections operating at high
performance levels to support large data transfer demands. Finally, data
processing centers are characterized by a high degree of change that must be
supported by a flexible network infrastructure.
 
THE BROCADE SOLUTION
 
     We are the leading provider of Fibre Channel SAN switching solutions. We
combine advanced switching technologies with our Fibre Channel technology
leadership and systems expertise to provide the Brocade Fabric, comprised of
Fibre Channel switches, a proprietary switch operating system, management tools,
management services and ready-to-deploy configurations. Our products provide an
infrastructure backbone that allows our customers to concurrently run multiple
applications across the SAN, reducing congestion of local and wide area
networks. Our Brocade Fabric helps enterprises cost-effectively manage the
growth in storage capacity, improve server-to-storage and server-to-server
performance, and increase the size and scope of their SANs, while enabling
data-intensive applications, such as reliable backup and restore and disaster
recovery. Our solutions have the following key benefits:
 
     Address the input/output bottleneck. Deployment of SANs based on our
Brocade Fabric not only enhances point-to-point bandwidth with Fibre Channel
connections, but helps solve the I/O bottleneck between data storage systems and
servers. Our SilkWorm family of Fibre Channel switches delivers full-duplex 1
gigabit per second performance at every port. In addition, unlike hubs or other
shared devices, our switches are designed to provide any-to-any connectivity and
to maintain 1 gigabit per second performance per port as additional devices are
added to the SAN. Our superior frame-forwarding capability provides end-users
with rapid data retrieval and allows a greater number of user transactions.
 
     Provide SAN scalability. Our modular Fibre Channel switches, supporting
from two to 16 ports per switch, enable incremental growth by interconnecting or
cascading multiple switches for hundreds of connections in a fully meshed
configuration. Our Brocade Fabric enables companies to grow clusters of high
performance servers or provide multiple servers with high bandwidth connections
to multiple storage systems. Additionally, Fibre Channel allows connections up
to 10 kilometers, enabling companies to interconnect separate SAN clusters or
islands into a single SAN.
 
     Enable SAN applications. The Brocade Fabric creates a SAN backbone for
data-intensive applications, enabling organizations to solve complex problems in
data processing centers. Our products allow all departments within an
organization to share data storage resources despite operating within a
computing environment that includes incompatible operating systems sharing
storage resources. The Brocade Fabric allows highly flexible configurations and
supports a wide range of data traffic, including high throughput and low latency
processing. For example, high throughput applications, such as data backup and
restore, and disaster recovery can be performed on the SAN, freeing up valuable
bandwidth on the local and wide area network and eliminating the need for
expensive backup servers. Additionally, companies utilizing the Brocade Fabric
for their e-commerce and other low latency transaction processing applications
can leverage hundreds of computer storage devices and servers.
 
     Support a mission-critical data processing center. We have designed our
solutions to provide high levels of resiliency and availability with maximum
up-time for business-critical, data-intensive applications. Our switches have
auto-configuration and reconfiguration capabilities that incorporate redundant
and alternate data paths for frame forwarding, which enable our Brocade Fabric
to be self-healing. They also support up to eight parallel links to other
switches. As a result, any cable, port, switch or link failure can be isolated,
providing a resilient solution. This increases the availability and up-time of
the data processing center.
 
                                       32
<PAGE>   34
 
     Enhance SAN management. Our Brocade Fabric Operating System and our network
management tools enable our customers to centrally manage storage systems and
servers handling business-critical data. Our products deliver a rich set of SAN
management information that can be accessed both locally and remotely.
Data-intensive connections in the organization can be centrally managed to share
resources with other points on the network. All of these factors combine to help
organizations reduce the overall costs and increase the efficiency of their data
network.
 
THE BROCADE STRATEGY
 
     Our objective is to maintain our position as the leading provider of SAN
switching solutions. The key elements of our strategy include the following:
 
     Leverage our SAN switching market leadership. We believe we were the first
company to provide a comprehensive Fibre Channel fabric solution and that we are
the market leader based upon the number of switch ports shipped. We intend to
capitalize on our first mover advantage and in-depth customer and product
knowledge. We believe we are well positioned to anticipate the future
requirements of the SAN marketplace.
 
     Capitalize on leadership in Fibre Channel technologies and standards. We
have been a leader in the development of Fibre Channel technologies and the
implementation of ANSI Fibre Channel standards. Our technology efforts are led
by some of the most widely recognized members of the Fibre Channel industry. In
addition, our technical personnel have substantial expertise in storage, file
system, routing algorithms and network management technologies. We have also
provided major contributions to many of the ANSI Fibre Channel standards that
have been developed to date. We believe that taking a continued proactive role
in this expanding market will enable us to extend our leading market position.
 
     Leverage core architecture. We are leveraging our core switching expertise,
ASIC architectures, Brocade Fabric Operating System and Fibre Channel technology
to expand our family of SilkWorm products to address the expanding SAN market.
While to date we have focused on the workgroup and midrange segments of the SAN
market, we intend to leverage our leadership position in these segments to
broaden our reach into other segments of the SAN switch market as they emerge.
We expect that the demand for SAN switching solutions in entry level
applications will increase, particularly as Windows NT-based servers are
increasingly used in data processing centers. We are developing products
designed to address the specific needs of organizations that use Windows
NT-based servers in anticipation of this growth.
 
     Continue to expand network of original equipment manufacturers and system
integrators. We intend to continue to expand our relationships with key computer
storage system and server original equipment manufacturers and system
integrators, both domestically and abroad. Currently, our major original
equipment manufacturers customers include Compaq Computer, Dell Computer,
McDATA, Sequent Computer Systems and StorageTek. These relationships allow us to
leverage the systems and services capabilities of these industry-leading
original equipment manufacturers. We have also recently entered into
relationships with system integrators including Cranel, Polaris, RAID Power,
Tokyo Electron Ltd. and TranSoft Networks. We expect that our relationships with
leading system integrators will allow us to penetrate the market opportunities
by leveraging the reach of these distribution channels.
 
     Develop strategic partnerships. We are building strategic relationships
with Fibre Channel component and device vendors and storage management software
companies. By partnering with these organizations, we believe we can enhance SAN
applications and interoperability, thereby accelerating the time to market and
overall deployment and functionality of our products.
 
                                       33
<PAGE>   35
 
CUSTOMERS
 
     Our primary customers are original equipment manufacturers. The following
is a representative list of our original equipment manufacturer customers who
have purchased more than $500,000 worth of products since the beginning of
fiscal 1998:
 
   
<TABLE>
<S>                                     <C>
Compaq Computer                         Sequent Computer Systems
Dell Computer                           StorageTek
McDATA
</TABLE>
    
 
   
     Sequent and McDATA accounted for approximately 72% and 11%, respectively,
of our total revenues in the fiscal year ended October 31, 1998. Sequent, McDATA
and Data General accounted for approximately 31%, 25% and 15%, respectively, of
our total revenues for the six months ended April 30, 1999. Our total revenues
do not include deferred revenue.
    
 
     In the third quarter of fiscal 1998, we launched our system integrators
program. To date, we have entered into relationships with Cranel, Polaris, RAID
Power, Tokyo Electron Ltd. and TranSoft Networks.
 
CUSTOMER SERVICE AND SUPPORT
 
     Our customer service and support organization provides technical support to
our original equipment manufacturers and system integrators, enabling them to
provide technical support to their end-users. We prepare our original equipment
manufacturer and system integrator customers for product launch through a
comprehensive training program. In addition, we employ systems engineers for
pre- and post-sales support and technical support engineers for field support.
Our original equipment manufacturers and system integrator customers provide
primary technical support.
 
     We have developed an extensive training course for our original equipment
manufacturer and system integrator customers. The curriculum includes Fibre
Channel architecture, SAN implementation and Brocade product training.
 
SALES AND MARKETING
 
   
     Our sales and marketing strategy is focused on an indirect sales model
executed through original equipment manufacturers and system integrators. Our
distribution channels are supported by a sales and marketing organization
comprised of managers, sales representatives and technical and administrative
support personnel. We have entered into a relationship with a distributor in
Japan, and we expect to expand our international sales activities. Our marketing
effort is focused on developing strategic partnerships and relationships with
industry analysts, providing customer sales support, managing new product
planning and supporting industry standard initiatives.
    
 
     Original equipment manufacturers. We have established key relationships
with several storage systems and server original equipment manufacturers. Each
original equipment manufacturer provides installation, service and technical
support to its customers while we focus on high-level back-up support. In
addition to maintaining and enhancing our relationships with our existing
original equipment manufacturer customers, we intend to pursue relationships
with additional original equipment manufacturers that may offer products or
distribution channels that complement ours. We believe that these relationships
allow us to leverage the systems and services capabilities of our original
equipment manufacturers.
 
     System integrators. We have recently launched our system integrator program
and have established several relationships within this channel. Although we have
not experienced significant volume from this
 
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<PAGE>   36
 
channel to date, we believe revenues from this channel may increase
significantly in the future. Each system integrator provides installation,
service and technical support to its customers, while we focus on integration
and technical back-up support. We intend to continue to develop relationships
with system integrators who may offer products or distribution channels that
complement ours.
 
PRODUCTS
 
     Brocade provides the SilkWorm family of Fibre Channel switches, which
creates a switch interconnect, enabling any-to-any connectivity between storage
devices and servers. SilkWorm switches can be used individually for server
clustering or storage consolidation, or cascaded with other switches to form a
powerful networking infrastructure, the Brocade Fabric. Brocade's software
solutions provide network administrators with tools to manage the switches and
the SAN. Brocade also provides extensive Fabric services, in order to optimize
the Brocade Fabric for an enterprise's particular needs. Moreover, Brocade
SOLUTIONware provides instructions to enterprises on implementing SANs.
 
  SILKWORM FAMILY OF SWITCHES
 
     Our SilkWorm switches are a key element of a SAN. SilkWorm, introduced in
March 1997, is a configurable 16-port switch used to connect servers to storage
devices to create a SAN. File servers and storage devices can then access
information anywhere on the SAN. In April 1998, Brocade introduced SilkWorm
Express, an eight-port Fibre Channel switch.
 
     The SilkWorm family of switches share a common platform designed to provide
the following features and benefits:
 
      --  High throughput. Each port delivers a 1 gigabit per second,
          full-duplex data rate regardless of network connectivity.
 
      --  Hardware-based data path. SilkWorm reduces latency by eliminating
          software processing from the path of data frames.
 
      --  Management. SilkWorm supports customers' existing management
          solutions, such as local and wide area networks, SCSI tools and web
          tools.
 
      --  In-order delivery of data frames. SilkWorm guarantees that frames are
          delivered to a destination in the same order as received by the switch
          from the originator.
 
      --  Cut-through frame routing. Frames are sent without waiting for the
          entire frame or for a response back from its destination, thereby
          improving bandwidth utilization and minimizing transmission delays.
 
      --  Cascading. SilkWorm may be connected to as many other SilkWorm
          switches as there are available ports creating in a meshed topology,
          enabling hundreds of connections and large SANs.
 
      --  Flexible switch buffering. If the destination is busy, data frames are
          stored by a SilkWorm switch for only as long as is necessary, thereby
          moving data faster through the switch.
 
      --  Path selection. SilkWorm identifies failures automatically and
          immediately, and reroutes data to alternate paths, creating a highly
          resilient network.
 
      --  Registered state change notification. SilkWorm automatically detects
          changes in configuration and port status to enable quick corrective
          action.
 
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<PAGE>   37
 
      --  Media independent. SilkWorm enables the SAN to support diverse media,
          including fiberoptic connections up to 10 kilometers and copper
          connections.
 
      --  Auto-configuration. SilkWorm enhances scalability by automatically
          expanding the SAN as new devices are added or removed without
          interrupting the operation of the rest of the network. SilkWorm
          seamlessly incorporates more Brocade switches into the network,
          thereby increasing aggregate bandwidth as connectivity increases;
          network services automatically expand without additional system
          resources.
 
  BROCADE FABRIC OPERATING SYSTEM
 
     The SilkWorm family of switches is supported by the Brocade Fabric
Operating System. The Brocade Fabric Operating System provides the intelligence
for the Brocade Fabric, provides services for the switch hardware, runs the
value-added Brocade Fabric services such as name service, which is used to
assist discovery of connected devices, monitors the status of the hardware and
fabric and notifies the host operating system as devices are added to or removed
from the Brocade Fabric.
 
     The Brocade Fabric Operating System provides a common platform upon which
system services can be built. The Brocade Fabric Operating System is layered
with well-defined application interfaces, or APIs, that allow third parties,
such as data storage and data backup software vendors, to write applications
that leverage Brocade's Fabric Operating System. By incorporating API
technology, these third party vendors can develop applications, thereby
increasing the capabilities of the overall switch fabric solution.
 
  FABRIC SERVICES
 
     Fabric services are product features that increase the functionality of the
SAN. Our current Brocade Fabric Services include zoning and multicasting.
 
     Brocade Zoning is an add-on software product that allows the creation of
multiple logical connectivity groups within a single SAN. By creating a zone,
the SAN provides the network with benefits that would otherwise only be possible
using multiple SANs. Through zoning, systems that have different operating
environments, such as UNIX and Window NT, can be isolated from each other
allowing both operating systems to co-exist on a single SAN. Zoning can be used
to create functional areas in the fabric and designate closed user groups for
greater security and control. Also, zoning facilitates time-sensitive functions,
such as creating a temporary zone used to backup storage devices that are
members of other zones. Brocade Zoning offers dynamic configuration and an
unlimited number of zones. Finally, Brocade Zoning allows devices to be a member
of more than one zone thereby increasing flexibility.
 
     Brocade Multicasting enables up to 32 groups of devices to replicate data
in a one-to-one method or in a one-to-many method. By accomplishing this
replication through hardware, Brocade is able to maintain high throughput.
 
  SOLUTIONWARE
 
     Brocade's SOLUTIONware is a set of application notes that facilitates the
implementation of SAN solutions incorporating products and applications from
multiple vendors, including Brocade. These applications notes include specific
details including equipment requirements, software specifics, detailed
installation instructions and tested application software. This enables original
equipment manufacturers and system integrators to replicate high performance
solutions. Our first SOLUTIONware release, Brocade Tape Backup and Restore,
provides customers with a detailed road map to address their data backup needs
using Brocade's products.
 
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<PAGE>   38
 
  MANAGEMENT TOOLS
 
     Brocade Web Tools is an add-on software product that helps to remotely
manage a SAN of our SilkWorm family of switches via the Internet or intranet.
The information technology administrator can log onto a switch from a host with
a java-based Web browser. From that switch, the administrator can monitor the
status and performance of any switch in the SAN.
 
TECHNOLOGY
 
  FIBRE CHANNEL
 
     Fibre Channel is an industry-standard, open protocol for server-to-storage
and server-to-server connectivity and data-intensive transfers. Fibre Channel
combines the high-speed I/O capabilities of a channel technology with the
increased functionality of a networking technology to seamlessly connect and
transfer data from one device to another.
 
     Fibre Channel, which was designed for storage systems and is well suited
for SANs. It offers a single network for both server clustering and shared
storage. It accommodates both high throughput and low latency dependent traffic
required for large block data transfers and inter-processor communication
messages. We believe the following characteristics of Fibre Channel make it more
suitable for data-intensive and storage related applications than either gigabit
Ethernet or ATM, two widely used networking protocols:
 
      --  Fibre Channel has an industry standard interconnect rate of 1 gigabit
          per second per port that is expected to increase to 2 gigabits per
          second in 1999 as compared to gigabit Ethernet's, 1 gigabit per second
          and ATM's 622 megabits per second speeds;
 
      --  Fibre Channel is designed to transmit large packets of information and
          is therefore well-suited for data-intensive applications as compared
          to gigabit Ethernet and ATM, which use smaller packets and are
          designed for smaller but more frequent data transfers;
 
      --  Fibre Channel relies more on hardware than software during data
          transfers and therefore, is better suited to handle the higher speeds
          and low latency required during data transfers;
 
      --  In addition to supporting networking protocols including IP, Fibre
          Channel also supports I/O storage protocols like SCSI;
 
      --  Unlike gigabit Ethernet and ATM, which can lose or drop packets due to
          congestion, Fibre Channel manages packet flow to ensure delivery; and
 
      --  Fibre Channel relieves each port from the responsibility of station
          management and instead delegates that responsibility to the
          interconnect device. Therefore, each Fibre Channel port only has to
          manage a single point-to-point connection between itself and an
          interconnect device.
 
  SILKWORM ARCHITECTURE
 
     Brocade is focused on implementing Fibre Channel standards in the Brocade
Fabric. We utilize a layered architecture to provide a high performance,
flexible, and extensible solution. This architecture is comprised of media
interfaces, a switching platform, the Brocade Fabric Operating System and value-
added services.
 
      --  Media interfaces. Media interfaces comprise the lowest layer of our
          architecture. Fibre Channel standards specify numerous media
          interfaces. The SilkWorm architecture supports removable gigabit
          copper interfaces up to 13 meters, short wavelength laser interfaces
          up to 500 meters and
 
                                       37
<PAGE>   39
 
          long wavelength laser interfaces up to 10 kilometers. Removable media
          interfaces provide flexible product configurations and simple product
          maintenance.
 
      --  Switching platform. Our SilkWorm products are based on a central
          memory time multiplexed switching architecture. The architecture is
          implemented through the use of highly integrated ASICs. The use of
          ASIC technology is required to provide the high bandwidth and low
          latency necessary for Fibre Channel switching to cater to both high
          throughput and low latency data transfer. The switching architecture
          is non-blocking and utilizes cut through routing techniques to achieve
          low latency. The data path of the architecture is completely
          implemented in hardware and the CPU and operating system are not in
          the data path.
 
      --  Brocade Fabric Operating System. The architecture of the Brocade
          Fabric Operating System is highly structured, modular, hardware
          independent and layered with well-defined interfaces. This extensible
          architecture is easy to maintain and upgrade with new features. The
          base operating system is a UNIX-like realtime operating system with
          extensive libraries and services. The layers of the Brocade Fabric
          Operating System include hardware drivers, a board level support
          package, a Fibre Channel layer, services and application program
          interfaces.
 
      --  Value added services. Value-added services comprise the top layer of
          our architecture. Brocade value-added services include Brocade Zoning,
          and multicasting. The Brocade value-added services run on top of the
          Brocade Fabric Operating System through well-defined application
          program interfaces.
 
MANUFACTURING
 
     We currently use a third-party contract manufacturer, Solectron, to
manufacture our products. Solectron invoices Brocade based on prices and payment
terms agreed to by both parties and set forth in purchase orders issued by
Brocade. The pricing takes into account component costs, Solectron's
manufacturing costs and margin requirements. Although we use Solectron for final
turnkey product assembly, we maintain key component expertise internally. We
design and develop the key components of our products, including ASICs and
software, as well as certain details in the fabrication and enclosure of our
products. In addition, we determine the components that are incorporated in our
products and select the appropriate suppliers of the components.
 
     Although we use standard parts and components for our products where
possible, we currently purchase several key components used in the manufacture
of our products from single or limited sources. Our principal single source
components include ASICs, power supplies and chassis, and our principal limited
source components include printed circuit boards and GBICs. See "Risk
Factors -- We Are Dependent on Sole Source and Limited Source Suppliers for
Certain Key Components Including ASICs and Power Supplies."
 
RESEARCH AND DEVELOPMENT
 
   
     In fiscal 1998, and the six months ended April 30, 1999, our research and
development expenses were $14.7 million and $5.6 million, respectively. We
believe that our future success depends on our ability to continue to enhance
our existing products and to develop new products that maintain technological
competitiveness. We focus our product development activities on solving the
needs of SAN users. We work closely with our original equipment manufacturers
and system integrators to monitor changes in the market place. We design our
products around current industry standards and will continue to support emerging
standards that are consistent with our product strategy.
    
 
                                       38
<PAGE>   40
 
     Our products have been designed around a core system architecture, which
facilitates a relatively short product design and development cycle and reduce
the time to market for new products and features. We intend to continue to
leverage our architecture to develop and introduce additional products and
enhancements in the future.
 
     There can be no assurance that our product development efforts will result
in commercially successful products or that our products will not be rendered
obsolete by changing technology or new product announcements by other companies.
See "Risk Factors -- We Currently Only Offer Our SilkWorm Product Family and
Must Develop New and Enhanced Products That Achieve Widespread Market
Acceptance."
 
COMPETITION
 
     Although the competitive environment in the Fibre Channel switching market
has yet to develop fully, we anticipate that the current and potential market
for our products will be highly competitive, continually evolving and subject to
rapid technological change. New SAN products are being introduced by major
server and storage providers, and existing products will be continually
enhanced. We currently face competition from other manufacturers of SAN
switches, including Ancor Communications, Inc. We also face competition from
manufacturers of hubs, including Gadzoox Networks, Inc. and Vixel Corporation.
In addition, as the market for SAN products grows, we may face competition from
traditional networking companies and other manufacturers of networking equipment
who may enter the SAN market with their own switching products. It is also
possible that customers could develop and introduce products competitive with
our product offerings. We believe the competitive factors in this market segment
include product performance and features, product reliability, price, ability to
meet delivery schedules, customer service and technical support.
 
     Some of our current and potential competitors have longer operating
histories, significantly greater resources and name recognition, and a larger
installed base of customers than we have. As a result, these competitors may
have greater credibility with our existing and potential customers. They also
may be able to adopt more aggressive pricing policies and devote greater
resources to the development, promotion and sale of their products than we can
to ours, which would allow them to respond more quickly than we can to new or
emerging technologies and changes in customer requirements. In addition, some of
our current and potential competitors have already established supplier or joint
development relationships with divisions of our current or potential customers.
These competitors may be able to leverage their existing relationships to
discourage these customers from purchasing additional Brocade products or
persuade them to replace our products with their products. Such increased
competition may result in price reductions, lower gross margins and loss of our
market share. There can be no assurance that we will have the financial
resources, technical expertise or marketing, manufacturing, distribution and
support capabilities to compete successfully in the future. There can also be no
assurance that we will be able to compete successfully against current or future
competitors or that competitive pressures will not materially harm our business.
 
INTELLECTUAL PROPERTY
 
     We rely on a combination of patents, trademarks, and trade secrets, as well
as confidentiality agreements and other contractual restrictions with employees
and third parties, to establish and protect our proprietary rights. Despite
these precautions, there can be no assurance that the measures we undertake will
be adequate to protect our proprietary technology, or that they will preclude
competitors from independently developing products with functionality or
features similar to our products. There can be no assurance that the precautions
we take will prevent misappropriation or infringement of our technology. We have
filed 11 patent applications in the United States with respect to our technology
and
 
                                       39
<PAGE>   41
 
are also seeking protection for the technology in selected international
locations. However, it is possible that patents may not be issued for these
applications. Our issued patents may not adequately protect our technology from
infringement or prevent others from claiming that our technology infringes that
of third parties. Failure to protect our intellectual property could materially
harm our business. In addition, our competitors may independently develop
similar or superior technology. It is possible that litigation may be necessary
in the future to enforce our intellectual property rights, to protect our trade
secrets or to determine the validity and scope of the proprietary rights of
others. Litigation could result in substantial costs and diversion of our
resources and could materially harm our business.
 
     From time to time, we have received, and may receive in the future, notice
of claims of infringement of other parties' proprietary rights. Infringement or
other claims could be asserted or prosecuted against us in the future, and it is
possible that past or future assertions or prosecutions could harm our business.
Any such claims, with or without merit, could be time-consuming, result in
costly litigation and diversion of technical and management personnel, cause
delays in the development and release of our products, or require us to develop
non-infringing technology or enter into royalty or licensing arrangements. Such
royalty or licensing arrangements, if required, may not be available on terms
acceptable to us, or at all. For these reasons, infringement claims could
materially harm our business.
 
PENDING LEGAL PROCEEDING
 
   
     In October 1998, we were sued by one of our former contract manufacturers,
Manufacturers' Services Central U.S. Operations, Inc. and Manufacturers'
Services Western U.S. Operations, Inc., collectively referred to as MSL, in the
Santa Clara County, California Superior Court. The suit involves claims by MSL
for approximately $900,000 for amounts allegedly owed by us for circuit boards
manufactured by MSL and previously shipped to us, approximately $500,000 for
circuit boards manufactured for us and held by MSL and approximately $1.5
million for raw material purchased by MSL for inclusion in circuit boards to be
manufactured for us. We do not dispute that we owe MSL for the circuit boards
previously shipped to us, but we contend that the amount owed should be offset
by approximately $600,000 for amounts due to us for circuit boards purchased by
us from MSL under warranty, by approximately $200,000 for the value of equipment
and raw electronic components consigned by us to MSL and by approximately
$150,000 for other damages sustained by us related to MSL's performance during
our manufacturing relationship. We deny any liability for the circuit boards
manufactured by MSL but not shipped to us and for raw material inventory
purchased by MSL.
    
 
   
     In December 1998, MSL obtained a writ of attachment against us related to
the circuit boards manufactured by MSL for approximately $1.4 million. We
responded by posting a bond for this amount. The parties have exchanged
documents and conducted preliminary discovery. MSL and Brocade participated in
non-binding mediation on March 10, 1999; however, the parties did not settle
this dispute.
    
 
   
     Following the mediation, the parties agreed that Brocade would make a
payment of $392,000 to MSL for circuit boards previously shipped to Brocade and
that MSL would sell to Brocade circuit boards previously manufactured but not
shipped to Brocade. The parties also agreed that upon this payment by Brocade,
the bond of $1.4 million would be reduced by the amount paid by Brocade to MSL.
At this time, the parties are finalizing a stipulation related to Brocade's
payment.
    
 
   
     No trial date has been set. A case management conference is scheduled for
June 15, 1999 and the court should set a trial date at the case management
conference.
    
 
   
     We believe that we have strong defenses against MSL's lawsuit. Accordingly,
we intend to defend this suit vigorously. However, we may not prevail in this
litigation. The litigation process is inherently uncertain. Our defense of this
litigation, regardless of its eventual outcome, has been, and will likely
    
 
                                       40
<PAGE>   42
 
   
continue to be, time-consuming, costly and a diversion for our personnel. A
failure to prevail could result in us having to pay monetary damages to MSL,
which could materially harm our business.
    
 
EMPLOYEES
 
   
     As of April 30, 1999, we had 123 full-time employees engaged in research
and development, sales and marketing and finance, administration and operations.
None of our employees are represented by a labor union. We have not experienced
any work stoppages and consider our relations with our employees to be good.
    
 
FACILITIES
 
     Our principal administrative, sales and marketing, education, customer
support and research and development facilities are located in a single office
building in San Jose, California. We currently occupy approximately 35,000
square feet of office space in the San Jose facility under the terms of a lease
that expires in November 2000. We believe our current facilities will be
adequate to meet our needs for the next 12 months. If our growth continues, we
will need larger facilities after that time. We cannot assure you that suitable
additional facilities will be available as needed on commercially reasonable
terms. We also lease office space for sales and marketing in Nashua, New
Hampshire and Irvine, California.
 
                                       41
<PAGE>   43
 
                                   MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
   
     The following table sets forth certain information regarding our executive
officers and directors as of April 30, 1999:
    
 
<TABLE>
<CAPTION>
              NAME                 AGE                        POSITION
              ----                 ---                        --------
<S>                                <C>   <C>
Gregory L. Reyes.................  36    President, Chief Executive Officer and Director
Paul R. Bonderson, Jr............  46    Vice President, Engineering
Michael J. Byrd..................  38    Vice President, Finance and Chief Financial Officer
Kumar Malavalli..................  56    Vice President, Technology
Victor M. Rinkle.................  46    Vice President, Operations
Charles W. Smith.................  37    Vice President, Worldwide Sales
Peter J. Tarrant.................  39    Vice President, Marketing and Business Development
Seth D. Neiman(1)................  44    Chairman of the Board
Neal Dempsey(1)(2)...............  58    Director
Mark Leslie(2)...................  53    Director
Larry W. Sonsini.................  58    Director
</TABLE>
 
- ---------------
 
(1) Member of audit committee.
 
(2) Member of compensation committee.
 
   
     Gregory L. Reyes has served as our President and Chief Executive Officer
and a member of our board of directors since July 1998. From January 1995 to
November 1997, Mr. Reyes served as Chairman of the board of directors, and from
January 1995 to June 1998, served as President and Chief Executive Officer and
Chairman of the board of directors of Wireless Access, Inc., a wireless data
communications products company. From January 1991 to January 1995, Mr. Reyes
served as Divisional Vice President and general manager of Norand Data Systems,
a data collection company. Mr. Reyes also serves as a director of Proxim, Inc.,
a wireless networking company. Mr. Reyes received a B.S. in Economics and
Business Administration from Saint Mary's College in Moraga, California.
    
 
     Paul R. Bonderson, Jr. co-founded Brocade in August 1995 and has served as
Vice President, Engineering since August 1995. From March 1986 to August 1995,
Mr. Bonderson held several engineering positions at Sun Microsystems, Inc., most
recently as Director of Engineering. Mr. Bonderson received a B.S. in Electrical
Engineering from California Polytechnic State University, San Luis Obispo.
 
   
     Michael J. Byrd joined Brocade in April 1999 and became our Vice President,
Finance and Chief Financial Officer effective May 3, 1999. From February 1994 to
April 1999, Mr. Byrd served as Vice President, Finance and Chief Financial
Officer of Maxim Integrated Products, Inc., a designer, developer and
manufacturer of linear and mixed-signal integrated circuits. From 1982 to 1994,
Mr. Byrd held various positions at Ernst & Young, most recently as Partner. Mr.
Byrd received a B.S. in Business Administration from California Polytechnic
State University, San Luis Obispo.
    
 
     Kumar Malavalli co-founded Brocade in August 1995 and has served as our
Vice President, Technology since October 1995. From July 1993 to October 1995,
Mr. Malavalli served as Manager of Architecture and Standards in the Canadian
Network Operation at Hewlett-Packard Company. Mr. Malavalli was a member of the
industry team that originated the Fibre Channel architecture, has helped guide
the technology through the industry standards committees and currently chairs
the ANSI T11 Technical Committee, which oversees all standards related to the
development of Fibre Channel.
 
                                       42
<PAGE>   44
 
From 1993 to 1999, Mr. Malavalli was the chairman of the Fibre Channel
Association Technical Committee. Mr. Malavalli received both a B.S. in Physics
and Mathematics and a B.S. in Electrical Engineering from the University of
Mysore, India.
 
     Victor M. Rinkle has served as our Vice President, Operations since January
1998. From April 1989 to December 1997, Mr. Rinkle held several managerial
positions at Apple Computer, Inc., most recently as Vice President, Global
Supply Base Management. Mr. Rinkle received a B.B.A. in Marketing and Production
Logistics from the University of Houston.
 
     Charles W. Smith has served as our Vice President, Worldwide Sales since
February 1997. From June 1996 to February 1997, Mr. Smith served as Director,
Corporate Account Sales at IBM. From July 1990 to February 1996, Mr. Smith held
various senior sales management positions at Conner Peripherals, Inc., a storage
solutions company, most recently as Vice President, US Sales, Western Region.
Mr. Smith received an A.S. in Aeronautics and Business from the College of San
Mateo and a B.S. in Business Management from San Jose State University.
 
     Peter J. Tarrant has served as our Vice President, Marketing and Business
Development since December 1997. From October 1994 to December 1997, Mr. Tarrant
served as Vice President, Product Management and Vice President, Business
Development at Bay Networks, Inc., a computer networking company. From April
1990 to October 1994, Mr. Tarrant held several product management positions at
SynOptics, a predecessor of Bay Networks, Inc. most recently as Director,
Product Management. Mr. Tarrant received a B.Sc. in Electronic Engineering from
the University of Southampton, United Kingdom.
 
     Seth D. Neiman has served as Chairman of the board of directors of Brocade
since August 1995. Mr. Neiman formerly served as our Chief Executive Officer
from August 1995 to June 1996. Since August 1994, Mr. Neiman has held various
positions at Crosspoint Venture Partners, a venture capital firm, and has been a
partner of Crosspoint since January 1996. From September 1991 to July 1994, Mr.
Neiman was Vice President of Engineering at Coactive Networks, a local area
networks company. Mr. Neiman also serves on the boards of directors and
compensation committees of numerous private companies. Mr. Neiman received a
B.A. in Philosophy from Ohio State University.
 
     Neal Dempsey has served as a director of Brocade since December 1996. Since
May 1989, Mr. Dempsey has been a General Partner of Bay Partners, a venture
capital firm. Mr. Dempsey also serves on the boards of directors and
compensation committees of numerous private companies. Mr. Dempsey received a
B.A. in Business from the University of Washington.
 
   
     Mark Leslie has served as a director of Brocade since January 1999. Mr.
Leslie has served as the Chief Executive Officer and a member of the board of
directors of VERITAS Software Corporation, a storage management software
company, since February 1990. Mr. Leslie also serves on the board of directors
of Versant Object Technology, as well as on the board of directors of a private
company. Mr. Leslie received a B.A. in Physics and Mathematics from New York
University.
    
 
     Larry W. Sonsini has served as a director of Brocade since January 1999.
Mr. Sonsini has been a partner of the law firm of Wilson Sonsini Goodrich &
Rosati, P.C., since 1973 and is currently the Chairman of the Executive
Committee of the firm. Mr. Sonsini serves on numerous advisory boards and
committees, including the SEC's Advisory Committee on Capital Formation and
Regulatory Processes, the ABA Committee on Federal Regulation of Securities and
the Legal Advisory Committee to the Board of Governors, New York Stock Exchange.
Mr. Sonsini serves on the boards of directors of Novell, Inc., Lattice
Semiconductor Corporation and Pixar Animation Studios, as well as on the boards
of directors of several private companies. Mr. Sonsini received an A.B. from the
University of California, Berkeley and an L.L.B. from Boalt Hall School of Law,
University of California, Berkeley.
 
                                       43
<PAGE>   45
 
BOARD OF DIRECTORS
 
   
     Our board of directors currently consists of six authorized members. Upon
the completion of this offering, the terms of office of the board of directors
will be divided into three classes: Class I, whose term will expire at the
annual meeting of stockholders to be held in 2000; Class II, whose term will
expire at the annual meeting of stockholders to be held in 2001; and Class III,
whose term will expire at the annual meeting of the stockholders to be held in
2002. At each annual meeting of stockholders after the initial classification,
the successors to directors whose terms will then expire will be elected to
serve from the time of election and qualification until the third annual meeting
following election. This classification of the board of directors may have the
effect of delaying or preventing a change of control or management of Brocade.
See "Risk Factors -- Provisions in Our Charter Documents, Customer Agreements
and Delaware Law Could Prevent or Delay a Change in Control of Brocade and May
Reduce the Market Price of Our Common Stock." Each officer serves at the
discretion of the board of directors. There are no family relationships among
any of our directors or officers.
    
 
     Board Committees. Our board of directors currently has two committees: an
audit committee and a compensation committee. The audit committee consists of
Mr. Neiman and Mr. Dempsey. The audit committee makes recommendations to our
board of directors regarding the selection of independent auditors, reviews the
results and scope of audit and other services provided by our independent
auditors and reviews the accounting principles and auditing practices and
procedures to be used for the financial statements of Brocade. The compensation
committee consists of Mr. Leslie and Mr. Dempsey. The compensation committee
makes recommendations to our board of directors regarding our stock plans and
the compensation of officers and other managerial employees.
 
   
     Director Compensation. Directors currently do not receive any cash
compensation from Brocade for their services as members of our board of
directors, although we are authorized to pay members for attendance at meetings
or a salary in addition to reimbursement for expenses in connection with
attendance at meetings. Certain non-employee directors have received grants of
options to purchase shares of our common stock. See "Principal Stockholders" and
"Certain Transactions -- Stock Option Grants and Loan to Certain Directors."
Upon and following this offering, certain non-employee directors will receive
automatic option grants under our 1999 Director Option Plan. See "-- Employee
Benefit Plans -- 1999 Director Option Plan."
    
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
     None of the members of the compensation committee is currently or has been,
at any time since the formation of Brocade, an officer or employee of Brocade.
No member of the compensation committee serves as a member of the board of
directors or compensation committee of any entity that has one or more executive
officers serving as a member of our board of directors or compensation
committee.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION
 
     Pursuant to the Delaware General Corporation Law, we have adopted
provisions in our certificate of incorporation and bylaws that limit or
eliminate the personal liability of our directors for a breach of their
fiduciary duty of care as a director. The duty of care generally requires that,
when acting on behalf of the corporation, directors exercise an informed
business judgment based on all material information
 
                                       44
<PAGE>   46
 
reasonably available to them. Consequently, a director will not be personally
liable to us or our stockholders for monetary damages or breach of fiduciary
duty as a director, except for liability for:
 
      --  any breach of the director's duty of loyalty to us or our
          stockholders;
 
      --  acts or omissions not in good faith or that involve intentional
          misconduct or a knowing violation of law;
 
      --  unlawful payments of dividends or unlawful stock repurchases,
          redemptions or other distributions; or
 
      --  any transaction from which the director derived an improper personal
          benefit.
 
   
     Our certificate of incorporation also allows us to indemnify our officers,
directors and other agents to the full extent permitted by Delaware law. We
intend to enter into indemnification agreements with each of our directors and
officers that will give them additional contractual reassurances regarding the
scope of indemnification and that may provide additional procedural protection.
The indemnification agreements require actions such as:
    
 
      --  indemnifying officers and directors against certain liabilities that
          may arise because of their status as officers or directors;
 
      --  advancing expenses, as incurred, to officers and directors in
          connection with a legal proceeding, subject to certain limited
          exceptions; or
 
      --  obtaining directors' and officers' insurance.
 
     The limited liability and indemnification provisions in our certificate of
incorporation and bylaws may discourage stockholders from bringing a lawsuit
against our directors for breach of their fiduciary duty and may reduce the
likelihood of derivative litigation against our directors and officers, even
though a derivative action, if successful, might otherwise benefit us and our
stockholders. Moreover, a stockholder's investment in Brocade may be adversely
affected to the extent we pay the costs of settlement or damage awards against
our directors and officers under these indemnification provisions.
 
     At present, there is no pending litigation or proceeding involving any of
our directors, officers or employees in which indemnification is sought, nor are
we aware of any threatened litigation that may result in claims for
indemnification.
 
                                       45
<PAGE>   47
 
EXECUTIVE COMPENSATION
 
     The following table sets forth information for fiscal 1998, concerning the
compensation paid to our Chief Executive Officer, our former Chief Executive
Officer and our four other most highly compensated executive officers whose
total salary and bonus for such fiscal year exceeded $100,000, collectively
referred to below as the Named Executive Officers. The entries under the column
heading "Other Compensation" in the table represent the cost of term life
insurance for each Named Executive Officer.
 
                           SUMMARY COMPENSATION TABLE
 
   
<TABLE>
<CAPTION>
                                                                                 LONG-TERM
                                                                                COMPENSATION
                                                                                   AWARDS
                                                                                ------------
                                                        ANNUAL COMPENSATION      SECURITIES
                                                       ----------------------    UNDERLYING       ALL OTHER
             NAME AND PRINCIPAL POSITION               SALARY ($)   BONUS ($)    OPTIONS(#)    COMPENSATION($)
             ---------------------------               ----------   ---------   ------------   ---------------
<S>                                                    <C>          <C>         <C>            <C>
Gregory L. Reyes
  President and Chief Executive Officer(1)...........   $ 60,606     $    --     1,535,662         $   480
Bruce L. Bergman
  President and Chief Executive Officer(1)...........    225,000          --            --           1,620
Kumar Malavalli
  Vice President, Technology.........................    162,840      13,027            --           1,188
Paul R. Bonderson, Jr.
  Vice President, Engineering........................    161,927      12,375            --           1,188
Victor M. Rinkle
  Vice President, Operations.........................    115,340      39,375       200,000             990
Charles W. Smith
  Vice President, Worldwide Sales....................    118,500          --        35,000          87,306(2)
</TABLE>
    
 
- -------------------------
(1) Mr. Bergman served as our President and Chief Executive Officer until June
    1998. Mr. Reyes became our President and Chief Executive Officer effective
    July 1998 at an annual salary of $200,000.
(2) Also includes amounts earned by Mr. Smith as commissions.
 
OPTION GRANTS IN LAST FISCAL YEAR
 
     The following table sets forth certain information for each grant of stock
options during fiscal 1998, to each of the Named Executive Officers. All of
these options granted by us were granted under the 1995 Equity Incentive Plan,
the 1998 Equity Incentive Plan or the 1998 Executive Equity Incentive Plan and
have a term of 10 years, subject to earlier termination in the event the
optionee's services to Brocade cease. See "-- Employee Benefit Plans" for
descriptions of the material terms of these options. Each of these options has
been exercised in conjunction with a promissory note and a stock pledge
agreement. See "Certain Transactions" for descriptions of these exercises.
 
     During fiscal 1998, we granted options to purchase a total of 3,154,912
shares of common stock under the 1995 Equity Incentive Plan, the 1998 Equity
Incentive Plan and the 1998 Executive Equity Incentive Plan. Options were
granted at an exercise price equal to the fair market value of our common stock,
as determined in good faith by our board of directors. Our board of directors
determined the fair market value based on:
 
      --  our financial results and prospects;
 
      --  the share price derived for arms-length transactions; and
 
      --  evaluations conducted by valuation experts.
 
                                       46
<PAGE>   48
 
     Potential realizable values for the following table are:
 
      --  net of exercise price before taxes;
 
      --  based on the assumption that our common stock appreciates at the
          annual rate shown, compounded annually, from the date of grant until
          the expiration of the ten-year term; and
 
      --  based on the assumption that the option is exercised at the exercise
          price and sold on the last day of its term at the appreciated price.
 
These numbers are calculated based on Securities and Exchange Commission
requirements and do not reflect our projection or estimate of future stock price
growth. No stock appreciation rights were granted during the fiscal year.
 
   
     Each of the options listed in the table below has been exercised, but the
shares purchased under those options are subject to repurchase by us at the
original exercise price paid per share upon the optionee's cessation of service
with us prior to vesting of the shares. The repurchase right lapses and the
optionee vests as to 25% of the option shares upon completion of one year of
service from the date of grant and the balance in a series of equal monthly
installments over the next three years of service. In the event of a termination
without cause or constructive termination other than for cause at any time
during the first year following a change of control, these options will fully
vest. See "-- Change of Control and Severance Arrangements."
    
 
<TABLE>
<CAPTION>
                                                         INDIVIDUAL GRANTS
                                          ------------------------------------------------    POTENTIAL REALIZABLE
                                                       PERCENT OF                               VALUE AT ASSUMED
                                            NUMBER       TOTAL                                   ANNUAL RATES OF
                                              OF        OPTIONS                                    STOCK PRICE
                                          SECURITIES   GRANTED TO   EXERCISE                    APPRECIATION FOR
                                          UNDERLYING   EMPLOYEES    PRICE PER                      OPTION TERM
                                           OPTIONS     IN FISCAL      SHARE     EXPIRATION   -----------------------
                  NAME                     GRANTED        1998      ($/SHARE)      DATE          5%          10%
                  ----                    ----------   ----------   ---------   ----------   ----------   ----------
<S>                                       <C>          <C>          <C>         <C>          <C>          <C>
Gregory L. Reyes........................  1,535,662       48.7%       $2.25      10/08/08    $2,172,982   $5,506,762
Bruce L. Bergman........................         --         --           --            --            --           --
Kumar Malavalli.........................         --         --           --            --            --           --
Paul R. Bonderson, Jr...................         --         --           --            --            --           --
Victor M. Rinkle........................    200,000        6.3         2.25      02/25/08       283,003      717,184
Charles W. Smith........................     35,000        1.1         2.25      10/08/08        49,525      125,507
</TABLE>
 
                                       47
<PAGE>   49
 
AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR AND FISCAL YEAR-END OPTION
VALUES
 
   
     The following table sets forth information with respect to the Named
Executive Officers concerning exercisable and unexercisable options held as of
October 31, 1998. Each of the options listed in the table below has been
exercised, but any shares purchased under those options will be subject to
repurchase by us at the original exercise price paid per share upon the
optionee's cessation of service with us prior to the vesting of the shares. The
heading "Vested" refers to shares no longer subject to repurchase; the heading
"Unvested" refers to shares subject to repurchase as of October 31, 1998. The
value of in-the-money options is based on an assumed offering price of $9.00 per
share and net of the option exercise price.
    
 
   
<TABLE>
<CAPTION>
                                                                  NUMBER OF SECURITIES           VALUE OF UNEXERCISED
                                                                 UNDERLYING UNEXERCISED              IN-THE-MONEY
                                  SHARES                       OPTIONS AT OCTOBER 31, 1998    OPTIONS AT OCTOBER 31, 1998
                               ACQUIRED ON        VALUE        ---------------------------    ---------------------------
            NAME               EXERCISE (#)    REALIZED ($)     VESTED          UNVESTED        VESTED        UNVESTED
            ----               ------------    ------------    ---------      ------------    ----------    -------------
<S>                            <C>             <C>             <C>            <C>             <C>           <C>
Gregory L. Reyes.............         --         $    --             --         1,535,662      $     --      $10,365,719
Bruce L. Bergman.............         --              --             --                --            --               --
Kumar Malavalli..............         --              --             --                --            --               --
Paul R. Bonderson, Jr. ......         --              --             --                --            --               --
Victor M. Rinkle.............         --              --             --           200,000            --        1,350,000
Charles W. Smith.............     25,000          30,000(1)      47,917           112,083       415,003          901,247
</TABLE>
    
 
- -------------------------
   
(1) Based on a price of $1.80 per share, the fair market value of our common
    stock at January 13, 1998, as determined by our board of directors, and net
    of the option exercise price.
    
 
   
CHANGE OF CONTROL AND SEVERANCE ARRANGEMENTS
    
 
   
     Options granted to certain of our officers and directors under our 1995
Equity Incentive Plan, 1998 Equity Incentive Plan and 1998 Executive Equity
Incentive Plan will vest fully in the event that these individuals are
terminated without cause or are constructively terminated at any time during the
first year following a change of control of Brocade.
    
 
     Mr. Reyes's option agreement under the 1998 Equity Incentive Plan provides
that if, during the first year of his employment, he is terminated other than:
 
      --  constructively or without cause during the first year following a
          change of control; or
 
      --  for cause,
 
Mr. Reyes will vest as to 191,958 shares plus a number of shares equal to 31,993
multiplied by the number of full months of his service to us. If Mr. Reyes is
terminated any time after the first year of his employment, other than:
 
      --  constructively or without cause during the first year following a
          change of control; or
 
      --  for cause,
 
Mr. Reyes will vest as to 191,958 shares in addition to any shares that have
vested under the normal four-year vesting schedule contemplated by the
agreement. Moreover, upon a change of control, one-half of Mr. Reyes's unvested
shares vest in addition to any shares that have vested under the normal
four-year vesting schedule contemplated by the agreement, and if Mr. Reyes is
constructively terminated or terminated without cause during the first year
following the change of control, then all of his unvested shares subject to this
option will vest.
 
     Mr. Reyes's option agreement under the 1998 Executive Equity Incentive Plan
provides that if he is terminated at any time on or after May 13, 2001, other
than:
 
                                       48
<PAGE>   50
 
      --  constructively or without cause during the first year following a
          change of control; or
 
      --  for cause,
 
then, in addition to any shares that have vested under the normal four-year
vesting schedule contemplated by the agreement, 191,958 additional shares will
vest, less the number of shares that may vest as a result of his termination
under the 1998 Equity Incentive Plan as described above. In addition, upon a
change of control, one-half of Mr. Reyes's unvested shares vest in addition to
any shares that have vested under the normal four-year vesting schedule
contemplated by the agreement, and if Mr. Reyes is constructively terminated or
terminated without cause during the first year following the change of control,
then, all of his unvested shares subject to this option will vest.
 
     In addition, pursuant to a letter agreement, if Mr. Reyes is constructively
terminated or terminated without cause upon a change of control, he will receive
a severance payment of one year of his base salary plus his expected bonus for
the then current fiscal year under the 1999 Key Employee Incentive Program, as
described below.
 
   
     We have entered into a Confidential Agreement and General Release of Claims
with Mr. Bergman, effective as of September 23, 1998. This agreement outlines
the terms governing Mr. Bergman's termination as our President and Chief
Executive Officer, as a member of our board of directors and as a consultant to
Brocade. In exchange for and pursuant to the agreement, we agreed to provide Mr.
Bergman with the following severance benefits for one year following his
termination date:
    
 
      --  base salary at his then current rate;
 
      --  existing employee health benefits insurance; and
 
      --  continued vesting of 16,115 shares per month of Mr. Bergman's unvested
          shares of our common stock, until the complete vesting of his 773,528
          total shares occurs.
 
The agreement also includes a release of claims relating to or arising from Mr.
Bergman's relationship with Brocade and the continued obligation of
confidentiality with regard to our proprietary information.
 
   
EMPLOYEE BENEFIT PLANS
    
 
     Upon the completion of this offering, our 1995 Equity Incentive Plan, our
1998 Equity Incentive Plan and our 1998 Executive Equity Incentive Plan will be
combined and continue as our 1999 Stock Plan. No additional options will be
granted under the 1995 Equity Incentive Plan, the 1998 Equity Incentive Plan or
the 1998 Executive Equity Incentive Plan after the completion of this offering.
However, the terms and conditions of the options granted previously under these
plans will continue to govern those outstanding options. Therefore, descriptions
of these plans, in addition to a description of the 1999 Stock Plan, are
provided below.
 
     AMENDED 1995 EQUITY INCENTIVE PLAN
 
     Our Amended 1995 Equity Incentive Plan was adopted by our board of
directors in August 1995, was subsequently approved by our stockholders, and has
been amended from time to time. The 1995 Plan provides for the grant of
incentive stock options, within the meaning of Section 422 of the Internal
Revenue Code of 1986, to employees and for the grant of nonstatutory stock
options to employees, non-employee directors and consultants. A total of
3,807,000 shares of common stock has been reserved for issuance under the 1995
Plan.
 
                                       49
<PAGE>   51
 
     The 1995 Plan is administered by our board of directors or a committee of
the board. Subject to the provisions of the 1995 Plan, our board of directors or
committee has the authority to select the persons to whom options are granted
and determine the terms of each option, including:
 
      --  the number of shares of common stock covered by the option;
 
      --  when the option becomes exercisable;
 
      --  the per share option exercise price which, in the case of incentive
          stock options, must be at least 100% of the fair market value of a
          share of common stock as of the date of grant; in the case of options
          granted to persons who own 10% or more of the total combined voting
          power of Brocade or any parent or subsidiary of Brocade, must be at
          least 110% of the fair market value of a share of common stock as of
          the date of grant; and, in the case of nonstatutory stock options,
          must be at least 85% of the fair market value of a share of common
          stock as of the date of the grant; and
 
      --  the duration of the option, which may not exceed 10 years, or five
          years for incentive stock options granted to 10% stockholders.
 
     Generally, options granted under the 1995 Plan vest over four years and are
non-transferable other than by will or the laws of descent and distribution. In
the event of certain changes in control of Brocade, the acquiring or successor
corporation may assume or substitute for options outstanding under the 1995
Plan, or such options shall terminate. Certain options granted to certain of our
officers provide for partial acceleration upon a change of control of Brocade.
See "-- Change of Control and Severance Arrangements."
 
     1998 EQUITY INCENTIVE PLAN
 
     Our 1998 Equity Incentive Plan was adopted by our board of directors in
February 1998 and subsequently approved by the stockholders. The 1998 Plan
provides for the grant of incentive stock options, within the meaning of Section
422, of the Code to employees and for the grant of nonstatutory stock options to
employees, non-employee directors and consultants. A total of 3,200,000 shares
of common stock has been reserved for issuance under the 1998 Plan.
 
     The 1998 Plan is administered by our board of directors or a committee of
the board. Subject to the provisions of the 1998 Plan, our board of directors or
committee has the authority to select the persons to whom options are granted
and determine the terms of each option, including:
 
      --  the number of shares of common stock covered by the option;
 
      --  when the option becomes exercisable;
 
      --  the per share option exercise price which, in the case of incentive
          stock options, must be at least 100% of the fair market value of a
          share of common stock as of the date of grant; in the case of options
          granted to 10% stockholders, must be at least 110% of the fair market
          value of a share of common stock as of the date of grant; and, in the
          case of nonstatutory stock options, must be at least 85% of the fair
          market value of a share of common stock as of the date of the grant;
          and
 
      --  the duration of the option, which may not exceed 10 years, or five
          years for incentive stock options granted to 10% stockholders.
 
Generally, options granted under the 1998 Plan vest over four years and are
non-transferable other than by will or the laws of descent and distribution. In
the event of certain changes in control of Brocade, the acquiring or successor
corporation may assume or substitute for options outstanding under the 1998
Plan, or such options shall terminate. Certain options granted to certain of our
officers provide for partial
 
                                       50
<PAGE>   52
 
acceleration upon a change of control of Brocade. See "-- Change of Control and
Severance Arrangements."
 
     1998 EXECUTIVE EQUITY INCENTIVE PLAN
 
     Our 1998 Executive Equity Incentive Plan was adopted by our board of
directors in October 1998. The 1998 Executive Plan provides for the grant of
nonqualified stock options to executives. A total of 300,000 shares of common
stock has been reserved for issuance under the 1998 Executive Plan.
 
     The 1998 Executive Plan is administered by the board of directors or a
committee of the board. Subject to the provisions of the 1998 Executive Plan,
the board or committee has the authority to select the persons to whom options
are granted and determine the terms of each option, including:
 
      --  the number of shares of common stock covered by the option;
 
      --  when the option becomes exercisable;
 
      --  the per share option exercise price, which must be at least 85% of the
          fair market value of a share of common stock as of the date of grant;
          and
 
      --  the duration of the option, which may not exceed 10 years from the
          date an option is granted.
 
In the event of certain changes in control of Brocade, the acquiring or
successor corporation may assume or substitute for options outstanding under the
1998 Executive Plan, or such options shall terminate. Certain options granted to
officers of Brocade provide for partial acceleration upon a change in control of
Brocade.
 
     To date, there has been only one option grant under the 1998 Executive
Plan, to Mr. Reyes, for all of the options currently outstanding under the 1998
Executive Plan. Such option vests as to 31,993 shares on November 13, 2001, and
as to 31,993 shares upon the expiration of each full month elapsed thereafter.
Mr. Reyes's option under the 1998 Executive Plan also provides for partial or
full acceleration under certain circumstances. See "-- Change of Control and
Severance Arrangements."
 
     1999 STOCK PLAN
 
   
     Our 1999 Stock Plan was adopted by our board of directors in March 1999 and
was approved by our shareholders in April 1999, and will be effective upon the
completion of this offering. The 1999 Plan provides for the grant of incentive
stock options, within the meaning of Section 422 of the Code, to employees. The
1999 Plan has provisions for compliance with the $1,000,000 limit set by the
Internal Revenue Service.
    
 
     Initially, 7,607,000 shares of common stock will be reserved for issuance
under the 1999 Plan. These shares consist of the total number of shares
currently reserved under the 1995 Plan, the 1998 Plan, the 1998 Executive Plan
and 300,000 newly reserved shares. An annual increase will be added on the first
day of our fiscal year beginning in 1999 equal to the lesser of:
 
      --  5,000,000 shares;
 
      --  5% of the outstanding shares on that date; or
 
      --  a lesser amount determined by the board of directors.
 
                                       51
<PAGE>   53
 
     The 1999 Plan will be administered by our board of directors or a committee
of the board. Subject to the provisions of the 1999 Plan, the board or committee
will have the authority to select the persons to whom options are granted and
determine the terms of each option, including:
 
      --  the number of shares of common stock covered by the option;
 
      --  when the option becomes exercisable;
 
      --  the per share option exercise price which must be at least 100% of the
          fair market value of a share of common stock as of the date of grant,
          and which, in the case of options granted to 10% stockholders, must be
          at least 110% of the fair market value of a share of common stock as
          of the date of grant; and
 
      --  the duration of the option, which may not exceed 10 years, or five
          years for options granted to 10% stockholders.
 
     Generally, options granted under the 1999 Plan will vest over four years,
and will be non-transferable other than by will or the laws of descent and
distribution. In the event of certain changes in control of Brocade, the
acquiring or successor corporation may assume or substitute for options
outstanding under the 1999 Plan, or such options shall terminate.
 
     1999 EMPLOYEE STOCK PURCHASE PLAN
 
   
     Our 1999 Employee Stock Purchase Plan was adopted in March 1999 and was
approved by our shareholders in April 1999, and will be effective upon the
completion of this offering. Initially, 200,000 shares of common stock will be
reserved for issuance under the Purchase Plan. An annual increase will be added
on the first day of our fiscal year beginning in 2000 equal to the lesser of:
    
 
      --  2,500,000 shares;
 
      --  2.5% of the outstanding shares on that date; or
 
      --  a lesser amount determined by the board of directors.
 
     The Purchase Plan, which is intended to qualify under Section 423 of the
Code, will be administered by the board of directors or by a committee of the
board. Our employees, including officers and directors of Brocade who are also
employees, or any subsidiary designated by the board of directors for
participation in the Purchase Plan are eligible to participate in the Purchase
Plan if they are customarily employed for more than 20 hours per week and more
than five months per year. The Purchase Plan will be implemented by consecutive
offering periods generally six months in duration. However, the first offering
period under the Purchase Plan will commence on the effective date of this
offering and terminate on or before November 30. The board of directors may
change the dates or duration of one or more offering periods.
 
     The Purchase Plan permits our eligible employees to purchase shares of
common stock through payroll deductions at 85% of the lower of the fair market
value of the common stock on the first day of the offering period or a specified
exercise date. Participants generally may not purchase shares on any exercise
date or stock, to the extent that, immediately after the grant, the participant
would own stock or options to purchase stock totaling 5% or more of the total
combined voting power of all stock of Brocade, or greater than $25,000 worth of
our stock in any calendar year. In addition, no more than 3,000 shares may be
purchased by any participant during any offering period. In the event of a sale
or merger of Brocade, the board may accelerate the exercise date of the current
purchase period to a date prior to the change of control, or the acquiring
corporation may assume or replace the outstanding purchase rights under the
Purchase Plan.
 
                                       52
<PAGE>   54
 
     1999 DIRECTOR OPTION PLAN
 
   
     Our 1999 Director Option Plan was adopted in March 1999 and was approved by
our shareholders in April 1999, and will be effective upon the completion of
this offering. Initially, a total of 200,000 shares of common stock will be
reserved for issuance under the Director Plan. Non-employee directors are
entitled to participate in the 1999 Director Option Plan. However, Mr. Leslie
and Mr. Sonsini will be excluded from receiving option grants under the Director
Plan for three years.
    
 
     The Director Plan provides for the automatic grant of 2,500 shares of
common stock to each non-employee director on the date on which such person
first becomes a non-employee director. After the first 2,500 share option is
granted to the non-employee director, he or she shall automatically be granted
an option to purchase 2,500 shares each quarter of each year, provided that he
or she shall have served on the board for at least the preceding month. Each
option shall have a term of 10 years. Each option granted under the Director
Plan will be fully vested and 100% exercisable on the date of grant. The
exercise price of all options shall be 100% of the fair market value per share
of the common stock, generally determined with reference to the closing price of
the common stock as reported on the Nasdaq National Market on the date of grant.
 
     In the event of a merger, or the sale of substantially all of the assets of
Brocade and if the option is not assumed or substituted, the option will
terminate unless exercised. Options granted under the Director Plan must be
exercised within three months of the end of the optionee's tenure as a director
of Brocade, or within 12 months after such director's termination by death or
disability, but not later than the expiration of the option's ten-year term.
 
   
     1999 KEY EMPLOYEE INCENTIVE PROGRAM
    
 
   
     We have adopted the 1999 Key Employee Incentive Program, an executive bonus
program, pursuant to which selected key employees of Brocade are eligible for
quarterly and annual cash bonuses based upon achieving specified individual and
company-wide objectives, including revenue targets.
    
 
   
     For Mr. Smith, bonuses are not based on the 1999 Key Employee Incentive
Program, but rather on the achievement of sales revenue and other specified
sales objectives.
    
 
     401(K) PLAN
 
     Brocade provides a tax-qualified employee savings and retirement plan which
covers our eligible employees. Pursuant to the 401(k) Plan, employees may elect
to reduce their current annual compensation up to the lesser of 20% or the
statutorily prescribed limit, which was $10,000 in calendar year 1999, and have
the amount of such reduction contributed to the 401(k) Plan. The 401(k) Plan is
intended to qualify under Sections 401(a) and 401(k) of the Code, so that
contributions by us or our employees to the 401(k) Plan, and income earned on
Plan contributions, are not taxable to employees until withdrawn from the 401(k)
Plan, and so that contributions will be deductible by Brocade when made. The
trustee of the 401(k) Plan invests the assets of the 401(k) Plan in the various
investment options as directed by the participants.
 
                                       53
<PAGE>   55
 
                              CERTAIN TRANSACTIONS
 
     Since Brocade's inception in August 1995, there has not been nor is there
currently proposed any transaction or series of similar transactions to which
Brocade was or is to be a party in which the amount involved exceeds $60,000 and
in which any director, executive officer, holder of more than 5% of the common
stock of Brocade or any member of the immediate family of any of the foregoing
persons had or will have a direct or indirect material interest other than (1)
compensation agreements and other arrangements, which are described where
required in "Management," and (2) the transactions described below.
 
TRANSACTIONS WITH DIRECTORS, EXECUTIVE OFFICERS AND 5% STOCKHOLDERS
 
     Common Stock. On August 25, 1995, we issued the following shares of common
stock at a price of $0.10 per share to our founders, all of which were purchased
with promissory notes subsequently forgiven and ratified by our board of
directors on April 24, 1997.
 
<TABLE>
<CAPTION>
                    PURCHASER                       SHARES OF COMMON STOCK
                    ---------                       ----------------------
<S>                                                 <C>
Kumar Malavalli...................................          182,000
Paul R. Bonderson, Jr.............................          227,500
Seth D. Neiman....................................          113,750
</TABLE>
 
     Series A Preferred Stock. On August 28, 1995, Brocade sold 1,425,000 shares
of its Series A Preferred Stock for $1.00 per share. The purchasers of the
Series A Preferred Stock were:
 
<TABLE>
<CAPTION>
                     PURCHASER                       SHARES OF SERIES A STOCK
                     ---------                       ------------------------
<S>                                                  <C>
Crosspoint 1993 Entrepreneurs Fund.................            43,094
Crosspoint Venture Partners 1993...................         1,381,906
</TABLE>
 
     Crosspoint 1993 Entrepreneurs Fund and Crosspoint Venture Partners 1993 are
affiliated entities and together are considered a greater than 5% stockholder of
Brocade. Mr. Neiman, a director of Brocade, is a partner of Crosspoint 1993
Entrepreneurs Fund and Crosspoint Venture Partners 1993. Mr. Neiman disclaims
beneficial ownership of the securities held by such entities, except for his
proportional interest in the entities.
 
     Series B Preferred Stock. On June 17, 1996, Brocade sold 816,250 shares of
its Series B Preferred Stock for $4.00 per share. The purchasers of the Series B
Preferred Stock included, among others:
 
<TABLE>
<CAPTION>
                     PURCHASER                       SHARES OF SERIES B STOCK
                     ---------                       ------------------------
<S>                                                  <C>
Crosspoint Venture Partners 1993...................            56,250
MDV IV Entrepreneurs' Network Fund, L.P. ..........            25,000
Mohr, Davidow Ventures IV..........................           600,000
TPK Unitrust.......................................            25,000
</TABLE>
 
     MDV IV Entrepreneurs' Network Fund, L.P. and Mohr, Davidow Ventures IV are
affiliated entities and together are considered a greater than 5% stockholder of
Brocade. Andreas V. Bechtolsheim, a greater than 5% stockholder of Brocade, is
the trustee of TPK Unitrust.
 
                                       54
<PAGE>   56
 
     Series C Preferred Stock. On December 6, 1996, Brocade sold 3,333,333
shares of its Series C Preferred Stock for $3.00 per share. The purchasers of
the Series C Preferred Stock included, among others:
 
<TABLE>
<CAPTION>
                         PURCHASER                           SHARES OF SERIES C STOCK
                         ---------                           ------------------------
<S>                                                          <C>
Bay Partners SBIC, L.P. ...................................           666,667
Andreas V. Bechtolsheim....................................         1,000,000
Crosspoint 1993 Entrepreneurs' Fund........................             8,854
Crosspoint Venture Partners 1993...........................           283,932
MDV IV Entrepreneurs' Network Fund, L.P. ..................            13,164
Mohr, Davidow Ventures IV, L.P.............................           315,959
TPK Unitrust...............................................            13,164
</TABLE>
 
     Mr. Dempsey, a director of Brocade, is a general partner of Bay Partners
SBIC, L.P. Mr. Dempsey disclaims beneficial ownership of the securities held by
such entity, except for his proportional interest in the entities.
 
     Series D Preferred Stock. On September 29, 1997, November 17, 1997 and
December 3, 1997, Brocade sold 3,660,900 shares of its Series D Preferred Stock
for $5.78 per share. The holders of the Series D Preferred Stock include, among
others:
 
<TABLE>
<CAPTION>
                         PURCHASER                           SHARES OF SERIES D STOCK
                         ---------                           ------------------------
<S>                                                          <C>
Bay Partners SBIC, L.P. ...................................           129,758
Andreas V. Bechtolsheim....................................           105,650
Crosspoint Venture Partners LS Fund 1997...................           570,821
Weiss, Peck & Greer Venture Associates IV Cayman, L.P. Bank
  America Trust & Banking Corporation (Cayman) Limited.....            77,509
Weiss, Peck & Greer Venture Associates IV, L.P. ...........           596,453
WPG Information Sciences Entrepreneur Fund, L.P. ..........            20,762
WPG Enterprise Fund III, L.P. .............................           537,111
</TABLE>
 
     Weiss, Peck & Greer Venture Associates IV Cayman, L.P. Bank America Trust &
Banking Corporation (Cayman) Limited, Weiss, Peck & Greer Venture Associates IV,
L.P., WPG Information Sciences Entrepreneur Fund, L.P. and WPG Enterprise Fund
III, L.P. are affiliated entities and together are considered a greater than 5%
stockholder of Brocade.
 
     Also on September 29, 1997, in connection with our Series D Preferred Stock
financing, we issued the following warrants to purchase our Series D Preferred
Stock at an exercise price of $6.78 per share:
 
<TABLE>
<CAPTION>
                                                               WARRANTS TO PURCHASE
                         PURCHASER                                SERIES D STOCK
                         ---------                             --------------------
<S>                                                          <C>
Bay Partners SBIC, L.P. ...................................            11,418
Weiss, Peck & Greer Venture Associates IV Cayman, L.P. Bank
  America Trust & Banking Corporation (Cayman) Limited.....             7,750
Weiss, Peck & Greer Venture Associates IV, L.P. ...........            59,645
WPG Information Sciences Entrepreneur Fund, L.P. ..........             2,076
WPG Enterprise Fund III, L.P. .............................            53,711
</TABLE>
 
LOANS TO CERTAIN EXECUTIVE OFFICERS
 
     On April 11, 1997, we loaned $30,000 to Charles W. Smith, our Vice
President, Worldwide Sales, secured by a stock pledge agreement, in connection
with his purchase of 100,000 shares of our common
 
                                       55
<PAGE>   57
 
stock for $.30 per share. This note accrues interest at the rate of 6.5% per
annum, compounded semi-annually, and is due on February 27, 2001. On January 13,
1998, we loaned $15,000 to Mr. Smith, secured by a stock pledge agreement, in
connection with his purchase of 25,000 shares of our common stock for $.60 per
share. This note accrues interest at the rate of 6.5% per annum, compounded
semi-annually, and is due on January 13, 2003. On December 26, 1998, we loaned
$78,750 to Mr. Smith, secured by a stock pledge agreement, in connection with
his purchase of 35,000 shares of our common stock for $2.25 per share. This note
accrues interest at the rate of 5% per annum, compounded semi-annually, and is
due on January 15, 2003. On January 25, 1999, we loaned $78,750 to Mr. Smith,
secured by a stock pledge agreement, in connection with his purchase of 35,000
shares of our common stock for $2.25 per share. This note accrues interest at
the rate of 5% per annum, compounded semi-annually, and is due on December 31,
2003. The principal amounts and accrued interest on all notes remain
outstanding.
 
     On April 11, 1997, we loaned $45,000 to B. Carl Lee, our former Vice
President, Finance and Chief Financial Officer, secured by a stock pledge
agreement, in connection with his purchase of 150,000 shares of our common stock
for $0.30 per share. This note accrues interest at the rate of 6.5% per annum,
compounded semi-annually, and is due on December 2, 2001. On December 31, 1998,
we loaned $112,500 to Mr. Lee, secured by a stock pledge agreement, in
connection with his purchase of 50,000 shares of our common stock for $2.25 per
share. This note accrues interest at the rate of 6.5% per annum, compounded
semi-annually, and is due on December 31, 2003. The principal amounts and
accrued interest on both notes remain outstanding.
 
     On January 26, 1998, we loaned $360,000 to Peter J. Tarrant, our Vice
President, Marketing and Business Development, secured by a stock pledge
agreement, in connection with his purchase of 200,000 shares of our common stock
for $1.80 per share. This note accrues interest at the rate of 6.5% per annum,
compounded semi-annually, and is due on January 26, 2003. The principal amount
and accrued interest on this note remain outstanding.
 
     On December 8, 1998, we loaned $647,853.75 to Gregory L. Reyes, our
President and Chief Executive Officer, secured by a stock pledge agreement, in
connection with his purchase of 287,935 shares of our common stock for $2.25 per
share. This note accrues interest at the rate of 4.47% per annum, compounded
semi-annually, and is due one year after the date of this offering. Also on
December 8, 1998, we loaned $2,807,385.75 to Mr. Reyes, secured by a stock
pledge agreement, in connection with his purchase of 1,247,727 shares of our
common stock for $2.25 per share. This note accrues interest at the rate of
4.47% per annum, compounded semi-annually, and is due one year after the date of
this offering. The principal amounts and accrued interest on both notes remain
outstanding.
 
     On December 24, 1998, we loaned $450,000 to Victor M. Rinkle, our Vice
President, Operations, secured by a stock pledge agreement, in connection with
his purchase of 200,000 shares of our common stock for $2.25 per share. This
note accrues interest at the rate of 6.5% per annum, compounded semi-annually,
and is due on December 24, 2004. The principal amount and accrued interest on
this note remain outstanding.
 
   
     On April 1, 1999, we loaned $1,650,000 to Michael J. Byrd, our new Vice
President, Finance and Chief Financial Officer. The loan is secured by a stock
pledge agreement, in connection with his purchase of 330,000 shares of our
common stock pursuant to a nonqualified stock option for $5.00 per share. The
note accrues interest at the rate of 5.21% per annum, compounded semi-annually,
and is due on April 1, 2006.
    
 
   
     On April 21, 1999, we loaned $100,000 to Paul R. Bonderson, Jr., our Vice
President, Engineering. The loan is secured by a stock pledge agreement. This
note accrues interest at the rate of 5.21% per annum, compounded semi-annually,
and is due on April 21, 2004.
    
 
                                       56
<PAGE>   58
 
STOCK OPTION GRANTS AND LOAN TO CERTAIN DIRECTORS
 
   
     On January 6, 1999, we granted to Mark Leslie, a director of Brocade, a
fully vested stock option to purchase 121,856 shares of our common stock at
$2.25 per share. On January 28, 1999, we loaned $274,176 to Mr. Leslie, secured
by a stock pledge agreement, in connection with his purchase of 121,856 shares
of our common stock for $2.25 per share. This note accrues interest at the rate
of 4.59% per annum, compounded semi-annually, and is due on January 28, 2000.
The principal amount and accrued interest on this note remain outstanding.
    
 
   
     On January 29, 1999, we granted to Larry W. Sonsini, a director of Brocade,
a fully vested stock option to purchase 121,856 shares of our common stock at
$5.00 per share. Mr. Sonsini is also a partner of Wilson Sonsini Goodrich &
Rosati, P.C., a law firm, to whom we have paid legal fees in connection with
this offering.
    
 
INDEMNIFICATION
 
   
     We intend to enter into indemnification agreements with each of our
directors and officers. Such indemnification agreements will require us to
indemnify our directors and officers to the fullest extent permitted by Delaware
law. See "-- Limitation of Liability and Indemnification."
    
 
CONFLICT OF INTEREST POLICY
 
     Brocade believes that all transactions with affiliates described above were
made on terms no less favorable to Brocade than could have been obtained from
unaffiliated third parties. Brocade's policy is to require that a majority of
the independent and disinterested outside directors on our board of directors
approve all future transactions between Brocade and its officers, directors,
principal stockholders and their affiliates. Such transactions will continue to
be on terms no less favorable to Brocade than it could obtain from unaffiliated
third parties.
 
                                       57
<PAGE>   59
 
                             PRINCIPAL STOCKHOLDERS
 
   
     The following table sets forth certain information concerning the
beneficial ownership of our common stock as of April 30, 1999, and as adjusted
to reflect the sale of the shares of common stock in this offering by:
    
 
      --  each person who is known by Brocade to beneficially own more then 5%
          of our common stock;
 
      --  each of the Named Executive Officers;
 
      --  each of our directors; and
 
      --  all officers and directors as a group.
 
   
     Unless otherwise indicated, the address of each listed stockholder is c/o
Brocade Communications Systems, Inc., 1901 Guadalupe Parkway, San Jose, CA
95131. The number and percentage of shares beneficially owned are based on
22,361,592 shares of common stock outstanding as of April 30, 1999, assuming
conversion of all outstanding shares of preferred stock into common stock, and
25,685,291 shares of common stock outstanding after the completion of this
offering, assuming the Underwriters' over-allotment option to purchase 487,500
shares of common stock is not exercised. Beneficial ownership is determined
under the rules and regulations of the Securities and Exchange Commission.
Shares of common stock subject to options or warrants that are currently
exercisable or exercisable within 60 days of April 30, 1999 are deemed to be
outstanding and beneficially owned by the person holding the options or warrants
for the purpose of computing the number of shares beneficially owned and the
percentage ownership of that person. The shares subject to options or warrants
held by a person are not deemed to be outstanding for the purpose of computing
the percentage ownership of any other person. Except as indicated in the
footnotes to this table, and subject to applicable community property laws, the
persons named in the table have sole voting and investment power with respect to
all shares of Brocade's common stock shown as beneficially owned by them.
Percentage ownership figures after the offering do not include shares that may
be purchased by each person in the offering. Entries denoted by an asterisk
represent an amount less than 1%.
    
 
   
<TABLE>
<CAPTION>
                                                                                       PERCENT OF SHARES
                                                                                       BENEFICIALLY OWNED
                                                                                     ----------------------
                                                    NUMBER OF SHARES BENEFICIALLY    BEFORE THE   AFTER THE
       NAME AND ADDRESS OF BENEFICIAL OWNER           OWNED BEFORE THE OFFERING       OFFERING    OFFERING
       ------------------------------------         -----------------------------    ----------   ---------
<S>                                                 <C>                              <C>          <C>
NAMED EXECUTIVE OFFICERS AND DIRECTORS
Gregory L. Reyes(1)...............................            1,535,662                  6.9%        6.0%
Bruce L. Bergman(2)...............................              773,528                  3.5         3.0
Kumar Malavalli(3)................................              606,000                  2.7         2.4
Paul R. Bonderson, Jr.(4).........................              900,000                  4.0         3.5
Victor M. Rinkle(5)...............................              200,000                    *           *
Charles W. Smith(6)...............................              192,000                    *           *
Neal Dempsey(7)...................................              807,843                  3.6         3.1
  c/o Bay Partners Inc.
  10600 N. De Anza Blvd., Suite 100
  Cupertino, CA 95054
Mark Leslie(8)....................................              121,856                    *           *
Seth D. Neiman(9).................................            7,131,107                 31.9        27.8
Larry W. Sonsini(10)..............................              121,856                    *           *
  Wilson Sonsini Goodrich & Rosati, P.C.
  650 Page Mill Road
  Palo Alto, CA 94304
</TABLE>
    
 
                                       58
<PAGE>   60
 
   
<TABLE>
<CAPTION>
                                                                                       PERCENT OF SHARES
                                                                                       BENEFICIALLY OWNED
                                                                                     ----------------------
                                                    NUMBER OF SHARES BENEFICIALLY    BEFORE THE   AFTER THE
       NAME AND ADDRESS OF BENEFICIAL OWNER           OWNED BEFORE THE OFFERING       OFFERING    OFFERING
       ------------------------------------         -----------------------------    ----------   ---------
<S>                                                 <C>                              <C>          <C>
5% STOCKHOLDERS
Crosspoint Venture Partners(11)...................            6,676,107                 29.9        26.0
  2925 Woodside Road
  Woodside, CA 94062
Mohr, Davidow Ventures IV(12).....................            1,579,123                  7.1         6.1
  2774 Sand Hill Road
  Building 1, Suite 240
  Menlo Park, CA 94028
Weiss, Peck & Greer(13)...........................            1,355,017                  6.1         5.3
  555 California Street,
  Suite 3130
  San Francisco, CA 94104
  Attn: Christopher J. Schaepe
Andreas V. Bechtolsheim(14).......................            1,168,814                  5.2         4.6
  1140 Hamilton Avenue
  Palo Alto, CA 94301
ALL EXECUTIVE OFFICERS AND DIRECTORS
  as a group (12 persons)(15).....................           12,919,852                 57.4        50.1
</TABLE>
    
 
- -------------------------
   
 (1) Includes 1,500,110 shares held by Gregory Reyes and Penny Reyes as
     community property, all of which are subject to a right of repurchase in
     favor of Brocade which lapses over time. Also includes 17,776 shares held
     by Gregorio Reyes, Trustee of the Rebecca Mary Reyes 1997 Trust UTA Dated
     August 15, 1997 and 17,776 shares held by Gregorio Reyes, Trustee of the
     Gregory Louis Reyes, Jr. 1996 Trust UTA Dated April 30, 1996.
    
 
   
 (2) All shares listed are held by The Bergman Family Trust. Includes 32,230
     shares subject to a right of repurchase in favor of Brocade which lapses
     over time.
    
 
   
 (3) Includes 60,666 shares subject to a right of repurchase in favor of Brocade
     which lapses over time.
    
 
   
 (4) All shares listed are held by The Bonderson Family Living Trust Dated June
     28, 1994. Includes 75,833 shares subject to a right of repurchase in favor
     of Brocade which lapses over time.
    
 
   
 (5) Includes 137,500 shares subject to a right of repurchase in favor of
     Brocade which lapses over time.
    
 
   
 (6) Includes 131,458 shares subject to a right of repurchase in favor of
     Brocade which lapses over time. Also includes 10,000 shares held by Charles
     Whitney Smith and Helen Clute Smith Irrevocable Trust for the benefit of
     Chelsea Marcelle Smith and Alexander Joseph Smith Dated April 30, 1999, of
     which Mr. Smith is a trustee.
    
 
   
 (7) Mr. Dempsey is a general partner of Bay Partners SBIC, L.P. and is a
     director of Brocade. Includes 796,425 shares held by Bay Partners SBIC,
     L.P. and 11,418 shares subject to warrants held by Bay Partners SBIC, L.P.
     which are exercisable within 60 days of April 30, 1999. Mr. Dempsey
     disclaims beneficial ownership of shares held by this entity, except to the
     extent of his proportional interest arising from his partnership interest
     in Bay Partners SBIC, L.P.
    
 
   
 (8) Includes 8,888 shares held directly by Seth Leslie and 8,888 shares held
     directly by Joshua Leslie, of which Mr. Leslie disclaims beneficial
     ownership.
    
 
                                       59
<PAGE>   61
 
   
 (9) Mr. Neiman is a partner of Crosspoint Venture Partners and the Chairman of
     the board of directors of Brocade. Includes 14,368 shares subject to a
     right of repurchase in favor of Brocade which lapses over time. Includes
     20,000 shares held by The Alexandra Grace Speeth Neiman 1996 Trust and
     20,000 shares held by The Morgan Olivia Speeth Neiman 1996 Trust, of which
     Mr. Neiman disclaims beneficial ownership. Also includes 5,811,556 shares
     held by Crosspoint Venture Partners 1993, 570,821 shares held by Crosspoint
     Venture Partners LS Fund 1997 and 293,730 shares held by Crosspoint 1993
     Entrepreneurs Fund. Mr. Neiman disclaims beneficial ownership of shares
     held by these entities, except for his proportional interest arising from
     his partnership interest in Crosspoint Venture Partners.
    
 
   
(10) Represents 121,856 shares issuable upon exercise of an option held by Mr.
     Sonsini exercisable within 60 days of April 30, 1999.
    
 
   
(11) Represents 5,811,556 shares held by Crosspoint Venture Partners 1993,
     570,821 shares held by Crosspoint Venture Partners LS Fund 1997 and 293,730
     shares held by Crosspoint 1993 Entrepreneurs Fund. Mr. Neiman is a partner
     of Crosspoint Venture Partners and has dispositive and voting power for
     these shares.
    
 
(12) Represents 1,515,959 shares held by Mohr, Davidow Ventures IV and 63,164
     shares held by MDV IV Entrepreneurs' Network Fund, L.P. Jonathan D. Feiber
     is a member of Mohr Davidow Ventures IV and has dispositive and voting
     power for these shares.
 
   
(13) Includes 656,098 shares held by Weiss, Peck & Greer Venture Associates IV,
     L.P., 590,822 shares held by WPG Enterprise Fund III, L.P., 85,259 shares
     held by Weiss, Peck & Greer Venture Associates IV Cayman, L.P. Bank America
     Trust & Banking Corporation (Cayman) Limited and 22,838 shares held by WPG
     Information Sciences Entrepreneur Fund, L.P. Christopher J. Schaepe is a
     Managing Member of Weiss, Peck & Greer and has dispositive and voting power
     for these shares.
    
 
   
(14) Includes 63,164 shares held by TPK Unitrust, of which Mr. Bechtolsheim is
     the trustee.
    
 
   
(15) Includes 2,415,498 shares subject to a right of repurchase in favor of
     Brocade which lapses over time. Also includes 11,418 shares subject to a
     warrant and 121,856 shares subject to options, each of which is exercisable
     within 60 days of April 30, 1999.
    
 
                                       60
<PAGE>   62
 
                          DESCRIPTION OF CAPITAL STOCK
 
     Upon consummation of this offering, our authorized capital stock will
consist of 50,000,000 shares of common stock and 5,000,000 shares of preferred
stock. The following is a summary of the material provisions of the common stock
and the preferred stock contained in Brocade's certificate of incorporation and
bylaws.
 
COMMON STOCK
 
   
     As of April 30, 1999, there were 7,811,677 shares of common stock
outstanding held of record by 165 stockholders. Subject to preferences that may
be applicable to any preferred stock outstanding at the time, the holders of
outstanding shares of common stock are entitled to the following rights:
    
 
      --  to receive dividends out of assets legally available therefor at such
          times and in such amounts as the board of directors from time to time
          may determine;
 
      --  one vote for each share held on all matters submitted to a vote of
          stockholders; and
 
      --  upon liquidation, dissolution or winding-up of Brocade, to share
          ratably in all assets remaining after payment of liabilities and the
          liquidation of any preferred stock.
 
     Cumulative voting for the election of directors is not authorized by our
certificate of incorporation, which means that the holders of a majority of the
shares voted can elect all of the directors then standing for election. The
common stock is not entitled to preemptive rights and is not subject to
conversion or redemption. Each outstanding share of common stock is, and all
shares of common stock to be outstanding upon completion of this offering will
be, upon payment therefor, duly and validly issued, fully paid and
nonassessable.
 
PREFERRED STOCK
 
     The board of directors is authorized, without action by the stockholders,
to designate and issue preferred stock in one or more series. The board of
directors can fix the rights, preferences and privileges of the shares of each
series and any qualifications, limitations or restrictions thereon.
 
     The board of directors may authorize the issuance of preferred stock with
voting or conversion rights that could adversely affect the voting power or
other rights of the holders of common stock. The issuance of preferred stock,
while providing flexibility in connection with possible acquisitions and other
corporate purposes could, among other things, under certain circumstances, have
the effect of delaying, deferring or preventing a change in control of Brocade.
We have no current plans to issue any shares of preferred stock.
 
WARRANTS
 
   
     In December 1995, we issued a warrant to an equipment lease financing
company to purchase 35,444 shares of our Series A Preferred Stock with an
exercise price of $1.00 per share, in consideration for equipment leases and a
loan. In October 1996, we issued a warrant to the same equipment lease financing
company to purchase 15,753 shares of our Series A Preferred Stock with an
exercise price of $4.50 per share, also in consideration for equipment leases
and a loan. In September 1996, we issued a warrant to the same equipment lease
financing company to purchase 17,500 shares of our Series B Preferred Stock at
an exercise price of $4.00 per share. These warrants will remain outstanding
after the completion of this offering and will become exercisable for 239,788
shares of our common stock.
    
 
                                       61
<PAGE>   63
 
   
     In August 1996, we issued a warrant to a real property lessor to purchase
3,000 shares of our Series C Preferred Stock with an exercise price of $3.00 per
share. This warrant will remain outstanding after the completion of this
offering and will become exercisable for 3,000 shares of our common stock.
    
 
   
     In April 1997, we issued a warrant to a sublessor of real property to
purchase 20,000 shares of our Series C Preferred Stock with an exercise price of
$3.00 per share. This warrant will remain outstanding after the completion of
this offering and will become exercisable for 20,000 shares of our common stock.
    
 
   
     In May 1997, we issued a warrant to a bank to purchase 25,000 shares of our
Series C Preferred Stock with an exercise price of $3.00 per share. This warrant
will remain outstanding after the completion of this offering and will become
exercisable for 25,000 shares of our common stock.
    
 
   
     In September 1997, we issued warrants to certain investors in our Series D
Preferred Stock financing to purchase that number of shares equal to 10% of the
number of shares purchased by each respective investor in the financing, for a
total of 296,881 shares, at an exercise price of $6.78 per share. These warrants
terminate upon our initial public offering, and as of April 30, 1999, warrants
for 223,182 shares have been exercised and we have assumed that the remaining
warrants for 73,699 shares will be exercised prior to the closing of our initial
public offering.
    
 
REGISTRATION RIGHTS OF CERTAIN HOLDERS
 
     After this offering, the holders of approximately 14,623,614 shares of
common stock and warrants to acquire 264,788 shares of common stock will be
entitled to rights with respect to the registration of such shares under the
Securities Act. Under the terms of the agreements between us and the holders of
such registrable securities, if we propose to register any of our securities
under the Securities Act, either for our own account or for the account of other
security holders exercising registration rights, such holders are entitled to
notice of such registration and are entitled to include shares of such common
stock therein. Additionally, certain of such holders are also entitled to
certain demand registration rights pursuant to which they may require us on up
to two occasions to file a registration statement under the Securities Act at
our expense with respect to our shares of common stock, and we are required to
use our best efforts to effect such registration. Moreover, holders may require
us to file an unlimited number of additional registration statements on Form S-3
at our expense. All of these registration rights are subject to certain
conditions and limitations, among them the right of the underwriters of an
offering to limit the number of shares included in such registration and our
right not to effect a requested registration within six months following an
offering of our securities, including the offering made here. In addition, the
holders of registration rights have agreed not to exercise such rights for at
least 180 days after the offering without the prior written consent of Morgan
Stanley & Co. Incorporated.
 
DELAWARE LAW AND CERTAIN PROVISIONS OF OUR CERTIFICATE OF INCORPORATION AND
BYLAWS
 
     Certain provisions of Delaware law and our certificate of incorporation and
bylaws could make more difficult the acquisition of Brocade by means of a tender
offer, a proxy contest, or otherwise, and the removal of incumbent officers and
directors. These provisions are expected to discourage certain types of coercive
takeover practices and inadequate takeover bids and to encourage persons seeking
to acquire control of Brocade to first negotiate with us. We believe that the
benefits of increased protection of Brocade's potential ability to negotiate
with the proponent of an unfriendly or unsolicited proposal to acquire or
restructure Brocade outweighs the disadvantages of discouraging such proposals,
including proposals that are priced above the then current market value of our
common stock, because, among other things, negotiation of such proposals could
result in an improvement of their terms.
 
     We are subject to section 203 of the Delaware General Corporation Law. This
provision generally prohibits a Delaware corporation from engaging in any
business combination with any interested
 
                                       62
<PAGE>   64
 
stockholder for a period of three years following the date such stockholder
became an interested stockholder, unless:
 
      --  prior to such date the board of directors of the corporation approved
          either the business combination or the transaction that resulted in
          the stockholder becoming an interested stockholder;
 
      --  upon consummation of the transaction that resulted in the stockholder
          becoming an interested stockholder, the interested stockholder owned
          at least 85% of the voting stock of the corporation outstanding at the
          time the transaction commenced, excluding for purposes of determining
          the number of shares outstanding those shares owned by persons who are
          directors and also officers and by employee stock plans in which
          employee participants do not have the right to determine
          confidentially whether shares held subject to the plan will be
          tendered in a tender or exchange offer; or
 
      --  on or subsequent to such date, the business combination is approved by
          the board of directors and authorized at an annual or special meeting
          of stockholders, and not by written consent, by the affirmative vote
          of at least 66 2/3% of the outstanding voting stock that is not owned
          by the interested stockholder.
 
Section 203 defines business combination to include:
 
      --  any merger or consolidation involving the corporation and the
          interested stockholder;
 
      --  any sale, transfer, pledge or other disposition of 10% or more of the
          assets of the corporation involving the interested stockholder;
 
      --  subject to certain exceptions, any transaction that results in the
          issuance or transfer by the corporation of any stock of the
          corporation to the interested stockholder;
 
      --  any transaction involving the corporation that has the effect of
          increasing the proportionate share of the stock of any class or series
          of the corporation beneficially owned by the interested stockholder;
          or
 
      --  the receipt by the interested stockholder of the benefit of any loans,
          advances, guarantees, pledges or other financial benefits provided by
          or through the corporation. In general, section 203 defines an
          interested stockholder as any entity or person beneficially owning 15%
          or more of the outstanding voting stock of the corporation and any
          entity or person affiliated with or controlling or controlled by such
          entity or person.
 
   
     Our certificate of incorporation and bylaws require that any action
required or permitted to be taken by our stockholders must be effected at a duly
called annual or special meeting of the stockholders and may not be effected by
a consent in writing. In addition, special meetings of our stockholders may be
called only by the board of directors, certain of our officers or stockholders
holding a majority of our outstanding voting securities. Our certificate of
incorporation and bylaws also provide that, beginning upon the closing of the
offering, our board of directors will be divided into three classes, with each
class serving staggered three-year terms and that certain amendments of the
certificate of incorporation and of the bylaws require the approval of holders
of at least 66 2/3% of the voting power of all outstanding stock. These
provisions may have the effect of deferring hostile takeovers or delaying
changes in control or management of Brocade.
    
 
TRANSFER AGENT AND REGISTRAR
 
     The Transfer Agent and Registrar for our common stock is Norwest Bank
Minnesota, N.A. Its address is 161 North Concord Exchange, South St. Paul,
Minnesota 55075-0738, and its telephone number at this location is (651)
450-4189.
 
                                       63
<PAGE>   65
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
     Immediately prior to this offering, there was no public market for our
common stock. Future sales of substantial amounts of common stock in the public
market could adversely affect the market price of the common stock.
 
   
     Upon completion of this offering, we will have outstanding 25,685,291
shares of common stock, assuming the issuance of 3,250,000 shares of common
stock offered hereby and no exercise of options after April 30, 1999. Of these
shares, the 3,250,000 shares sold in the offering will be freely tradable
without restriction or further registration under the Securities Act, provided,
however, that if shares are purchased by "affiliates" as that term is defined in
Rule 144 under the Securities Act, their sales of shares would be subject to
certain limitations and restrictions that are described below.
    
 
   
     The remaining 22,435,291 shares of common stock held by existing
stockholders were issued and sold by us in reliance on exemptions from the
registration requirements of the Securities Act. All of these shares will be
subject to "lock-up" agreements described below on the effective date of the
offering. Upon expiration of the lock-up agreements 180 days after the effective
date of the offering, 10,949,935 shares will become eligible for sale, subject
in most cases to the limitations of Rule 144. In addition, holders of stock
options could exercise such options and sell certain of the shares issued upon
exercise as described below.
    
 
   
<TABLE>
<CAPTION>
DAYS AFTER DATE OF      APPROXIMATE SHARES
 THIS PROSPECTUS     ELIGIBLE FOR FUTURE SALE                         COMMENT
- ------------------   ------------------------   ----------------------------------------------------
<S>                  <C>                        <C>
On Effectiveness             3,250,000          Shares sold in the offering
90 Days                              0          Shares salable under Rule 144
180 Days                    10,949,935          Lock-up released; shares salable under Rules 144 and
                                                  701
</TABLE>
    
 
   
     As of April 30, 1999, there were a total of 902,525 shares of common stock
subject to outstanding options under our 1995 Equity Incentive Plan, 141,737 of
which were vested. As of April 30, 1999, there were a total of 1,524,872 shares
of common stock subject to outstanding options under our 1998 Equity Incentive
Plan, 156,361 of which were vested. As of April 30, 1999, no shares of common
stock were subject to outstanding options under our 1998 Executive Equity
Incentive Plan. However, all of these shares are subject to lock-up agreements.
Immediately after the completion of the offering, Brocade intends to file
registration statements on Form S-8 under the Securities Act to register all of
the shares of common stock issued or reserved for future issuance under our 1999
Stock Plan, 1999 Director Option Plan and 1999 Employee Stock Purchase Plan. On
the date 180 days after the effective date of the offering, a total of 586,621
shares of common stock subject to outstanding options will be vested. After the
effective dates of the registration statements on Form S-8, shares purchased
upon exercise of options granted pursuant to the 1999 Stock Plan, 1999 Director
Option Plan and 1999 Employee Stock Purchase Plan generally would be available
for resale in the public market.
    
 
     Our officers, directors and substantially all other stockholders have
agreed with Morgan Stanley & Co. Incorporated not to sell or otherwise dispose
of any of their shares for a period of 180 days after the date of the offering.
Morgan Stanley & Co. Incorporated, however, may in its sole discretion, at any
time without notice, release all or any portion of the shares subject to these
lock-up agreements. All of our stockholders have also agreed with Brocade not to
sell or otherwise dispose of any of their shares for a period of 180 days after
the effective date of the offering.
 
                                       64
<PAGE>   66
 
RULE 144
 
     In general, under Rule 144 as currently in effect, beginning 90 days after
the date of this prospectus, a person who has beneficially owned shares of our
common stock for at least one year would be entitled to sell, within any
three-month period, a number of shares that does not exceed the greater of:
 
   
      --  1% of the number of shares of common stock then outstanding, which
          will equal approximately 256,853 shares immediately after this
          offering; or
    
 
      --  the average weekly trading volume of the common stock on the Nasdaq
          National Market during the four calendar weeks preceding the filing of
          a notice on Form 144 with respect to such sale.
 
     Sales under Rule 144 are also subject to certain other requirements
regarding the manner of sale, notice filing and the availability of current
public information about us.
 
RULE 144(k)
 
     Under Rule 144(k), a person who is not deemed to have been one of Brocade's
"affiliates" at any time during the 90 days preceding a sale, and who has
beneficially owned the shares proposed to be sold for at least two years,
including the holding period of any prior owner other than an "affiliate," is
entitled to sell such shares without complying with the manner of sale, notice
filing, volume limitation or notice provisions of Rule 144. Therefore, unless
otherwise restricted, "144(k) shares" may be sold immediately upon the
completion of this offering.
 
RULE 701
 
     In general, under Rule 701, any Brocade employee, director, officer,
consultant or advisor who purchases shares from us in connection with a
compensatory stock or option plan or other written agreement before the
effective date of the offering is entitled to resell such shares 90 days after
the effective date of this offering in reliance on Rule 144, without having to
comply with certain restrictions, including the holding period, contained in
Rule 144.
 
     The Securities and Exchange Commission has indicated that Rule 701 will
apply to typical stock options granted by an issuer before it becomes subject to
the reporting requirements of the Securities Exchange Act of 1934, along with
the shares acquired upon exercise of such options, including exercises after the
date of this prospectus. Securities issued in reliance on Rule 701 are
restricted securities and, subject to the contractual restrictions described
above, beginning 90 days after the date of this prospectus, may be sold by
persons other than "affiliates," as defined in Rule 144, subject only to the
manner of sale provisions of Rule 144 and by "affiliates" under Rule 144 without
compliance with its one year minimum holding period requirement.
 
                                       65
<PAGE>   67
 
                                  UNDERWRITERS
 
     Under the terms and subject to the conditions contained in the underwriting
agreement dated the date of this prospectus, the underwriters named below, for
whom Morgan Stanley & Co. Incorporated, BT Alex. Brown Incorporated and Dain
Rauscher Wessels, a division of Dain Rauscher Incorporated, are acting as
representatives, have severally agreed to purchase, and Brocade has agreed to
sell to them, severally, the respective number of shares of common stock set
forth opposite the names of the underwriters below:
 
<TABLE>
<CAPTION>
                                                              NUMBER OF
                            NAME                               SHARES
                            ----                              ---------
<S>                                                           <C>
Morgan Stanley & Co. Incorporated...........................
BT Alex. Brown Incorporated.................................
Dain Rauscher Wessels, a division of Dain Rauscher
  Incorporated..............................................
                                                              ---------
          Total.............................................  3,250,000
                                                              =========
</TABLE>
 
     The underwriters are offering the shares subject to their acceptance of the
shares from Brocade and subject to prior sale. The underwriting agreement
provides that the obligations of the several underwriters to pay for and accept
delivery of the shares of common stock offered hereby are subject to the
approval of certain legal matters by their counsel and to certain other
conditions. The underwriters are obligated to take and pay for all of the shares
of common stock offered by this prospectus, other than those covered by the
over-allotment option described below, if any such shares are taken.
 
     The underwriters initially propose to offer part of the shares of common
stock directly to the public at the public offering price set forth on the cover
page of this prospectus and part to certain dealers at a price that represents a
concession not in excess of $               a share under the public offering
price. Any underwriter may allow, and the dealers may reallow, a concession not
in excess of $               a share to other underwriters or to certain other
dealers. After the initial offering of the shares of common stock, the offering
price and other selling terms may from time to time be varied by the
representatives of the underwriters.
 
     Brocade has granted to the underwriters an option, exercisable for 30 days
from the date of this prospectus, to purchase up to 487,500 additional shares of
common stock at the public offering price set forth on the cover page of this
prospectus, less underwriting discounts and commissions. The underwriters may
exercise this option solely for the purpose of covering over-allotments, if any,
made in connection with the offering of the shares of common stock offered by
the prospectus. To the extent this option is exercised, each underwriter will
become obligated, subject to certain conditions, to purchase approximately the
same percentage of additional shares of common stock as the number set forth
next to each underwriter's name in the preceding table bears to the total number
of shares of common stock set forth next to the names of all underwriters in the
preceding table.
 
   
     At the request of Brocade, the underwriters have reserved up to 9.9% of the
shares of common stock to be issued by Brocade and offered hereby for sale, at
the initial public offering price, to various business associates and related
persons of Brocade. No officer, director or employee of Brocade will receive any
of these shares. The number of shares of common stock available for sale to the
general public will be reduced to the extent these individuals purchase such
reserved shares. Any reserved shares which are not so purchased will be offered
by the underwriters to the general public on the same basis as the other shares
offered by this prospectus.
    
 
                                       66
<PAGE>   68
 
     Each of Brocade and the officers, directors and stockholders of Brocade has
agreed that, without the prior written consent of Morgan Stanley & Co.
Incorporated on behalf of the underwriters, or otherwise during the period
ending 180 days after the date of this prospectus, it will not:
 
      --  offer, pledge, sell, contract to sell, sell any option or contract to
          purchase, purchase any option or contract to sell, grant any option,
          right or warrant to purchase, lend, or otherwise transfer or dispose
          of, directly or indirectly, any shares of common stock or any
          securities convertible into or exercisable or exchangeable for common
          stock; or
 
      --  enter into any swap or other arrangement that transfers to another, in
          whole or in part, any of the economic consequences of ownership of the
          common stock, whether any such transaction described above is to be
          settled by delivery of common stock or such other securities, in cash
          or otherwise.
 
     The foregoing restrictions shall not apply to:
 
      --  the sale of any shares to the underwriters pursuant to the
          underwriting agreement; or
 
      --  transactions relating to shares of common stock or other securities
          acquired in open market transactions after the date of this
          prospectus.
 
     The underwriters have informed Brocade that they do not intend sales to
discretionary accounts to exceed five percent of the total number of shares of
common stock offered by them.
 
     Approval of the common stock has been sought for quotation on the Nasdaq
National Market under the symbol "BRCD."
 
     In order to facilitate the offering of the common stock, the underwriters
may engage in transactions that stabilize, maintain or otherwise affect the
price of the common stock. Specifically, the underwriters may over-allot in
connection with the offering, creating a short position in the common stock for
their own account. In addition, to cover over-allotments or to stabilize the
price of the common stock, the underwriters may bid for, and purchase, shares of
common stock in the open market. Finally, the underwriting syndicate may reclaim
selling concessions allowed to an underwriter or a dealer for distributing the
common stock in the offering if the syndicate repurchases previously distributed
shares of common stock in transactions to cover syndicate short positions, in
stabilization transactions or otherwise. Any of these activities may stabilize
or maintain the market price of the common stock above independent market
levels. The underwriters are not required to engage in these activities and may
end any of these activities at any time.
 
     Brocade and the underwriters have agreed to indemnify each other against
certain liabilities, including liabilities under the Securities Act.
 
PRICING OF THE OFFERING
 
     Prior to this offering, there has been no public market for the shares of
common stock. Consequently, the initial public offering price for the shares of
common stock will be determined by negotiations between us and the
representatives of the underwriters. Among the factors to be considered in
determining the initial public offering price will be our record of operations,
our current financial position and future prospects, the experience of our
management, the economics of the SAN industry in general, the general condition
of the equity securities markets, sales, earnings and certain other financial
and operating information of Brocade in recent periods, the price-earnings
ratios, price-sales ratios, market prices of securities and certain financial
and operating information of companies engaged in activities similar to those of
Brocade. The estimated initial public offering price range set forth on the
 
                                       67
<PAGE>   69
 
cover page of this preliminary prospectus is subject to change as a result of
market conditions and other factors.
 
                                 LEGAL MATTERS
 
     The validity of the shares of common stock offered hereby will be passed
upon for us by Wilson Sonsini Goodrich & Rosati, Professional Corporation. Larry
W. Sonsini, a director of Brocade and a partner of Wilson Sonsini Goodrich &
Rosati, beneficially owns 121,856 shares of our common stock. Certain legal
matters in connection with this offering will be passed upon for the
underwriters by Gray Cary Ware & Freidenrich LLP.
 
                                    EXPERTS
 
     The financial statements and schedule included in this prospectus and
elsewhere in the registration statement have been audited by Arthur Andersen
LLP, independent public accountants, as indicated in their reports with respect
thereto, and are included herein in reliance upon the authority of said firm as
experts in giving said reports.
 
             CHANGE IN INDEPENDENT ACCOUNTANTS AND FISCAL YEAR END
 
     Effective October 1997, Arthur Andersen LLP was engaged as our independent
accountants and replaced PricewaterhouseCoopers LLP who was dismissed as our
independent accountants. Also at that time, we changed our fiscal year from
December 31 to October 31. The decision to change independent accountants was
approved by our board of directors. Prior to October 1997,
PricewaterhouseCoopers LLP issued a report on the periods from inception through
December 31, 1996. This report contained no adverse opinion or disclaimer of
opinion and was not qualified or modified as to uncertainty, audit scope or
accounting principle. In connection with the audit for the periods ended
December 31, 1996, there were no disagreements with PricewaterhouseCoopers LLP
on any matter of accounting principles or practices, financial statement
disclosure, or auditing scope or procedure, which disagreements if not resolved
to the satisfaction of PricewaterhouseCoopers LLP would have caused them to make
reference thereto in their report on the financial statements for such periods.
PricewaterhouseCoopers LLP has not audited or reported on any of the financial
statements or information included in this prospectus. Prior to October 1997, we
had not consulted with Arthur Andersen LLP on items that involved our accounting
principles or the form of audit opinion to be issued on our financial
statements.
 
                                       68
<PAGE>   70
 
                   WHERE YOU MAY FIND ADDITIONAL INFORMATION
 
     We filed with the Securities and Exchange Commission a registration
statement on Form S-1 under the Securities Act for the shares of common stock in
this offering. This prospectus does not contain all of the information in the
registration statement and the exhibits and schedule that were filed with the
registration statement. For further information with respect to Brocade and our
common stock, we refer you to the registration statement and the exhibits and
schedule that were filed with the registration statement. Statements contained
in this prospectus about the contents of any contract or any other document that
is filed as an exhibit to the registration statement are materially complete. A
copy of the registration statement and the exhibits and schedule that were filed
with the registration statement may be inspected without charge at the public
reference facilities maintained by the Securities and Exchange Commission in
Room 1024, 450 Fifth Street, N.W., Washington, D.C. 20549, and copies of all or
any part of the registration statement may be obtained from the Securities and
Exchange Commission upon payment of the prescribed fee. The Securities and
Exchange Commission maintains a World Wide Web site that contains reports, proxy
and information statements and other information regarding registrants that file
electronically with the Securities and Exchange Commission. The address of the
site is http://www.sec.gov.
 
     Upon completion of this offering, Brocade will become subject to the
information and periodic reporting requirements of the Securities Exchange Act
of 1934, and, in accordance with the requirements of the Securities Exchange Act
of 1934, will file periodic reports, proxy statements and other information with
the Securities and Exchange Commission. These periodic reports, proxy statements
and other information will be available for inspection and copying at the
regional offices, public reference facilities and web site of the Securities and
Exchange Commission referred to above.
 
     Our principal offices are located at 1901 Guadalupe Parkway, San Jose,
California 95131 and our telephone number is (408) 487-8000. We maintain a
worldwide web site at http://www.brocade.com. The reference to our web address
does not constitute incorporation by reference of the information contained in
that site.
 
     Brocade, SilkWorm, SilkWorm Express and Brocade's logo are trademarks of
Brocade, some of which may be registered or are pending registration in certain
jurisdictions. All other brand names, logos and trademarks appearing in this
prospectus are the property of their respective holders.
 
                                       69
<PAGE>   71
 
                      (THIS PAGE INTENTIONALLY LEFT BLANK)
<PAGE>   72
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                              PAGE
                                                              ----
<S>                                                           <C>
Report of Independent Public Accountants....................  F-2
Balance Sheets..............................................  F-3
Statements of Operations....................................  F-4
Statements of Redeemable Convertible Preferred Stock and
  Shareholders' Equity (Deficit)............................  F-5
Statements of Cash Flows....................................  F-6
Notes to Financial Statements...............................  F-7
</TABLE>
 
                                       F-1
<PAGE>   73
 
     After the reincorporation discussed in Note 10 to Brocade Communications
Systems, Inc. financial statements, we expect to be in a position to render the
following audit report:
 
                                      ARTHUR ANDERSEN LLP
San Jose, California
November 24, 1998
 
                    REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS
 
To the Board of Directors and Shareholders
of Brocade Communications Systems, Inc.:
 
     We have audited the accompanying balance sheets of Brocade Communications
Systems, Inc. (a California corporation) as of October 31, 1998 and 1997 and the
related statements of operations, redeemable convertible preferred stock and
shareholders' equity (deficit) and cash flows for each of the three years in the
period ended October 31, 1998. These financial statements are the responsibility
of the Company's management. Our responsibility is to express an opinion on
these financial statements based on our audits.
 
     We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also includes
assessing the accounting principles used and significant estimates made by
management, as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
   
     In our opinion, the financial statements referred to above present fairly,
in all material respects, the financial position of Brocade Communications
Systems, Inc. as of October 31, 1998 and 1997 and the results of its operations
and its cash flows for each of the three years in the period ended October 31,
1998 in conformity with generally accepted accounting principles.
    
 
San Jose, California
November 24, 1998
(except with respect to the matters
discussed in Note 10, as to which the
   
date is May   , 1999)
    
 
                                       F-2
<PAGE>   74
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                                 BALANCE SHEETS
                       (IN THOUSANDS, EXCEPT SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                                                     APRIL 30,
                                                                                                       1999
                                                                  OCTOBER 31,                        PRO FORMA
                                                              -------------------    APRIL 30,     SHAREHOLDERS'
                                                                1997       1998        1999       EQUITY (NOTE 6)
                                                              --------   --------   -----------   ---------------
                                                                                             (UNAUDITED)
<S>                                                           <C>        <C>        <C>           <C>
ASSETS
Current assets:
  Cash and cash equivalents.................................  $  2,552   $ 10,420    $  8,668
  Short-term investments....................................    15,920         --          --
  Accounts receivable, net of allowance for doubtful
    accounts of $100, $285 and $289, respectively...........     2,646      3,430       8,454
  Inventories...............................................       471      1,744       2,758
  Prepaid expenses and other current assets.................       342        220       1,986
                                                              --------   --------    --------
Total current assets........................................    21,931     15,814      21,866
Property and equipment, net.................................     3,922      5,323       5,452
Other assets................................................       247        164         132
                                                              --------   --------    --------
                                                              $ 26,100   $ 21,301    $ 27,450
                                                              ========   ========    ========
LIABILITIES AND SHAREHOLDERS' EQUITY (DEFICIT)
Current liabilities:
  Borrowings under line of credit...........................  $    500   $  1,672    $  1,200
  Current portion of debt...................................       367      1,231       1,314
  Current portion of capital lease obligations..............       679        784         625
  Accounts payable..........................................     3,292      3,247       6,236
  Accrued liabilities.......................................     1,225      3,061       3,529
  Deferred revenue..........................................       534        543       3,901
                                                              --------   --------    --------
         Total current liabilities..........................     6,597     10,538      16,805
                                                              --------   --------    --------
Long-term liabilities:
  Long-term portion of debt.................................       694      1,731       1,293
  Long-term portion of capital lease obligations............     1,260        478         232
  Commitments and contingencies (Note 4)
  Redeemable convertible preferred stock, no par value,
    aggregate liquidation preference of $37,362:
    Authorized -- 9,791,280 shares at April 30, 1999 and pro
      forma
    Issued and outstanding (Series A, B, C and
      D) -- 8,370,431 shares at October 31, 1997; 9,235,483
      shares at October 31, 1998; 9,458,665 shares at April
      30, 1999; and no shares issued and outstanding pro
      forma.................................................    30,359     35,261      37,016
  Warrants to purchase redeemable convertible preferred
    stock...................................................       648        648         405
                                                              --------   --------    --------
         Total long-term liabilities........................    32,961     38,118      38,946
                                                              --------   --------    --------
Shareholders' equity (deficit):
  Common stock, no par value:
    Authorized -- 30,000,000 shares at April 30, 1999 and
      pro forma
    Issued and outstanding -- 4,913,383 shares at October
      31, 1997; 5,194,765 shares at October 31, 1998;
      7,811,677 shares at April 30, 1999; and 22,435,291
      shares outstanding pro forma..........................       424      2,225      13,765        $ 51,281
Deferred stock compensation.................................       (88)      (300)     (4,000)         (4,000)
Notes receivable from shareholders..........................       (75)      (450)     (6,549)         (6,549)
Accumulated deficit.........................................   (13,719)   (28,830)    (31,517)        (31,517)
                                                              --------   --------    --------        --------
         Total shareholders' equity (deficit)...............   (13,458)   (27,355)    (28,301)       $  9,215
                                                              --------   --------    --------        --------
                                                              $ 26,100   $ 21,301    $ 27,450
                                                              ========   ========    ========
</TABLE>
    
 
See accompanying notes.
 
                                       F-3
<PAGE>   75
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                            STATEMENTS OF OPERATIONS
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
   
<TABLE>
<CAPTION>
                                                                             SIX MONTHS ENDED
                                                 YEAR ENDED OCTOBER 31,          APRIL 30,
                                              ----------------------------   -----------------
                                               1996      1997       1998      1998      1999
                                              -------   -------   --------   -------   -------
                                                                                (UNAUDITED)
<S>                                           <C>       <C>       <C>        <C>       <C>
Revenues:
Product revenue.............................  $    --   $ 8,482   $ 22,414   $12,958   $16,969
License revenue.............................       --        --      1,832     1,312     1,578
                                              -------   -------   --------   -------   -------
     Total revenues.........................       --     8,482     24,246    14,270    18,547
Cost of revenues............................       --     6,682     15,759     8,369     8,758
                                              -------   -------   --------   -------   -------
     Gross profit...........................       --     1,800      8,487     5,901     9,789
                                              -------   -------   --------   -------   -------
Operating expenses:
General and administrative..................      575     1,464      3,813     1,263     1,415
Sales and marketing.........................      152     2,112      5,154     2,376     4,086
Research and development....................    3,091     7,666     14,744     6,295     5,634
Amortization of deferred compensation.......       --        --          7        --     1,377
                                              -------   -------   --------   -------   -------
     Total operating expenses...............    3,818    11,242     23,718     9,934    12,512
                                              -------   -------   --------   -------   -------
Loss from operations........................   (3,818)   (9,442)   (15,231)   (4,033)   (2,723)
Other income (expense)......................     (116)     (177)       120       163        36
                                              -------   -------   --------   -------   -------
Net loss....................................  $(3,934)  $(9,619)  $(15,111)  $(3,870)  $(2,687)
                                              =======   =======   ========   =======   =======
Basic net loss per share....................  $ (9.50)  $ (4.82)  $  (4.44)  $ (1.35)  $  (.56)
                                              =======   =======   ========   =======   =======
Shares used in computing basic net loss per
  share.....................................      414     1,997      3,400     2,857     4,757
                                              =======   =======   ========   =======   =======
 
Pro forma basic net loss per share
  (unaudited)...............................                      $   (.84)            $  (.14)
                                                                  ========             =======
Shares used in computing pro forma basic net
  loss per share (unaudited)................                        17,915              19,193
                                                                  ========             =======
</TABLE>
    
 
See accompanying notes.
 
                                       F-4
<PAGE>   76
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
            STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND
                         SHAREHOLDERS' EQUITY (DEFICIT)
                                 (IN THOUSANDS)
   
<TABLE>
<CAPTION>
                                           REDEEMABLE CONVERTIBLE                                           NOTES
                                               PREFERRED STOCK           COMMON STOCK       DEFERRED      RECEIVABLE
                                         ---------------------------   ----------------      STOCK           FROM       ACCUMULATED
                                         SHARES   AMOUNT    WARRANTS   SHARES   AMOUNT    COMPENSATION   SHAREHOLDERS     DEFICIT
                                         ------   -------   --------   ------   -------   ------------   ------------   -----------
<S>                                      <C>      <C>       <C>        <C>      <C>       <C>            <C>            <C>
Balances at October 31, 1995...........  1,425    $ 1,411    $  --     2,093    $    52     $    --        $   (52)      $   (166)
Issuance of warrants related to
  leases...............................     --         --      188        --         --          --             --             --
Exercise of options....................     --         --       --     1,562         48          --             --             --
Issuance of Series B Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $63................    816      3,202       --        --         --          --             --             --
Forgiveness of notes receivable from
  founders.............................     --         --       --        --         --          --             52             --
Stock in exchange for services.........     --         --       --        66         13          --             --             --
Issuance of common stock to officer....     --         --       --       773        151        (132)            --             --
Deferred compensation..................     --         --       --        --         --          11             --             --
Net loss...............................     --         --       --        --         --          --             --         (3,934)
                                         -----    -------    -----     -----    -------     -------        -------       --------
Balances at October 31, 1996...........  2,241      4,613      188     4,494        264        (121)            --         (4,100)
Exercise of options....................     --         --       --       384         90          --             --             --
Issuance of stock for notes receivable
  from shareholders....................     --         --       --       250         75          --            (75)            --
Repurchase of common stock.............     --         --       --      (215)        (5)         --             --             --
Issuance of Series C Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $49................  3,333      9,952       --        --         --          --             --             --
Issuance of Series D Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $42................  2,796     15,794       --        --         --          --             --             --
Issuance of warrants related to leases
  and notes payable....................     --         --      135        --         --          --             --             --
Issuance of warrants...................     --         --      325        --         --          --             --             --
Deferred compensation..................     --         --       --        --         --          33             --             --
Net loss...............................     --         --       --        --         --          --             --         (9,619)
                                         -----    -------    -----     -----    -------     -------        -------       --------
Balances at October 31, 1997...........  8,370     30,359      648     4,913        424         (88)           (75)       (13,719)
Exercise of options....................     --         --       --       201         55          --             --             --
Compensation charges...................     --         --       --        --      1,067          88             --             --
Deferred compensation..................     --         --       --        --        307        (307)            --             --
Amortization of deferred
  compensation.........................     --         --       --        --         --           7             --             --
Issuance of Series D Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $98................    865      4,902       --        --         --          --             --             --
Issuance of stock for notes receivable
  from shareholders....................     --         --       --       225        375          --           (375)            --
Stock in exchange for services.........     --         --       --        18         41          --             --             --
Repurchase of common stock.............     --         --       --      (162)       (44)         --             --             --
Net loss...............................     --         --       --        --         --          --             --        (15,111)
                                         -----    -------    -----     -----    -------     -------        -------       --------
Balances at October 31, 1998...........  9,235     35,261      648     5,195      2,225        (300)          (450)       (28,830)
Exercise of options (unaudited)........                                  338        285
Issuance of Series D Redeemable
  Convertible Preferred Stock
  (unaudited)..........................    223      1,755     (243)       --         --          --             --             --
Issuance of stock for notes receivable
  from shareholders (unaudited)........     --         --       --     2,307      6,099          --         (6,099)            --
Compensation charges (unaudited).......     --         --       --        --         80          --             --             --
Deferred compensation (unaudited)......     --         --       --        --      5,077      (5,077)            --             --
Amortization of deferred compensation
  (unaudited)..........................     --         --       --        --         --       1,377             --             --
Repurchase of common stock
  (unaudited)..........................     --         --       --       (28)        (1)         --             --             --
Net loss (unaudited)...................     --         --       --        --         --          --             --         (2,687)
                                         -----    -------    -----     -----    -------     -------        -------       --------
Balances at April 30, 1999
  (unaudited)..........................  9,458    $37,016    $ 405     7,812    $13,765     $(4,000)       $(6,549)      $(31,517)
                                         =====    =======    =====     =====    =======     =======        =======       ========
 
<CAPTION>
                                            TOTAL
                                         SHAREHOLDERS
                                            EQUITY
                                          (DEFICIT)
                                         ------------
<S>                                      <C>
Balances at October 31, 1995...........    $   (166)
Issuance of warrants related to
  leases...............................          --
Exercise of options....................          48
Issuance of Series B Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $63................          --
Forgiveness of notes receivable from
  founders.............................          52
Stock in exchange for services.........          13
Issuance of common stock to officer....          19
Deferred compensation..................          11
Net loss...............................      (3,934)
                                           --------
Balances at October 31, 1996...........      (3,957)
Exercise of options....................          90
Issuance of stock for notes receivable
  from shareholders....................          --
Repurchase of common stock.............          (5)
Issuance of Series C Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $49................          --
Issuance of Series D Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $42................          --
Issuance of warrants related to leases
  and notes payable....................          --
Issuance of warrants...................          --
Deferred compensation..................          33
Net loss...............................      (9,619)
                                           --------
Balances at October 31, 1997...........     (13,458)
Exercise of options....................          55
Compensation charges...................       1,155
Deferred compensation..................          --
Amortization of deferred
  compensation.........................           7
Issuance of Series D Redeemable
  Convertible Preferred Stock, net of
  issuance costs of $98................          --
Issuance of stock for notes receivable
  from shareholders....................          --
Stock in exchange for services.........          41
Repurchase of common stock.............         (44)
Net loss...............................     (15,111)
                                           --------
Balances at October 31, 1998...........     (27,355)
Exercise of options (unaudited)........         285
Issuance of Series D Redeemable
  Convertible Preferred Stock
  (unaudited)..........................          --
Issuance of stock for notes receivable
  from shareholders (unaudited)........          --
Compensation charges (unaudited).......          80
Deferred compensation (unaudited)......          --
Amortization of deferred compensation
  (unaudited)..........................       1,377
Repurchase of common stock
  (unaudited)..........................          (1)
Net loss (unaudited)...................      (2,687)
                                           --------
Balances at April 30, 1999
  (unaudited)..........................    $(28,301)
                                           ========
</TABLE>
    
 
See accompanying notes.
 
                                       F-5
<PAGE>   77
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                            STATEMENTS OF CASH FLOWS
                                 (IN THOUSANDS)
 
   
<TABLE>
<CAPTION>
                                                                                                 SIX MONTHS
                                                                                                    ENDED
                                                                 YEAR ENDED OCTOBER 31,           APRIL 30,
                                                              -----------------------------   -----------------
                                                               1996       1997       1998      1998      1999
                                                              -------   --------   --------   -------   -------
                                                                                                 (UNAUDITED)
<S>                                                           <C>       <C>        <C>        <C>       <C>
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss....................................................  $(3,934)  $ (9,619)  $(15,111)  $(3,870)  $(2,687)
Adjustments to reconcile net loss to net cash used in
  operating activities:
  Depreciation and amortization.............................      246      1,020      2,374     1,101       919
  Loss on disposition of equipment..........................       --         73         --        --        --
  Noncash compensation expense..............................       11         33      1,202       150     1,457
  Forgiveness of founders' notes receivable.................       52         --         --        --        --
  Changes in assets and liabilities
    Accounts receivable.....................................       --     (2,646)      (784)    1,287    (5,024)
    Inventories.............................................       --       (471)    (1,273)   (4,711)   (1,014)
    Prepaid expenses and other assets.......................      (40)      (140)       205         2    (1,734)
    Accounts payable........................................       12      3,023        (45)      598     2,989
    Accrued liabilities.....................................       10      1,167      1,836     1,014       468
    Deferred revenue........................................      250        285          9      (223)    3,358
                                                              -------   --------   --------   -------   -------
      Net cash used in operating activities.................   (3,393)    (7,275)   (11,587)   (4,652)   (1,268)
                                                              -------   --------   --------   -------   -------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Purchases of property and equipment.......................   (1,518)    (3,423)    (3,775)   (3,206)   (1,048)
  Proceeds from disposition (purchases) of short-term
    investments.............................................       --    (15,920)    15,920    15,920        --
                                                              -------   --------   --------   -------   -------
      Net cash provided by (used in) investing activities...   (1,518)   (19,343)    12,145    12,714    (1,048)
                                                              -------   --------   --------   -------   -------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Line of credit borrowings.................................       --        500      1,672        --        --
  Line of credit repayments.................................       --         --       (500)       --      (472)
  Payments on capital lease obligations.....................     (155)      (504)      (677)     (332)     (405)
  Proceeds from capital lease financing.....................    1,340      1,258         --        --        --
  Proceeds from notes payable...............................       --      1,091      2,594     1,087       247
  Repayments of notes payable...............................       --        (30)      (693)       --      (602)
  Proceeds from issuance of redeemable convertible preferred
    stock and warrants......................................    3,202     26,070      4,902     4,902     1,512
  Proceeds from issuance of common stock....................       56         90         56        12       285
  Repurchase of common stock................................       --         (5)       (44)       --        (1)
                                                              -------   --------   --------   -------   -------
      Net cash provided by financing activities.............    4,443     28,470      7,310     5,669       564
                                                              -------   --------   --------   -------   -------
Net increase (decrease) in cash and cash equivalents........     (468)     1,852      7,868    13,731    (1,752)
Cash and cash equivalents, beginning of period..............    1,168        700      2,552     2,552    10,420
                                                              -------   --------   --------   -------   -------
Cash and cash equivalents, end of period....................  $   700   $  2,552   $ 10,420   $16,283   $ 8,668
                                                              =======   ========   ========   =======   =======
Supplemental disclosure of cash flow information
  Cash paid for interest....................................  $   109   $    351   $    557   $   261   $   245
                                                              =======   ========   ========   =======   =======
</TABLE>
    
 
See accompanying notes.
 
                                       F-6
<PAGE>   78
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                         NOTES TO FINANCIAL STATEMENTS
 
1.  ORGANIZATION AND OPERATIONS OF BROCADE
 
     Brocade Communications Systems, Inc. (Brocade) was incorporated on August
24, 1995 and provides network switches for deployment in storage area networks
("SANs"). Brocade's primary product line, SilkWorm, operates at gigabit speeds
and is based on the Fibre Channel protocol. A SAN provides a networking
environment for connecting a data center's servers and storage systems.
 
   
     Brocade sells its products and services primarily to original equipment
manufacturers located in the United States. Brocade is subject to a number of
business risks including, but not limited to, ability to obtain adequate
financing to support growth, dependence on key individuals, dependence on key
suppliers of integral component parts, competition from substitute products and
larger companies and the need for the continued successful development,
manufacturing, marketing and selling of its SAN switching products.
    
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
Unaudited Interim Financial Data
 
   
     The unaudited interim financial statements for the six months ended April
30, 1998 and 1999 have been prepared on the same basis as the audited financial
statements and, in the opinion of management, reflect all normal recurring
adjustments necessary to present fairly the financial information set forth
therein, in accordance with generally accepted accounting principles.
    
 
Use of Estimates in Preparation of Financial Statements
 
     The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the date of the financial
statements, and reported amounts of revenues and expenses during the reporting
period. Actual results could differ from those estimates.
 
Cash, Cash Equivalents and Short-term Investments
 
     For purposes of the statements of cash flows, cash and cash equivalents
consist of investments with original maturities of less than three months,
primarily commercial paper.
 
     During 1997, Brocade classified its short-term investments as
held-to-maturity and carried them at amortized cost. At October 31, 1997, the
fair value of Brocade's investments approximated amortized cost and, as such,
unrealized holding gains and losses were insignificant. The fair value of
Brocade's investments was determined based on quoted market prices at the
reporting date for those instruments.
 
Concentrations of Credit Risk
 
     Financial instruments that potentially subject Brocade to a concentration
of credit risk principally consist of accounts receivable. Brocade generally
does not require collateral on accounts receivable, as the majority of Brocade's
customers are large, well established companies. Brocade provides reserves for
 
                                       F-7
<PAGE>   79
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
credit losses and product sales returns. At October 31, 1997 and 1998 and April
30, 1999, approximately 99%, 76% and 58%, respectively, of accounts receivable
was concentrated with four customers.
    
 
   
Inventories
    
 
     Inventories are stated at the lower of cost or market, using the first in,
first out method. Inventory costs include material, labor and overhead.
Inventories consisted of the following, (in thousands):
 
   
<TABLE>
<CAPTION>
                                                               OCTOBER 31,
                                                            ------------------     APRIL 30,
                                                             1997       1998         1999
                                                            -------    -------    -----------
                                                                                  (UNAUDITED)
    <S>                                                     <C>        <C>        <C>
    Raw materials.........................................   $158      $1,203       $1,074
    Work-in-process.......................................     75           6           86
    Finished goods........................................    238         535        1,598
                                                             ----      ------       ------
                                                             $471      $1,744       $2,758
                                                             ====      ======       ======
</TABLE>
    
 
Property and Equipment
 
   
     Property and equipment are stated at cost. Depreciation for all property
and equipment is computed using the straight-line method over the estimated
useful lives of the assets, generally three to four years. Leasehold
improvements are amortized over the shorter of their useful lives or the term of
the lease. Property and equipment consisted of the following, (in thousands):
    
 
   
<TABLE>
<CAPTION>
                                                             OCTOBER 31,
                                                          ------------------     APRIL 30,
                                                           1997       1998         1999
                                                          -------    -------    -----------
                                                                                (UNAUDITED)
    <S>                                                   <C>        <C>        <C>
    Computers and equipment.............................  $ 4,617    $ 8,186      $ 9,147
    Leasehold improvements..............................      196        345          363
    Furniture and fixtures..............................      377        434          503
    Less: Accumulated depreciation and amortization.....   (1,268)    (3,642)      (4,561)
                                                          -------    -------      -------
                                                          $ 3,922    $ 5,323      $ 5,452
                                                          =======    =======      =======
</TABLE>
    
 
   
     Included in property and equipment are assets acquired under capital lease
obligations with a cost and related accumulated amortization of approximately
$2.6 million and $1.8 million, respectively, at October 31, 1998.
    
 
Software Development Costs
 
   
     In accordance with Statement of Financial Accounting Standards (SFAS) No.
86, "Accounting for the Costs of Computer Software to be Sold, Leased, or
Otherwise Marketed," Brocade capitalizes eligible computer software development
costs upon the establishment of technological feasibility, which it has defined
as completion of designing, coding and testing activities. For the years ended
October 31, 1997 and October 31, 1998, and the six months ended April 30, 1998
and 1999, the amount of costs eligible for capitalization, after consideration
of factors such as realizable value, were not material and,
    
 
                                       F-8
<PAGE>   80
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
accordingly, all software development costs have been charged to research and
development expense in the accompanying statements of operations.
 
Accrued Liabilities
 
     Accrued liabilities consisted of the following, (in thousands):
 
   
<TABLE>
<CAPTION>
                                                      OCTOBER 31,
                                                    ----------------     APRIL 30,
                                                     1997      1998        1999
                                                    ------    ------    -----------
                                                                        (UNAUDITED)
<S>                                                 <C>       <C>       <C>
Accrued warranty..................................  $  751    $1,350      $1,323
Payroll, bonus, vacation..........................     474       628       1,388
Accrued restructuring (see Note 5)................      --       421          77
Other.............................................      --       662         741
                                                    ------    ------      ------
                                                    $1,225    $3,061      $3,529
                                                    ======    ======      ======
</TABLE>
    
 
Stock-Based Compensation
 
     The Financial Accounting Standards Board issued SFAS No. 123, "Accounting
for Stock-Based Compensation" ("SFAS No. 123"), in October 1995. This accounting
standard permits the use of either a fair value based method or the method
defined in Accounting Principles Board Opinion 25, "Accounting for Stock Issued
to Employees" ("APB 25") to account for stock-based compensation arrangements.
Companies that elect to employ the valuation method provided in APB 25 are
required to disclose the pro forma net income (loss) that would have resulted
from the use of the fair value based method. Brocade has elected to continue to
determine the value of stock-based compensation arrangements under the
provisions of APB 25, and accordingly, it has included the pro forma disclosures
required under SFAS No. 123 in Note 7.
 
Revenue Recognition
 
   
     Product revenue is generally recognized when products are shipped. Revenue
recognition is deferred for shipments to new customers where product returns
cannot be reasonably estimated or significant support services are required to
successfully launch the customer's product. These revenues are recognized when
the customer has successfully integrated and launched its products and Brocade
has met its support obligation. Allowances for warranty costs, credit losses and
estimated future returns are provided for upon shipment. License revenue is
related only to technology associated with certain application-specific
integrated circuits ("ASICs") and is recognized when designs and specifications
are delivered and collection is reasonably assured. Deferred revenues as of
April 30, 1999 were approximately $3.9 million.
    
 
                                       F-9
<PAGE>   81
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
   
     During fiscal 1997 and 1998, and the six months ended April 30, 1999,
approximately 100%, 92%, and 92%, respectively, of Brocade's total revenues were
derived from sales of its SilkWorm product. The percentage of sales to
significant customers was as follows:
    
 
   
<TABLE>
<CAPTION>
                                                               YEAR ENDED
                                                              OCTOBER 31,       SIX MONTHS
                                                              ------------        ENDED
                                                              1997    1998    APRIL 30, 1999
                                                              ----    ----    --------------
                                                                               (UNAUDITED)
<S>                                                           <C>     <C>     <C>
Customer A..................................................   67%     72%          31%
Customer B..................................................   27%     11%          25%
Customer C..................................................   --       1%          15%
</TABLE>
    
 
Computation of Basic Net Loss Per Share and Pro Forma Basic Net Loss Per Share
 
     Basic net loss per common share and diluted net loss per common share are
presented in conformity with Statement of Financial Accounting Standards
("SFAS") No. 128, "Earnings Per Share," ("SFAS No. 128") for all periods
presented. Pursuant to Securities and Exchange Commission Staff Accounting
Bulletin No. 98, common stock and convertible preferred stock issued or granted
for nominal consideration prior to the anticipated effective date of the initial
public offering must be included in the calculation of basic and diluted net
loss per common share as if such stock had been outstanding for all periods
presented. To date, Brocade has not had any issuances or grants for nominal
consideration.
 
     In accordance with SFAS No. 128, basic net loss per common share has been
computed using the weighted-average number of shares of common stock outstanding
during the period, less shares subject to repurchase. Basic pro forma net loss
per common share, as presented in the statements of operations, has been
computed as described above and also gives effect, under Securities and Exchange
Commission guidance, to the conversion of the convertible preferred stock (using
the if-converted method) from the original date of issuance.
 
                                      F-10
<PAGE>   82
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
 
   
<TABLE>
<CAPTION>
                                                                                      SIX MONTHS ENDED
                                                      YEAR ENDED OCTOBER 31,        ---------------------
                                                 --------------------------------   APRIL 30,   APRIL 30,
                                                  1996        1997         1998       1998        1999
                                                 -------   -----------   --------   ---------   ---------
     (IN THOUSANDS, EXCEPT PER SHARE DATA)                                               (UNAUDITED)
<S>                                              <C>       <C>           <C>        <C>         <C>
Net loss.......................................  $(3,934)    $(9,619)    $(15,111)   $(3,870)    $(2,687)
                                                 -------     -------     --------    -------     -------
Basic and diluted:
Weighted average shares of common stock
  outstanding..................................    3,169       4,594        5,174      5,095       6,826
Less: Weighted average shares subject to
  repurchase...................................   (2,755)     (2,597)      (1,774)    (2,239)     (2,069)
                                                 -------     -------     --------    -------     -------
Weighted average shares used in computing basic
  and diluted net loss per common share........      414       1,997        3,400      2,857       4,757
                                                 =======     =======     ========    =======     =======
Basic and diluted net loss per common share....  $ (9.50)    $ (4.82)    $  (4.44)   $ (1.35)    $  (.56)
                                                 =======     =======     ========    =======     =======
Pro forma:
  Net loss.....................................                          $(15,111)               $(2,687)
                                                                         ========                =======
  Shares used above............................                             3,400                  4,757
  Pro forma adjustment to reflect weighted
     effect of assumed conversion of
     convertible preferred stock (unaudited)...                            14,218                 14,362
                                                                         --------                -------
  Pro forma adjustment to reflect assumed
     exercise and conversion of preferred stock
     warrants to purchase 296,881 common shares
     in 1998 and 73,699 common shares in 1999
     at an exercise price of $6.78 per share
     (unaudited)...............................                               297                     74
                                                                         --------                -------
  Shares used in computing pro forma basic and
     diluted net loss per common share
     (unaudited)...............................                            17,915                 19,193
                                                                         ========                =======
  Pro forma basic and diluted net loss per
     common share (unaudited)..................                          $   (.84)               $  (.14)
                                                                         ========                =======
</TABLE>
    
 
   
     Brocade has excluded all convertible preferred stock, warrants for
convertible preferred stock, outstanding stock options and shares subject to
repurchase from the calculation of diluted net loss per common share because all
such securities are antidilutive for all periods presented. The total number of
shares excluded from the calculations of diluted net loss per common share were
10,895,629, 17,561,773, 19,506,313, and 20,035,513 for the years ended October
31, 1996, 1997 and 1998 and the six months ended April 30, 1999, respectively.
See Notes 6 and 7 for further information on these securities.
    
 
Recent Accounting Pronouncements
 
   
     In June 1997, the Financial Accounting Standards Board issued SFAS No. 130,
"Reporting Comprehensive Income," ("SFAS No. 130"). SFAS No. 130 was adopted by
Brocade beginning on November 1, 1997. This standard defines comprehensive
income as the changes in equity of an enterprise except those resulting from
stockholder transactions. Comprehensive loss for each of the three years ended
October 31, 1998 and the six months ended April 30, 1998 and 1999 approximated
net loss.
    
 
                                      F-11
<PAGE>   83
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
2.  SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (CONTINUED)
     In June 1997, the Financial Accounting Standards Board also issued SFAS No.
131 "Disclosures About Segments of an Enterprise and Related Information."
("SFAS No. 131"). SFAS No. 131 was adopted by Brocade beginning on November 1,
1997. SFAS No. 131 establishes standards for disclosures about operating
segments, products and services, geographic areas and major customers. Brocade
is organized and operates as one operating segment, the design, development
manufacturing, marketing and selling of SAN security products. Service revenues
to date have not been significant. Brocade operates in one geographic area, the
United States. Major customers are discussed above.
 
     In March 1998, the AICPA issued SOP No. 98-1, "Accounting for the Costs of
Computer Software Developed or Obtained for Internal Use," ("SOP No. 98-1"). SOP
No. 98-1 requires entities to capitalize certain costs related to internal-use
software once certain criteria have been met. Brocade adopted SOP 98-1 beginning
on November 1, 1998. The adoption did not have a material impact on Brocade's
financial position or results of operations.
 
   
     In December 1998, the AICPA issued SOP 98-9, "Modification of SOP 97-2,
Software Revenue Recognition, With Respect to Certain Transactions," ("SOP
98-9"). SOP 98-9 amends SOP 97-2 and SOP 98-4 by extending the deferral of the
application of certain provisions of SOP 97-2 amended by SOP 98-4 through fiscal
years beginning on or before March 15, 1999. All other provisions of SOP 98-9
are effective for transactions entered into in fiscal years beginning after
March 15, 1999. Brocade has not had significant software sales to date and
management does not expect the adoption of SOP 98-9 to have a significant effect
on the financial condition or results of operations.
    
 
3.  LINE OF CREDIT AND DEBT
 
   
     In June 1997, Brocade entered into a revolving line of credit agreement
with a bank under which it can borrow up to $4,000,000. The line of credit bears
interest at the bank's prime rate (8.5% at April 30, 1999) and expires in August
1999. At April 30, 1999 there were borrowings of $1.2 million outstanding under
the line of credit agreement. The line of credit agreement is secured by
accounts receivable and inventories and contains certain financial covenants
measured on a monthly basis.
    
 
   
     As of April 30, 1999, Brocade had approximately $2.6 million due to the
same bank under an equipment loan agreement. The equipment loan agreement
provides for borrowings of up to $5,000,000. Borrowings are secured by the
related capital equipment, bear interest at the bank's prime rate plus 1.0% and
are payable through June 30, 2002. As of April 30, 1999, principal payments of
approximately $520,000, $783,000, $783,000 and $521,000, respectively, were due
in fiscal years ending October 31, 1999, 2000, 2001 and 2002.
    
 
   
     Notes payable as of October 31, 1997 and 1998 and April 30, 1999 consisted
of the following, (in thousands):
    
 
   
<TABLE>
<CAPTION>
                                                              OCTOBER 31,
                                                           -----------------     APRIL 30,
                                                            1997      1998         1999
                                                           ------    -------    -----------
                                                                                (UNAUDITED)
<S>                                                        <C>       <C>        <C>
Note payable to bank.....................................  $1,061    $ 2,962      $ 2,607
Less: Current portion....................................    (367)    (1,231)      (1,314)
                                                           ------    -------      -------
Long-term portion........................................  $  694    $ 1,731      $ 1,293
                                                           ======    =======      =======
</TABLE>
    
 
                                      F-12
<PAGE>   84
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
4.  COMMITMENTS AND CONTINGENCIES
 
   
     Brocade leases its facilities under operating lease agreements expiring
through November 2000. The leases require that Brocade pay all costs of
maintenance, utilities, insurance and taxes. Rent expense for the years ended
October 31, 1996, 1997 and 1998 was $110,509, $495,475 and $804,057
respectively.
    
 
     Brocade leases computers, office equipment and furniture under long-term
lease agreements that are classified as capital leases. The leases expire
through January 2001 and require a final buyout payment at the end of the lease
term.
 
   
     Future minimum lease payments, including the buyout payments, at October
31, 1998 were as follows:
    
 
   
<TABLE>
<CAPTION>
                                                              OPERATING    CAPITAL
                   YEAR ENDED OCTOBER 31,                      LEASES      LEASES
                   ----------------------                     ---------    -------
                                                                 (IN THOUSANDS)
<S>                                                           <C>          <C>
1999........................................................   $  792      $  926
2000........................................................      847         476
2001........................................................       --          42
                                                               ------      ------
Total minimum lease payments................................   $1,639       1,444
                                                               ======      ======
Less: Imputed interest (15.27% -- 17.65%)...................                 (182)
Present value of payments under capital leases..............                1,262
Less: Current portion.......................................                 (784)
                                                                           ------
Long-term capital lease obligations.........................               $  478
                                                                           ======
</TABLE>
    
 
   
     Brocade's former contract manufacturer has filed suit against Brocade,
alleging that Brocade is liable for breaching certain contracts with the
contract manufacturer. The suit claims damages in excess of $3.0 million plus
interest, an unspecified amount of consequential and incidental damages, costs
and attorneys' fees. Brocade has filed a cross complaint against the contract
manufacturer for various credits Brocade claims on its account with the contract
manufacturer. It is management's opinion that any liability on Brocade's account
is limited to accrued and unpaid invoices totaling approximately $900,000 and
that this $900,000 is subject to the various offsets Brocade claims in its
cross-complaint.
    
 
     Brocade is subject to various claims which arise in the normal course of
business. In the opinion of management, the ultimate disposition of these claims
will not have a material adverse effect on the financial position of Brocade.
 
5.  RESTRUCTURING OF OPERATIONS
 
   
     In the third quarter of 1998, Brocade initiated a plan to restructure its
operations to reduce its break even revenue level. In connection with this plan,
Brocade recorded a $3.2 million charge to operating expenses as follows: $1.3
million is included in cost of revenue, $700,000 is included in research and
development expense and $1.2 million is included in general and administrative
expense in the 1998 statement of operations. The restructuring charge includes
$1.7 million of employee related expenses for 20 employee terminations,
including severance of Brocade's former Chief Executive Officer, $1.2 million
for the write-off of excess equipment and inventories related to discontinued
and newly established contract manufacturer arrangements, and $300,000 for
write-offs of other tangible and intangible assets related to cancelled new
product development and simulation projects. As of April 30, 1999, Brocade had
    
 
                                      F-13
<PAGE>   85
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
5.  RESTRUCTURING OF OPERATIONS (CONTINUED)
   
incurred costs totaling $3.1 million related to the restructuring. The remaining
actions are expected to be completed within one year from the date the
restructuring plan was initiated. Accrued liabilities at April 30, 1999 include
$77,000 in remaining but unpaid employee related expenses.
    
 
6.  PREFERRED STOCK
 
Redeemable Convertible Preferred Stock
 
   
     In August 1995, Brocade issued 1,425,000 shares of its Series A Redeemable
Convertible Preferred Stock ("Series A"). In June 1996, Brocade issued 816,250
shares of its Series B Redeemable Convertible Preferred Stock ("Series B"). In
December 1996, Brocade issued 3,333,333 shares of its Series C Redeemable
Convertible Preferred Stock ("Series C"). In fiscal years 1997, 1998 and the six
months ended April 30, 1999 Brocade issued 2,795,848 shares, 865,052 shares and
223,182 shares, respectively, of its Series D Redeemable Convertible Preferred
Stock ("Series D"). The rights with respect to Series A, Series B, Series C and
Series D are as follows:
    
 
     Redemption. At the request of the holders of the majority of voting power
of the then outstanding preferred stock any time after August 28, 2002, Brocade
shall, to the extent funds are legally available, redeem the preferred stock in
increments over a three-year period. In such event, Brocade shall pay $1.00 per
share for Series A, $4.00 per share for Series B, $3.00 per share for Series C
and $5.78 for Series D plus any declared but unpaid dividends.
 
     Voting. Each share of Series A, Series B, Series C and Series D has voting
rights equal to an equivalent number of shares of common stock into which it is
convertible.
 
     Dividends. Holders of Series A, Series B, Series C and Series D are
entitled to receive noncumulative dividends when and as declared by the Board of
Directors at a rate of $0.08, $0.32, $0.24 and $0.46 per share, respectively,
per annum. After payment of such dividends, any additional dividends declared
will be paid to the holders of common stock and preferred stock in such amount
as they would be entitled to receive if their shares had been converted into
shares of common stock. No dividends have been declared.
 
     Liquidation. In the event of any liquidation, dissolution or winding up of
Brocade, including a merger or sale of all or substantially all of the assets,
the holders of Series A, Series B, Series C and Series D are entitled to receive
pari passu a distribution of $1.00, $4.00, $3.00 and $5.78 per share,
respectively, plus any declared but unpaid dividends prior to and in preference
to any distribution to the holders of common stock. The remaining assets, if
any, shall be distributed ratably among the holders of the common stock, Series
A, Series B, Series C and Series D, based on the number of shares held (assuming
conversion of the Series A, Series B, Series C and Series D).
 
     Conversion. Each share of Series A, Series B, Series C and Series D is
convertible into common stock, at the holder's option or upon the consent of the
holders of a majority of the then outstanding Series A, Series B, Series C and
Series D shares voting as a single class. The Series A, Series B, Series C and
Series D shares are initially convertible into common stock at a ratio of four
for one, two for one, one for one and one for one, respectively. The conversion
rates are protected by certain anti-dilution provisions. No adjustment in the
future conversion price of Series A, Series B, Series C or Series D shall be
made for the issuance of additional shares of common stock other than for a
common stock split, dividend, or distribution unless at the time of issuance of
the common stock the price per share for
 
                                      F-14
<PAGE>   86
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
6.  PREFERRED STOCK (CONTINUED)
additional shares of common stock issued is less than the conversion price in
effect for the Series A, Series B, Series C and Series D, respectively. The
Series A, Series B, Series C and Series D shares will automatically convert into
common stock upon the closing of a public offering having an aggregate public
offering price of at least $10,000,000.
 
Warrants
 
     Since inception, Brocade has issued warrants to purchase an aggregate of
51,197, 17,500 and 48,000 shares of Series A, Series B and Series C,
respectively. These warrants were issued in connection with equipment and
facilities lease agreements. Exercise prices range from $1.00 to $4.50 per
share. The warrants are exercisable at various dates through 2002.
 
   
     In connection with the initial sale and issuance of Series D, investors
were issued warrants to purchase 10% of the number of Series D shares purchased
by each investor at an exercise price of $6.78 per share. The total number of
shares of Series D purchasable upon exercise of these warrants was 296,881.
During the six months ended April 30, 1999, there were 223,182 of these warrants
exercised at an exercise price of $6.78 per share.
    
 
Pro Forma Shareholders' Deficit
 
   
     In January 1999, the Board of Directors authorized the filing of a
registration statement with the Securities and Exchange Commission to register
shares of its common stock in connection with a proposed initial public offering
("IPO"). If the IPO is consummated under the terms presently anticipated, (1)
all of the currently outstanding preferred stock will be converted into
14,549,915 shares of common stock upon the closing of the IPO and (2) warrants
to purchase 73,699 shares of Series D with an exercise price of $6.78 per share
will be exercised and converted into 73,699 shares of common stock prior to the
effective date of the IPO. The effect of the conversion and exercise of warrants
has been reflected as unaudited pro forma shareholders' equity in the
accompanying balance sheet as of April 30, 1999.
    
 
7.  COMMON STOCK
 
   
     At April 30, 1999, Brocade had reserved the following shares of authorized
but unissued shares of common stock for future issuance:
    
 
   
<TABLE>
<S>                                                           <C>
Conversion of outstanding Series A..........................   5,700,000
Conversion of outstanding Series B..........................   1,632,500
Conversion of outstanding Series C..........................   3,333,333
Conversion of outstanding Series D..........................   3,884,082
Conversion of warrants outstanding..........................     361,487
Stock option plans..........................................   2,775,477
                                                              ----------
                                                              17,686,879
                                                              ==========
</TABLE>
    
 
                                      F-15
<PAGE>   87
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
7.  COMMON STOCK (CONTINUED)
Deferred Compensation
 
   
     In connection with the grant of certain stock options to employees during
the year ended October 31, 1998 and the six months ended April 30, 1999, Brocade
recorded deferred compensation of approximately $307,000 and $5.1 million,
respectively, representing the difference between the deemed value of the common
stock for accounting purposes and the option exercise price of such options at
the date of grant. Such amount is presented as a reduction of stockholders'
equity and amortized ratably over the vesting period of the applicable options.
Approximately $7,000 and $1.4 million was expensed during the year ended October
31, 1998 and the six months ended April 30, 1999, respectively, and the balance
will be expensed ratably over the period the options vest. Compensation expense
is decreased in the period of forfeiture for any accrued but unvested
compensation arising from the early termination of an option holder's services.
No compensation expense related to any other periods presented has been
recorded.
    
 
Stock Options
 
     Brocade, under various stock option plans (the "Plans"), grants stock
options for shares of common stock to employees, directors and consultants of
Brocade. In accordance with the Plans, the stated exercise price shall not be
less than 85% of the estimated fair market value of common stock on the date of
grant. Incentive Stock Options ("ISOs") may not be granted at less than 100% of
the estimated fair market value of the common stock and stock options granted to
a person owning more than 10% of the combined voting power of all classes of
stock of Brocade must be issued at 110% of the fair market value of the stock on
the date of grant. The Plans provide that the options shall be exercisable over
a period not to exceed ten years, and the options generally vest over a period
of four years. The options typically vest 25% one year after the date of grant
and the remaining shares vest in equal monthly amounts over the following 36
months.
 
   
     At April 30, 1999, an aggregate of 348,080 shares were available for future
option grants under all of the Plans.
    
 
     Brocade accounts for the Plans under APB No. 25 whereby the difference
between the exercise price and the fair value at the date of grant is recognized
as compensation expense. Had compensation expense for the stock option plans
been determined consistent with SFAS No. 123, net losses would have increased to
the following pro forma amounts, (in thousands except per share data):
 
   
<TABLE>
<CAPTION>
                                                                                    SIX
                                                                                  MONTHS
                                                  YEAR ENDED OCTOBER 31,           ENDED
                                              ------------------------------     APRIL 30
                                               1996       1997        1998         1999
                                              -------    -------    --------    -----------
                                                                                (UNAUDITED)
<S>                                           <C>        <C>        <C>         <C>
Net loss as reported........................  $(3,934)   $(9,619)   $(15,111)     $(2,687)
Net loss Pro Forma..........................  $(3,945)   $(9,666)   $(15,522)     $(3,098)
Net loss per share as reported..............                        $  (4.44)     $  (.56)
Net loss per share Pro Forma................                        $  (4.57)     $  (.65)
</TABLE>
    
 
                                      F-16
<PAGE>   88
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
7.  COMMON STOCK (CONTINUED)
   
     The fair value of each option grant was estimated on the date of grant
using the Black-Scholes option pricing model with the following weighted average
assumptions used for grants in 1996, 1997, 1998 and the six months ended April
30, 1999, respectively: risk-free interest rate of 5.54 to 6.50, 5.71 to 6.63,
5.58 to 5.86 and 4.38 to 5.00 percent; expected dividend yields of zero percent
for all four periods; expected life of .5 years beyond vesting for all four
periods; and expected volatility of .0001% percent for all periods except the
six months ended April 30, 1999, for which a volatility factor of 60% was used.
    
 
     The following table summarizes stock option plan activity under all of the
Plans:
 
   
<TABLE>
<CAPTION>
                                                 YEAR ENDED                     YEAR ENDED
                                              OCTOBER 31, 1996               OCTOBER 31, 1997
                                        ----------------------------   ----------------------------
                                                         WEIGHTED                       WEIGHTED
                                                         AVERAGE                        AVERAGE
                                          SHARES      EXERCISE PRICE     SHARES      EXERCISE PRICE
                                        -----------   --------------   -----------   --------------
<S>                                     <C>           <C>              <C>           <C>
Outstanding at beginning of year......           --          --            584,000       $ .19
  Granted.............................    2,149,400       $ .09          1,315,500       $ .34
  Exercised...........................   (1,565,400)      $ .03           (630,666)      $ .26
  Cancelled...........................           --          --           (213,667)      $ .22
                                        -----------                    -----------
Outstanding at end of year............      584,000       $ .19          1,055,167       $ .33
                                        ===========                    ===========
Exercisable at end of year............           --          --             36,234       $ .22
Weighted fair value per share.........  $     .0100                    $     .0522
                                        ===========                    ===========
</TABLE>
    
 
   
<TABLE>
<CAPTION>
                                                 YEAR ENDED                  SIX MONTHS ENDED
                                              OCTOBER 31, 1998                APRIL 30, 1999
                                        ----------------------------   ----------------------------
                                                                               (UNAUDITED)
                                                         WEIGHTED                       WEIGHTED
                                                         AVERAGE                        AVERAGE
                                          SHARES      EXERCISE PRICE     SHARES      EXERCISE PRICE
                                        -----------   --------------   -----------   --------------
<S>                                     <C>           <C>              <C>           <C>
Outstanding at beginning of period....    1,055,167       $ .33          3,522,914       $1.85
  Granted.............................    3,154,912       $2.19          1,686,612       $3.88
  Exercised...........................     (425,570)      $1.04         (2,645,034)      $2.41
  Cancelled...........................     (261,595)      $1.06           (137,095)      $1.71
                                        -----------                    -----------
Outstanding at end of period..........    3,522,914       $1.85          2,427,397       $2.65
                                        ===========                    ===========
Exercisable at end of period..........      465,807       $1.52            298,098       $3.22
Weighted fair value per share.........  $     .3023                    $      1.46
                                        ===========                    ===========
</TABLE>
    
 
   
     During the six months ended April 30, 1999, the Board of Directors granted
options to purchase 330,000 shares at a price of $5.00 per share. These grants
were not part of the above plans and are included in the stock option table
above.
    
 
                                      F-17
<PAGE>   89
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
7.  COMMON STOCK (CONTINUED)
 
   
<TABLE>
<CAPTION>
                             OPTIONS OUTSTANDING                                 OPTIONS EXERCISABLE
- ------------------------------------------------------------------------------   --------------------
                                             (UNAUDITED)
                                                    WEIGHTED                                WEIGHTED
                                                     AVERAGE       WEIGHTED                  AVERAGE
            APRIL 30, 1999                          REMAINING      AVERAGE                  EXERCISE
       RANGE OF EXERCISE PRICES          NUMBER       YEARS     EXERCISE PRICE    NUMBER      PRICE
- --------------------------------------  ---------   ---------   --------------   --------   ---------
<S>                                     <C>         <C>         <C>              <C>        <C>
$0.200 - $1.800.......................    570,077     7.60          $0.73         73,044      $1.01
$2.250 - $7.000.......................  1,857,320     9.49          $3.24        225,054      $3.93
                                        ---------                                -------
$0.200 - $7.000.......................  2,427,397     9.05          $2.65        298,098      $3.22
                                        =========                                =======
</TABLE>
    
 
   
     At April 30, 1999, 2,545,770 shares issued upon exercise of stock options
with a weighted average exercise price of $2.33 and 150,944 shares issued to
founders with a weighted average exercise price of $.025 were subject to
repurchase by Brocade.
    
 
8.  INCOME TAXES
 
     Brocade accounts for income taxes pursuant to Statement of Financial
Accounting Standards (SFAS) No. 109, "Accounting for Income Taxes" ("SFAS No.
109"). A valuation allowance has been recorded for the total deferred tax assets
as a result of uncertainties regarding realization of the assets based upon the
limited operating history of Brocade, the lack of profitability to date and the
uncertainty of future profitability. The components of net deferred tax assets
are as follows (in thousands):
 
   
<TABLE>
<CAPTION>
                                                                  OCTOBER 31,
                                                              -------------------
                                                               1997        1998
                                                              -------    --------
<S>                                                           <C>        <C>
Net operating loss carryforwards............................  $ 4,600    $  8,100
Tax credit carryforwards....................................      700       1,400
Capitalized startup costs...................................      300         300
Reserves and accruals.......................................      300       2,200
Capitalized research expenditures...........................       --         700
                                                              -------    --------
  Total deferred tax assets.................................    5,900      12,700
Less: Valuation allowance...................................   (5,900)    (12,700)
                                                              -------    --------
  Net deferred tax assets...................................  $    --    $     --
                                                              =======    ========
</TABLE>
    
 
   
     As of October 31, 1998, Brocade had federal net operating loss
carryforwards of approximately $22.1 million and state net operating loss
carryforwards of approximately $10.0 million. The federal net operating loss and
other tax credit carryforwards expire on various dates beginning on 2010 through
2018. The state net operating loss carryforwards will expire beginning in 2003.
    
 
     Under current tax law, net operating loss and credit carryforwards
available to offset future income in any given year may be limited upon the
occurrence of certain events, including significant changes in ownership
interests.
 
                                      F-18
<PAGE>   90
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                   NOTES TO FINANCIAL STATEMENTS (CONTINUED)
 
9.  RELATED PARTY TRANSACTIONS
 
   
     During fiscal 1997, fiscal 1998, and the six months ended April 30, 1999,
Brocade sold 250,000, 225,000 and 2.3 million shares, respectively, of its
common stock to officers and a director of Brocade in consideration for full
recourse promissory notes in the aggregate amount of $6.5 million. Should the
officers terminate employment, these shares are subject to a right of repurchase
by Brocade. The right of repurchase lapses over a four year period. The notes
bear interest at various rates ranging from 4.47% to 6.5% per annum and mature
at various dates through April 2006.
    
 
   
10.  SUBSEQUENT EVENTS
    
 
Reincorporation, Amendment to the Articles of Incorporation
 
     In March 1999, Brocade's Board of Directors authorized the reincorporation
of Brocade in the State of Delaware. This reincorporation is to be effective
prior to Brocade's initial public offering. Upon reincorporation, Brocade will
be authorized to issue 50,000,000 shares of common stock, $.001 par value and
5,000,000 shares of undesignated preferred stock, $.001 par value.
 
   
1999 Employee Stock Purchase Plan
    
 
   
     In March 1999, the Board of Directors approved the adoption of Brocade's
1999 Employee Stock Purchase Plan (the "Purchase Plan"), and Brocade's
shareholders approved the Purchase Plan in April 1999. A total of 200,000 shares
of common stock have been reserved for issuance under the Purchase Plan. The
Purchase Plan permits eligible employees to purchase shares of common stock
through payroll deductions at 85% of the fair market value of the common stock,
as defined in the Purchase Plan.
    
 
   
1999 Stock Plan
    
 
   
     In March 1999, the Board of Directors approved Brocade's 1999 Stock Plan
(the "1999 Plan") and Brocade's shareholders approved the 1999 Plan in April
1999. The 1999 Plan provides for the grant of incentive stock options to
employees. A total of 300,000 shares of common stock have been reserved for
issuance under the 1999 Plan.
    
 
   
1999 Director Option Plan
    
 
   
     In March 1999, the Board of Directors approved the 1999 Director Option
Plan (the "Director Plan") and Brocade's shareholders approved the Director Plan
in April 1999. The Director Plan provides for the grant of common stock to
non-employee directors. A total of 200,000 shares of common stock have been
reserved for issuance under the Director Plan.
    
 
                                      F-19
<PAGE>   91
                      APPENDIX -- DESCRIPTION OF GRAPHICS


                                    GATEFOLD

Graphic:  Illustration of the Brocade Fabric.

Caption:  Current problem: Bottleneck in One-to-One Storage and Server 
Connectivity.

Caption:  The Brocade Solution: The BROCADE Fibre Channel Switched Fabric 
enables Any-to-Any Storage and Server Area Networking (SAN)

Credits:  Logos of the following companies: Compaq, Dell, StorageTek, McDATA, 
Cravel, Sequent
<PAGE>   92
 
                      (THIS PAGE INTENTIONALLY LEFT BLANK)
<PAGE>   93
 
                                 [BROCADE LOGO]
<PAGE>   94
 
                                    PART II
 
                     INFORMATION NOT REQUIRED IN PROSPECTUS
 
ITEM 13.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION.
 
     The following table sets forth all expenses to be paid by the Registrant,
other than underwriting discounts and commissions, in connection with this
offering. All amounts shown are estimates except for the registration fee.
 
   
<TABLE>
<CAPTION>
                                                              AMOUNT TO
                                                               BE PAID
                                                              ---------
<S>                                                           <C>
SEC registration fee........................................  $ 11,510
NASD filing fee.............................................     5,000
Nasdaq National Market listing fee..........................    90,000
Blue sky qualification fees and expenses....................     5,000
Printing and engraving expenses.............................   175,000
Legal fees and expenses.....................................   300,000
Accounting fees and expenses................................   250,000
Transfer agent and registrar fees...........................    10,000
Miscellaneous expenses......................................    28,490
                                                              --------
                                                              $875,000
                                                              ========
</TABLE>
    
 
ITEM 14.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.
 
     Section 145 of the Delaware General Corporation Law authorizes a court to
award, or a corporation's board of directors to grant, indemnity to officers,
directors and other corporate agents under certain circumstances and subject to
certain limitations. The Registrant's Certificate of Incorporation and Bylaws
provide that the Registrant shall indemnify its directors, officers, employees
and agents to the full extent permitted by the Delaware General Corporation Law,
including in circumstances in which indemnification is otherwise discretionary
under Delaware law. In addition, the Registrant intends to enter into separate
indemnification agreements with its directors, officers and certain employees
which would require the Registrant, among other things, to indemnify them
against certain liabilities which may arise by reason of their status as
directors, officers or certain other employees. The Registrant also intends to
maintain director and officer liability insurance, if available on reasonable
terms.
 
     These indemnification provisions and the indemnification agreement to be
entered into between the Registrant and its officers and directors may be
sufficiently broad to permit indemnification of the Registrant's officers and
directors for liabilities (including reimbursement of expenses incurred) arising
under the Securities Act.
 
     The Underwriting Agreement filed as Exhibit 1.1 to this Registration
Statement provides for indemnification by the underwriters of the Registrant and
its officers and directors for certain liabilities arising under the Securities
Act, or otherwise.
 
                                      II-1
<PAGE>   95
 
ITEM 15.  RECENT SALES OF UNREGISTERED SECURITIES.
 
     Since inception, we have issued and sold and issued the following
unregistered securities:
 
          1. On August 25, 1995, we sold 523,250 shares of our common stock to
     Kumar Malavalli, Paul R. Bonderson, Jr. and Seth D. Neiman, the founders of
     the Company, for an aggregate purchase price of $52,325.
 
   
          2. From inception through April 30, 1999, we granted stock options to
     purchase an aggregate of 7,976,424 shares of our common stock at exercise
     prices ranging from $.025 to $7.00 per share to employees, consultants,
     directors and other service providers pursuant to our 1995 Equity Incentive
     Plan, our 1998 Equity Incentive Plan and our 1998 Executive Equity
     Incentive Plan.
    
 
   
          3. From inception through April 30, 1999, we issued and sold an
     aggregate of 4,531,523 shares of our common stock to employees,
     consultants, directors and other service providers for aggregate
     consideration of approximately $5,375,591 pursuant to exercise of options
     granted under our 1995 Equity Incentive Plan, our 1998 Equity Incentive
     Plan and our 1998 Executive Equity Incentive Plan.
    
 
          4. On August 28, 1995, we sold 1,425,000 shares of Series A Preferred
     Stock for $1.00 per share to a group of private investors for an aggregate
     purchase price of $1,425,000.
 
          5. On December 26, 1995, we issued two warrants to an equipment lease
     financing company to purchase 15,753 and 35,444 shares of our Series A
     Preferred Stock at exercise prices of $4.50 and $1.00 per share,
     respectively.
 
          6. On June 5, 1996, we sold 386,764 shares of our common stock, for
     $.05 per share to Bruce L. Bergman, the former President and Chief
     Executive Officer of Brocade, for an aggregate purchase price of
     $19,338.20.
 
          7. On June 17, 1996, we sold 816,250 shares of our Series B Preferred
     Stock for $4.00 per share to a group of private investors for an aggregate
     purchase price of $3,265,000.
 
          8. On July 16, 1996, we issued 32,813 shares of Common Stock at $.05
     per share to a then-current officer of Brocade as partial commission in
     connection with the Series B Preferred Stock financing.
 
          9. On September 11, 1996, we issued a warrant to an equipment lease
     financing company to purchase 17,500 shares of our Series B Preferred Stock
     at an exercise price of $4.00 per share.
 
          10. On August 26, 1996, in connection with the lease of office space,
     we issued a warrant to a real property lessor to purchase 3,000 shares of
     our Series C Preferred Stock at an exercise price of $3.00 per share.
 
          11. On December 6, 1996, we sold 3,333,333 shares of our Series C
     Preferred Stock at $3.00 per share to a group of private investors for an
     aggregate purchase price of $9,999,999.
 
          12. On May 6, 1997, in connection with a sublease agreement, we issued
     a warrant to a sublessor of real property to purchase 20,000 shares of our
     Series C Preferred Stock at an exercise price of $3.00 per share.
 
          13. On June 13, 1997, in connection with a combined line of credit and
     equipment lease, we issued a warrant to a bank to purchase 25,000 shares of
     our Series C Preferred Stock at an exercise price of $3.00 per share.
 
                                      II-2
<PAGE>   96
 
   
          14. On September 29, 1997, November 17, 1997 and December 3, 1997, we
     sold 3,660,900 shares of our Series D Preferred Stock for $5.78 per share
     to a group of private investors for an aggregate purchase price of
     $21,160,002. In addition, in connection with the Series D financing, we
     issued warrants to purchase an aggregate of 296,881 shares of our Series D
     Preferred Stock at an exercise price of $6.78 per share of which 223,182
     have been exercised as of April 30, 1999.
    
 
          15. On July 13, 1998, we issued 18,000 shares of Common Stock at $2.25
     per share as partial compensation for the recruitment of the Company's new
     president.
 
   
          16. On April 1, 1999, we issued and sold an aggregate of 330,000
     shares of our common stock at $5.00 per share to an officer pursuant to a
     nonqualified stock option.
    
 
     For additional information concerning these equity investment transactions,
reference is made to the information contained under the caption "Certain
Transactions" in the form of prospectus included herein.
 
     The sales of the above securities were deemed to be exempt from
registration in reliance on Rule 701 promulgated under Section 3(b) under the
Securities Act as transactions pursuant to a compensatory benefit plan or a
written contract relating to compensation, or in reliance on Section 4(2) of the
Securities Act or Regulation D promulgated thereunder as transactions by an
issuer not involving any public offering. The recipients of securities in each
such transaction represented their intention to acquire the securities for
investment only and not with a view to or for sale in connection with any
distribution thereof and appropriate legends were affixed to the share
certificates and other instruments issued in such transactions. All recipients
either received adequate information about Brocade or had access, through
employment or other relationships, to such information.
 
ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES.
 
(a) EXHIBITS.
 
   
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                     DESCRIPTION OF DOCUMENT
- -------                     -----------------------
<C>       <S>
 1.1      Form of Underwriting Agreement.
 3.1**    Amended and Restated Articles of Incorporation of the
          Registrant.
 3.2**    Form of Amended and Restated Certificate of Incorporation to
          be effective on the closing of the offering made pursuant to
          this Registration Statement.
 3.3**    Bylaws of the Registrant.
 3.4**    Bylaws of the Registrant to be effective upon the closing of
          the offering made pursuant to this Registration Statement.
 4.1**    Form of Registrant's Common Stock certificate.
 4.2**    Warrant to purchase shares of Series A Preferred Stock of
          the Registrant issued to Venture Lending & Leasing, Inc.
 4.3**    First Amended and Restated Warrant to purchase shares of
          Series A Preferred Stock of the Registrant issued to Venture
          Lending & Leasing, Inc.
 4.4**    Warrant to purchase shares of Series B Preferred Stock of
          the Registrant issued to Venture Lending & Leasing, Inc.
 4.5**    Warrant to purchase shares of Series C Preferred Stock of
          the Registrant issued to Mason Calle De Luna L.P.
 4.6**    Warrant to purchase shares of Series C Preferred Stock of
          the Registrant issued to Symmetricom, Inc.
</TABLE>
    
 
                                      II-3
<PAGE>   97
 
   
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                     DESCRIPTION OF DOCUMENT
- -------                     -----------------------
<C>       <S>
 4.7**    Warrant to purchase shares of Series C Preferred Stock of
          the Registrant issued to Imperial Bank.
 4.8**    Seventh Amended and Restated Investors' Rights Agreement
          dated December 3, 1997.
 5.1      Opinion of Wilson Sonsini Goodrich & Rosati, Professional
          Corporation.
10.1**    Form of Indemnification Agreement to be entered into by the
          Registrant with each of its directors and executive
          officers.
10.2**    1995 Equity Incentive Plan and forms of agreements
          thereunder.
10.3**    1998 Equity Incentive Plan and forms of agreements
          thereunder.
10.4**    1998 Executive Equity Incentive Plan and forms of agreements
          thereunder.
10.5**    1999 Employee Stock Purchase Plan.
10.6**    1999 Director Option Plan and form of agreement thereunder.
10.7**    1999 Stock Plan and forms of agreements thereunder.
10.8**    Sublease between Symmetricom, Inc. and the Registrant dated
          May 6, 1997.
10.9**    Security and Loan Agreement between the Registrant and
          Imperial Bank dated June 19, 1997.
10.10**   Amendment to Loan Documents between the Registrant and
          Imperial Bank dated January 30, 1998.
10.11**   Second Amendment to Loan Documents between the Registrant
          and Imperial Bank dated August 17, 1998.
10.12**   Third Amendment to Loan Documents between the Registrant and
          Imperial Bank dated December 15, 1998.
10.13**   Master Equipment Lease Agreement between Venture Lending &
          Leasing, Inc. and the Registrant dated September 5, 1996.
10.14**+  Master Purchase Agreement between Dell Products L.P. and the
          Registrant dated November 1, 1998.
10.15**+  Purchase Agreement between Sequent Computer Systems, Inc.
          and the Registrant.
10.16**+  Supplement No. 1 to Purchase Agreement between Sequent
          Computer Systems, Inc. and the Registrant dated September
          26, 1997.
10.17**+  OEM Agreement between Storage Technology Corporation and the
          Registrant dated May 1, 1998.
10.18+    Acknowledgement between Wind River Systems, Inc. and the
          Registrant, dated April 22, 1999.
10.19**   Confidential Agreement and General Release of Claims between
          Bruce J. Bergman, The Bergman Family Trust and the
          Registrant dated September 23, 1998.
10.20     Letter Agreement with Michael J. Byrd dated April 5, 1999.
16.1**    Letter of PricewaterhouseCoopers LLP, Independent
          Accountants.
23.1      Consent of Arthur Andersen LLP, Independent Public
          Accountants
23.2      Consent of Counsel (included in Exhibit 5.1.).
24.1**    Power of Attorney (see page II-6 of the Registration
          Statement).
27.1      Financial Data Schedule.
</TABLE>
    
 
- -------------------------
   
** Previously filed.
    
 
 + Confidential treatment requested as to certain portions, which portions are
   omitted and filed separately with the Securities and Exchange Commission.
 
(b) FINANCIAL STATEMENT SCHEDULES.
 
<TABLE>
<S>                                                           <C>
     Schedule II -- Valuation and Qualifying Accounts.......  S-2**
</TABLE>
 
                                      II-4
<PAGE>   98
 
     Schedules not listed above have been omitted because the information
required to be set forth therein is not applicable or is shown in the
consolidated financial statements or notes thereto.
 
ITEM 17.  UNDERTAKINGS.
 
     The undersigned Registrant hereby undertakes to provide to the Underwriters
at the closing specified in the Underwriting Agreement certificates in such
denominations and registered in such names as required by the Underwriters to
permit prompt delivery to each purchaser.
 
     Insofar as indemnification by the Registrant for liabilities arising under
the Securities Act may be permitted to directors, officers and controlling
persons of the Registrant pursuant to the provisions described in Item 14 above
or otherwise, the Registrant has been advised that in the opinion of the
Securities and Exchange Commission such indemnification is against public policy
as expressed in the Securities Act, and is, therefore, unenforceable. In the
event that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a director, officer,
or controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the
Securities Act and will be governed by the final adjudication of such issue.
 
     The undersigned Registrant hereby undertakes that:
 
          (1) For purposes of determining any liability under the Securities
     Act, the information omitted from the form of prospectus filed as part of
     this registration statement in reliance upon Rule 430A and contained in a
     form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
     (4) or 497(h) under the Securities Act shall be deemed to be part of this
     registration statement as of the time it was declared effective.
 
          (2) For the purpose of determining any liability under the Securities
     Act, each post-effective amendment that contains a form of prospectus shall
     be deemed to be a new registration statement relating to the securities
     offered therein, and the offering of such securities at the time shall be
     deemed to be the initial bona fide offering thereof.
 
                                      II-5
<PAGE>   99
 
                                   SIGNATURES
 
   
     Pursuant to the requirements of the Securities Act of 1933, the Registrant
has duly caused this Amendment to Registration Statement on Form S-1 to be
signed on its behalf by the undersigned, thereunto duly authorized, in the City
of San Jose, County of Santa Clara, State of California, on the 5th day of May
1999.
    
 
                                          BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                                          By:     /s/ GREGORY L. REYES
                                            ------------------------------------
                                                      Gregory L. Reyes
                                               President and Chief Executive
                                                           Officer
                                               (Principal Executive Officer)
 
     Pursuant to the requirements of the Securities Act of 1933, this Amendment
to the Registration Statement has been signed by the following persons in the
capacities and on the dates indicated:
 
   
<TABLE>
<CAPTION>
                  SIGNATURE                                    TITLE                      DATE
                  ---------                                    -----                      ----
<C>                                            <S>                                     <C>
                      *                        Chairman of the Board                   May 5, 1999
 ------------------------------------------
               Seth D. Neiman
 
            /s/ GREGORY L. REYES               President and Chief Executive Officer   May 5, 1999
 ------------------------------------------    (Principal Executive Officer)
              Gregory L. Reyes
 
             /s/ MICHAEL J. BYRD               Vice President, Finance and Chief       May 5, 1999
 ------------------------------------------    Financial Officer (Principal Financial
               Michael J. Byrd                 and Accounting Officer)
 
                                               Director
 ------------------------------------------
                Neal Dempsey
 
                      *                        Director                                May 5, 1999
 ------------------------------------------
                 Mark Leslie
 
                      *                        Director                                May 5, 1999
 ------------------------------------------
              Larry W. Sonsini
</TABLE>
    
 
* Power of Attorney
By: /s/ GREGORY L. REYES
    --------------------------------------------------
    Gregory L. Reyes
 
                                      II-6
<PAGE>   100
 
     After the reincorporation discussed in Note 10 to Brocade Communications
Systems, Inc.'s financial statements, we expect to be in a position to render
the following audit report:
 
                                          ARTHUR ANDERSEN LLP
 
San Jose, California
November 24, 1998
 
              REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS ON SCHEDULE
 
To the Board of Directors and Shareholders
of Brocade Communications Systems, Inc.
 
     We have audited, in accordance with generally accepted auditing standards,
the financial statements of Brocade Communications Systems, Inc. included in
this Registration Statement and have issued our report thereon dated November
24, 1998. Our audits were made for the purpose of forming an opinion on the
basic financial statements taken as a whole. The accompanying schedule is the
responsibility of the Company's management and is presented for the purpose of
complying with the Securities and Exchange Commission's rules and is not part of
the basic financial statements. This schedule has been subjected to the auditing
procedures applied in the audit of the basic financial statements and, in our
opinion, fairly states in all material respects the financial data required to
be set forth therein in relation to the basic financial statements taken as a
whole.
 
                                          ARTHUR ANDERSEN LLP
 
San Jose, California
November 24, 1998
 
                                       S-1
<PAGE>   101
 
                      BROCADE COMMUNICATIONS SYSTEMS, INC.
 
                SCHEDULE II -- VALUATION AND QUALIFYING ACCOUNTS
 
   
<TABLE>
<CAPTION>
                                               COLUMN B      COLUMN C     COLUMN D     COLUMN E
                                              -----------   ----------   ----------    --------
                  COLUMN A                    BALANCE AT    CHARGED TO                 BALANCE
- --------------------------------------------   BEGINNING    COSTS AND                   AT END
                DESCRIPTION                     OF YEAR      EXPENSES    DEDUCTIONS    OF YEAR
- --------------------------------------------  -----------   ----------   ----------    --------
<S>                                           <C>           <C>          <C>           <C>
Year ended October 31, 1996:
Allowance for doubtful accounts.............   $     --     $       --   $       --    $     --
Year ended October 31, 1997:
Allowance for doubtful accounts.............   $     --     $  100,000   $       --    $100,000
Year ended October 31, 1998:
Allowance for returns and doubtful
  accounts..................................   $100,000     $  185,000   $       --    $285,000
 
Year ended October 31, 1998:
Restructuring Accrual.......................   $     --     $3,200,000   $2,779,000(1) $421,000
</TABLE>
    
 
- -------------------------
   
(1) This amount includes $300,000 in cash severance payments, $1,000,000 in
    noncash compensation charges related to stock severance arrangements and
    $1,500,000 in asset write-offs.
    
 
                                       S-2
<PAGE>   102
 
                               INDEX TO EXHIBITS
 
   
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                     DESCRIPTION OF DOCUMENT
- -------                     -----------------------
<C>       <S>
  1.1     Form of Underwriting Agreement.
  3.1**   Amended and Restated Articles of Incorporation of the
          Registrant.
  3.2**   Form of Amended and Restated Certificate of Incorporation to
          be effective on the closing of the offering made pursuant to
          this Registration Statement.
  3.3**   Bylaws of the Registrant.
  3.4**   Bylaws of the Registrant to be effective upon the closing of
          the offering made pursuant to this Registration Statement.
  4.1**   Form of Registrant's Common Stock certificate.
  4.2**   Warrant to purchase shares of Series A Preferred Stock of
          the Registrant issued to Venture Lending & Leasing, Inc.
  4.3**   First Amended and Restated Warrant to purchase shares of
          Series A Preferred Stock of the Registrant issued to Venture
          Lending & Leasing, Inc.
  4.4**   Warrant to purchase shares of Series B Preferred Stock of
          the Registrant issued to Venture Lending & Leasing, Inc.
  4.5**   Warrant to purchase shares of Series C Preferred Stock of
          the Registrant issued to Mason Calle De Luna L.P.
  4.6**   Warrant to purchase shares of Series C Preferred Stock of
          the Registrant issued to Symmetricom, Inc.
  4.7**   Warrant to purchase shares of Series C Preferred Stock of
          the Registrant issued to Imperial Bank.
  4.8**   Seventh Amended and Restated Investors' Rights Agreement
          dated December 3, 1997.
  5.1     Opinion of Wilson Sonsini Goodrich & Rosati, Professional
          Corporation.
 10.1**   Form of Indemnification Agreement to be entered into by the
          Registrant with each of its directors and executive
          officers.
 10.2**   1995 Equity Incentive Plan and forms of agreements
          thereunder.
 10.3**   1998 Equity Incentive Plan and forms of agreements
          thereunder.
 10.4**   1998 Executive Equity Incentive Plan and forms of agreements
          thereunder.
 10.5**   1999 Employee Stock Purchase Plan.
 10.6**   1999 Director Option Plan and form of agreement thereunder.
 10.7**   1999 Stock Plan and forms of agreements thereunder.
 10.8**   Sublease between Symmetricom, Inc. and the Registrant dated
          May 6, 1997.
 10.9**   Security and Loan Agreement between the Registrant and
          Imperial Bank dated June 19, 1997.
 10.10**  Amendment to Loan Documents between the Registrant and
          Imperial Bank dated January 30, 1998.
 10.11**  Second Amendment to Loan Documents between the Registrant
          and Imperial Bank dated August 17, 1998.
 10.12**  Third Amendment to Loan Documents between the Registrant and
          Imperial Bank dated December 15, 1998.
 10.13**  Master Equipment Lease Agreement between Venture Lending &
          Leasing, Inc. and the Registrant dated September 5, 1996.
 10.14**+ Master Purchase Agreement between Dell Products L.P. and the
          Registrant dated November 1, 1998.
 10.15**+ Purchase Agreement between Sequent Computer Systems, Inc.
          and the Registrant.
 10.16**+ Supplement No. 1 to Purchase Agreement between Sequent
          Computer Systems, Inc. and the Registrant dated September
          26, 1997.
</TABLE>
    
<PAGE>   103
 
   
<TABLE>
<CAPTION>
EXHIBIT
 NUMBER                     DESCRIPTION OF DOCUMENT
- -------                     -----------------------
<C>       <S>
 10.17**+ OEM Agreement between Storage Technology Corporation and the
          Registrant dated May 1, 1998.
 10.18+   Acknowledgement between Wind River Systems, Inc. and the
          Registrant, dated April 22, 1999.
 10.19**  Confidential Agreement and General Release of Claims between
          Bruce J. Bergman, The Bergman Family Trust and the
          Registrant dated September 23, 1998.
 10.20    Letter Agreement with Michael J. Byrd dated April 5, 1999.
 16.1**   Letter of PricewaterhouseCoopers LLP, Independent
          Accountants.
 23.1     Consent of Arthur Andersen LLP, Independent Public
          Accountants.
 23.2     Consent of Counsel (included in Exhibit 5.1.).
 24.1**   Power of Attorney (see page II-6 of the Registration
          Statement).
 27.1     Financial Data Schedule.
</TABLE>
    
 
- -------------------------
   
** Previously filed.
    
 + Confidential treatment requested as to certain portions, which portions are
   omitted and filed separately with the Securities and Exchange Commission.

<PAGE>   1

                                                                     EXHIBIT 1.1







                             _______________ SHARES


                      BROCADE COMMUNICATIONS SYSTEMS, INC.

                    COMMON STOCK, PAR VALUE $0.001 PER SHARE







                             UNDERWRITING AGREEMENT





_________________, 1999


<PAGE>   2

                                                             _____________, 1999


Morgan Stanley & Co. Incorporated
BT Alex. Brown Incorporated
Dain Rauscher Wessels, a division of
    Dain Rauscher Incorporated
c/o Morgan Stanley & Co. Incorporated
1585 Broadway
New York, New York  10036

Dear Sirs and Mesdames:

        Brocade Communications Systems, Inc., a Delaware corporation (the
"COMPANY"), proposes to issue and sell to the several Underwriters named in
Schedule I hereto (the "UNDERWRITERS") _______________ shares of its Common
Stock, par value $0.001 per share (the "FIRM SHARES"). The Company also proposes
to issue and sell to the several Underwriters not more than an additional
______________ shares of its Common Stock, par value $0.001 per share (the
"ADDITIONAL SHARES") if and to the extent that you, as Managers of the offering,
shall have determined to exercise, on behalf of the Underwriters, the right to
purchase such shares of common stock granted to the Underwriters in Section 2
hereof. The Firm Shares and the Additional Shares are hereinafter collectively
referred to as the "SHARES." The shares of Common Stock, par value $0.001 per
share, of the Company to be outstanding after giving effect to the sales
contemplated hereby are hereinafter referred to as the "COMMON STOCK."

        The Company has filed with the Securities and Exchange Commission (the
"COMMISSION") a registration statement, including a prospectus, relating to the
Shares. The registration statement as amended at the time it becomes effective,
including the information (if any) deemed to be part of the registration
statement at the time of effectiveness pursuant to Rule 430A under the
Securities Act of 1933, as amended (the "SECURITIES ACT"), is hereinafter
referred to as the "REGISTRATION STATEMENT"; the prospectus in the form first
used to confirm sales of Shares is hereinafter referred to as the "PROSPECTUS."
If the Company has filed an abbreviated registration statement to register
additional shares of Common Stock pursuant to Rule 462(b) under the Securities
Act (the "RULE 462 REGISTRATION STATEMENT"), then any reference herein to the
term "REGISTRATION STATEMENT" shall be deemed to include such Rule 462
Registration Statement.

               As part of the offering contemplated by this Agreement, Morgan
Stanley & Co. Incorporated ("MORGAN STANLEY") has agreed to reserve out of the
Shares set forth opposite its name on Schedule I to this Agreement, up to
________________ Shares, for sale to the Company's employees, officers, and
directors and other parties associated with the Company (collectively,
"PARTICIPANTS"), as set forth in the Prospectus under the heading "Underwriting"
(the "DIRECTED SHARE PROGRAM"). The Shares to be sold by Morgan Stanley pursuant
to the Directed Share Program (the "DIRECTED SHARES") will be sold by Morgan
Stanley pursuant to this 



<PAGE>   3

Agreement at the public offering price. Any Directed Shares not orally confirmed
for purchase by any Participants by the end of the first business day after the
date on which this Agreement is executed will be offered to the public by Morgan
Stanley as set forth in the Prospectus.

        1. Representations and Warranties. The Company represents and warrants
to and agrees with each of the Underwriters that:

                (a) The Registration Statement has become effective; no stop
order suspending the effectiveness of the Registration Statement is in effect,
and no proceedings for such purpose are pending before or threatened by the
Commission.

                (b) (i) The Registration Statement, when it became effective,
did not contain and, as amended or supplemented, if applicable, will not contain
any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary to make the statements therein not
misleading, (ii) the Registration Statement and the Prospectus comply and, as
amended or supplemented, if applicable, will comply in all material respects
with the Securities Act and the applicable rules and regulations of the
Commission thereunder and (iii) the Prospectus does not contain and, as amended
or supplemented, if applicable, will not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements
therein, in the light of the circumstances under which they were made, not
misleading, except that the representations and warranties set forth in this
paragraph do not apply to statements or omissions in the Registration Statement
or the Prospectus based upon information relating to any Underwriter furnished
to the Company in writing by such Underwriter through you expressly for use
therein.

                (c) The Company has been duly incorporated, is validly existing
as a corporation in good standing under the laws of the State of Delaware, has
the corporate power and authority to own its property and to conduct its
business as described in the Prospectus and is duly qualified to transact
business and is in good standing in each jurisdiction in which the conduct of
its business or its ownership or leasing of property requires such
qualification, except to the extent that the failure to be so qualified or be in
good standing would not have a material adverse effect on the Company. The
execution and delivery of the Agreement and Plan of Merger dated as of
__________, 1999 (the "Merger Agreement") between Brocade Communications
Systems, Inc., a California corporation (the "California Corporation"), and the
Company, effecting the reincorporation of the California Corporation under the
laws of the State of Delaware, was duly authorized by all necessary corporate
action on the part of each of the California Corporation and the Company. Each
of the California Corporation and the Company had all corporate power and
authority to execute and deliver the Merger Agreement, to file the Merger
Agreement with the Secretary of State of California and the Secretary of State
of Delaware and to consummate the reincorporation contemplated by the Merger
Agreement, and the Merger Agreement at the time of execution and filing
constituted a valid and binding obligation of each of the California Corporation
and the Company, enforceable in accordance with its terms. Other than Brocade
Communications Systems, Inc., a Delaware corporation, the Company has no
subsidiary or subsidiaries and does not control, directly or indirectly, any
corporation, partnership, joint venture, association or other business
organization.



                                       2
<PAGE>   4

                (d) This Agreement has been duly authorized, executed and
delivered by the Company.

                (e) The authorized capital stock of the Company conforms as to
legal matters to the description thereof contained in the Prospectus.

                (f) The shares of Common Stock outstanding prior to the issuance
of the Shares have been duly authorized and are validly issued, fully paid and
non-assessable.

                (g) The Shares have been duly authorized and, when issued and
delivered in accordance with the terms of this Agreement, will be validly
issued, fully paid and non-assessable, and the issuance of such Shares will not
be subject to any preemptive or similar rights.

                (h) The execution and delivery by the Company of, and the
performance by the Company of its obligations under, this Agreement will not
contravene any provision of applicable law or the certificate of incorporation
or by-laws of the Company or any agreement or other instrument binding upon the
Company that is material to the Company, or any judgment, order or decree of any
governmental body, agency or court having jurisdiction over the Company, and no
consent, approval, authorization or order of, or qualification with, any
governmental body or agency is required for the performance by the Company of
its obligations under this Agreement, except such as may be required by the
securities or Blue Sky laws of the various states in connection with the offer
and sale of the Shares.

                (i) There has not occurred any material adverse change, or any
development involving a prospective material adverse change, in the condition,
financial or otherwise, or in the earnings, business or operations of the
Company, from that set forth in the Prospectus (exclusive of any amendments or
supplements thereto subsequent to the date of this Agreement).

                (j) There are no legal or governmental proceedings pending or
threatened to which the Company is a party or to which any of the properties of
the Company is subject that are required to be described in the Registration
Statement or the Prospectus and are not so described or any statutes,
regulations, contracts or other documents that are required to be described in
the Registration Statement or the Prospectus or to be filed as exhibits to the
Registration Statement that are not described or filed as required.

                (k) Each preliminary prospectus filed as part of the
registration statement as originally filed or as part of any amendment thereto,
or filed pursuant to Rule 424 under the Securities Act, complied when so filed
in all material respects with the Securities Act and the applicable rules and
regulations of the Commission thereunder, except for the omission of a price
range and other information derived therefrom.

                (l) The Company is not and, after giving effect to the offering
and sale of the Shares and the application of the proceeds thereof as described
in the Prospectus, will not be an "investment company" as such term is defined
in the Investment Company Act of 1940, as amended.



                                       3
<PAGE>   5

                (m) The Company (i) is in compliance with any and all applicable
foreign, federal, state and local laws and regulations relating to the
protection of human health and safety, the environment or hazardous or toxic
substances or wastes, pollutants or contaminants ("ENVIRONMENTAL LAWS"), (ii)
has received all permits, licenses or other approvals required of it under
applicable Environmental Laws to conduct its business and (iii) is in compliance
with all terms and conditions of any such permit, license or approval, except
where such noncompliance with Environmental Laws, failure to receive required
permits, licenses or other approvals or failure to comply with the terms and
conditions of such permits, licenses or approvals would not, singly or in the
aggregate, have a material adverse effect on the Company.

                (n) There are no costs or liabilities associated with
Environmental Laws (including, without limitation, any capital or operating
expenditures required for clean-up, closure of properties or compliance with
Environmental Laws or any permit, license or approval, any related constraints
on operating activities and any potential liabilities to third parties) which
would, singly or in the aggregate, have a material adverse effect on the
Company.

                (o) There are no contracts, agreements or understandings between
the Company and any person granting such person the right to require the Company
to file a registration statement under the Securities Act with respect to any
securities of the Company or to require the Company to include such securities
with the Shares registered pursuant to the Registration Statement, except as
described in the Prospectus.

                (p) The Company has complied with all provisions of Section
517.075, Florida Statutes relating to doing business with the Government of Cuba
or with any person or affiliate located in Cuba.

                (q) Subsequent to the respective dates as of which information
is given in the Registration Statement and the Prospectus, (i) the Company has
not incurred any material liability or obligation, direct or contingent, nor
entered into any material transaction not in the ordinary course of business;
(ii) the Company has not purchased any of its outstanding capital stock, nor
declared, paid or otherwise made any dividend or distribution of any kind on its
capital stock other than ordinary and customary dividends; and (iii) there has
not been any material change in the capital stock, short-term debt or long-term
debt of the Company, except in each case as described in the Prospectus.

                (r) The Company has good and marketable title in fee simple to
all real property and good and marketable title to all personal property owned
by it which is material to the business of the Company free and clear of all
liens, encumbrances and defects except such as are described in the Prospectus
or such as do not materially affect the value of such property and do not
interfere with the use made and proposed to be made of such property by the
Company; and any real property and buildings held under lease by the Company are
held by them under valid, subsisting and enforceable leases with such exceptions
as are not material and do not interfere with the use made and proposed to be
made of such property and buildings by the Company, except as described in the
Prospectus.



                                       4
<PAGE>   6

                (s) The Company owns or possesses, or can acquire on reasonable
terms, adequate licenses or other rights to use all material patents, patent
rights, licenses, inventions, copyrights, know-how (including trade secrets and
other unpatented and/or unpatentable proprietary or confidential information,
systems or procedures), trademarks, service marks and trade names currently
employed by it to conduct its business in the manner described in the Prospectus
(collectively, the "INTELLECTUAL PROPERTY"), and the Company has not received
any notice of infringement of or conflict with asserted rights of others with
respect to any of the Intellectual Property which, singly or in the aggregate,
if the subject of an unfavorable decision, ruling or finding, would have a
material adverse effect on the Company. To the knowledge of the Company, there
are no rights of third parties to any of the Intellectual Property, other than
licenses granted in the ordinary course of business. To the knowledge of the
Company, there is no material infringement by third parties of any of the
Intellectual Property. There is no pending or, to the knowledge of the Company,
threatened action, suit, proceeding or claim by others challenging the Company's
rights in or to any of the Intellectual Property, and the Company is unaware of
any facts which would form a reasonable basis for any such claim. There is no
pending, or to the knowledge of the Company, threatened action, suit, proceeding
or claim by others challenging the validity or scope of any of the Intellectual
Property, and the Company is unaware of any facts which would form a reasonable
basis for any such claim. There is no pending or, to the knowledge of the
Company, threatened action, suit, proceeding or claim by others that the Company
infringes or otherwise violates any patent, trademark, copyright, trade secret
or other proprietary rights of others, and the Company is unaware of any other
fact which would form a reasonable basis for any such claim. To the Company's
knowledge, all patents owned by the Company are valid and enforceable.

                (t) No material labor dispute with the employees of the Company
exists, except as described in the Prospectus, or, to the knowledge of the
Company, is imminent; and without conducting any independent investigation, the
Company is not aware of any existing, threatened or imminent labor disturbance
by the employees of any of its principal suppliers, manufacturers or contractors
that could reasonably be expected to have a material adverse effect on the
Company.

                (u) The Company is insured by insurers of recognized financial
responsibility against such losses and risks and in such amounts as are prudent
and customary in the businesses in which it is engaged; the Company has not been
refused any insurance coverage sought or applied for; and the Company does not
have any reason to believe that it will not be able to renew its existing
insurance coverage as and when such coverage expires or to obtain similar
coverage from similar insurers as may be necessary to continue its business at a
cost that would not have a material adverse effect on the Company, except as
described in the Prospectus.

                (v) The Company possesses all certificates, authorizations and
permits issued by the appropriate federal, state or foreign regulatory
authorities necessary to conduct its business, and the Company has not received
any notice of proceedings relating to the revocation or modification of any such
certificate, authorization or permit which, singly or in the aggregate, if the
subject of an unfavorable decision, ruling or finding, would have a material
adverse effect on the Company, except as described the Prospectus.



                                       5
<PAGE>   7

                (w) The Company maintains a system of internal accounting
controls sufficient to provide reasonable assurance that (i) transactions are
executed in accordance with management's general or specific authorizations;
(ii) transactions are recorded as necessary to permit preparation of financial
statements in conformity with generally accepted accounting principles and to
maintain asset accountability; (iii) access to assets is permitted only in
accordance with management's general or specific authorization; and (iv) the
recorded accountability for assets is compared with the existing assets at
reasonable intervals and appropriate action is taken with respect to any
differences.

                (x) The Company has filed all foreign, federal, state and local
tax returns that are required to be filed or has requested extensions thereof
(except in any case in which the failure so to file would not have a material
adverse effect on the Company) and has paid all taxes required to be paid by it
and any other assessment, fine or penalty levied against it, to the extent that
any of the foregoing is due and payable, except for any such assessment, fine or
penalty that is currently being contested in good faith or as could not
reasonably be expected to have a material adverse effect on the Company.

                (y) The Company has fulfilled its obligations, if any, under the
minimum funding standards of Section 302 of the United States Employee
Retirement Income Security Act of 1974 ("ERISA") and the regulations and
published interpretations thereunder with respect to each "plan" (as defined in
Section 3(3) of ERISA and such regulations and published interpretations) in
which employees of the Company are eligible to participate. Each such plan is in
compliance in all respects with the presently applicable provisions of ERISA and
such regulations and published interpretations, except where the failure to so
comply could not reasonably be expected, individually or in the aggregate, to
have a material adverse effect on the Company. The Company has not incurred any
unpaid liability to the Pension Benefit Guaranty Corporation (other than for the
payment of premiums in the ordinary course) or to any such plan under Title IV
of ERISA.

                (z) The Company has reviewed its operations to evaluate the
extent to which the business or operations of the Company will be affected by
the Year 2000 Problem (that is, any significant risk that computer hardware or
software applications used or distributed by the Company will not, in the case
of dates or time periods occurring after December 31, 1999, function at least as
effectively as in the case of dates or time periods occurring prior to January
1, 2000); as a result of such review, (i) the Company has no reason to believe,
and does not believe, that (A) there are any issues related to the Company's
preparedness to address the Year 2000 Problem that are of a character required
to be described or referred to in the Registration Statement or Prospectus which
have not been accurately described in the Registration Statement or Prospectus
and (B) the Year 2000 Problem will have a material adverse effect on the
Company, or result in any material loss or interference with the business or
operations of the Company; and (ii) except as described in the Prospectus, the
Company reasonably believes, after due inquiry, that the suppliers, vendors,
customers or other material third parties used or served by the Company and such
subsidiaries are addressing or will address the Year 2000 Problem in a timely
manner, except to the extent that a failure to address the Year 2000 Problem by
any supplier, vendor, customer or material third party would not have a material
adverse effect on the Company.



                                       6
<PAGE>   8

                (aa) The Company has not received any notice or communication
(in writing or otherwise), or any other information, indicating that there is a
material possibility that any customer of the Company identified in the
"Business--Customers" section of the Registration Statement will cease dealing
with the Company or otherwise materially reduce the volume of business
transacted by such customer with the Company below historical levels.

        Furthermore, the Company represents and warrants to Morgan Stanley that
(i) the Registration Statement, the Prospectus and any preliminary prospectus
comply, and any further amendments or supplements thereto will comply, with any
applicable laws or regulations of foreign jurisdictions in which the Prospectus
or any preliminary prospectus, as amended or supplemented, if applicable, are
distributed in connection with the Directed Share Program, and that (ii) no
authorization, approval, consent, license, order, registration or qualification
of or with any government, governmental instrumentality or court, other than
such as have been obtained, is necessary under the securities laws and
regulations of foreign jurisdictions in which the Directed Shares are offered
outside the United States.

        The Company has not offered, or caused the Underwriters to offer, Shares
to any person pursuant to the Directed Share Program with the specific intent to
unlawfully influence (i) a customer or supplier of the Company to alter the
customer's or supplier's level or type of business with the Company, or (ii) a
trade journalist or publication to write or publish favorable information about
the Company or its products.

        2. Agreements to Sell and Purchase. The Company hereby agrees to sell to
the several Underwriters, and each Underwriter, upon the basis of the
representations and warranties herein contained, but subject to the conditions
hereinafter stated, agrees, severally and not jointly, to purchase from the
Company the respective numbers of Firm Shares set forth in Schedule I hereto
opposite its name at $______ a share (the "PURCHASE PRICE").

        On the basis of the representations and warranties contained in this
Agreement, and subject to its terms and conditions, the Company agrees to sell
to the Underwriters the Additional Shares, and the Underwriters shall have a
one-time right to purchase, severally and not jointly, up to _______________
Additional Shares at the Purchase Price. If you, on behalf of the Underwriters,
elect to exercise such option, you shall so notify the Company in writing not
later than 30 days after the date of this Agreement, which notice shall specify
the number of Additional Shares to be purchased by the Underwriters and the date
on which such Additional Shares are to be purchased. Such date may be the same
as the Closing Date (as defined below) but not earlier than the Closing Date nor
later than ten business days after the date of such notice. Additional Shares
may be purchased as provided in Section 4 hereof solely for the purpose of
covering over-allotments made in connection with the offering of the Firm
Shares. If any Additional Shares are to be purchased, each Underwriter agrees,
severally and not jointly, to purchase the number of Additional Shares (subject
to such adjustments to eliminate fractional shares as you may determine) that
bears the same proportion to the total number of Additional Shares to be
purchased as the number of Firm Shares set forth in Schedule I hereto opposite
the name of such Underwriter bears to the total number of Firm Shares.



                                       7
<PAGE>   9

        The Company hereby agrees that, without the prior written consent of
Morgan Stanley on behalf of the Underwriters, it will not, during the period
ending 180 days after the date of the Prospectus, (i) offer, pledge, sell,
contract to sell, sell any option or contract to purchase, purchase any option
or contract to sell, grant any option, right or warrant to purchase, lend, or
otherwise transfer or dispose of, directly or indirectly, any shares of Common
Stock or any securities convertible into or exercisable or exchangeable for
Common Stock or (ii) enter into any swap or other arrangement that transfers to
another, in whole or in part, any of the economic consequences of ownership of
the Common Stock, whether any such transaction described in clause (i) or (ii)
above is to be settled by delivery of Common Stock or such other securities, in
cash or otherwise. The foregoing sentence shall not apply to (A) the Shares to
be sold hereunder, (B) the issuance by the Company of shares of Common Stock
upon the exercise of an option or warrant or the conversion of a security
outstanding on the date hereof which is described in the Prospectus or of which
the Underwriters have been advised in writing, or (C) any options to purchase
Common Stock, or shares of Common Stock issued by the Company upon the exercise
of such options, granted under the Company's stock option or employee stock
purchase plans described in the Prospectus.

        3. Terms of Public Offering. The Company is advised by you that the
Underwriters propose to make a public offering of their respective portions of
the Shares as soon after the Registration Statement and this Agreement have
become effective as in your judgment is advisable. The Company is further
advised by you that the Shares are to be offered to the public initially at
$_____________ a share (the "PUBLIC OFFERING PRICE") and to certain dealers
selected by you at a price that represents a concession not in excess of
$_____________ a share under the Public Offering Price, and that any Underwriter
may allow, and such dealers may reallow, a concession, not in excess of
$_____________ a share, to any Underwriter or to certain other dealers.

        4. Payment and Delivery. Payment for the Firm Shares shall be made to
the Company in Federal or other funds immediately available in New York City
against delivery of such Firm Shares for the respective accounts of the several
Underwriters at a closing to be held at the offices of Wilson Sonsini Goodrich &
Rosati, Professional Corporation at 10:00 a.m., New York City time, on
_____________, 1999, or at such other time on the same or such other date, not
later than _____________, 1999, as shall be designated in writing by you. The
time and date of such payment are hereinafter referred to as the "CLOSING DATE".

        Payment for any Additional Shares shall be made to the Company in
Federal or other funds immediately available in New York City against delivery
of such Additional Shares for the respective accounts of the several
Underwriters at a closing to be held at the offices of Wilson Sonsini Goodrich &
Rosati, Professional Corporation at 10:00 a.m., New York City time, on the date
specified in the notice described in Section 2 or at such other time on the same
or on such other date, in any event not later than _____________, 1999, as shall
be designated in writing by you. The time and date of such payment are
hereinafter referred to as the "OPTION CLOSING DATE".

        Certificates for the Firm Shares and Additional Shares shall be in
definitive form and registered in such names and in such denominations as you
shall request in writing not later than 



                                       8
<PAGE>   10

one full business day prior to the Closing Date or the Option Closing Date, as
the case may be. The certificates evidencing the Firm Shares and Additional
Shares shall be delivered to you on the Closing Date or the Option Closing Date,
as the case may be, for the respective accounts of the several Underwriters,
with any transfer taxes payable in connection with the transfer of the Shares to
the Underwriters duly paid, against payment of the Purchase Price therefor.

        5. Conditions to the Underwriters' Obligations. The obligations of the
Company to sell the Shares to the Underwriters and the several obligations of
the Underwriters to purchase and pay for the Shares on the Closing Date are
subject to the condition that the Registration Statement shall have become
effective not later than 5:300 p.m. (New York City time) on the date hereof.

        The several obligations of the Underwriters are subject to the following
further conditions:

               (a) Subsequent to the execution and delivery of this Agreement
        and prior to the Closing Date, there shall not have occurred any change,
        or any development involving a prospective change, in the condition,
        financial or otherwise, or in the earnings, business or operations of
        the Company from that set forth in the Prospectus (exclusive of any
        amendments or supplements thereto subsequent to the date of this
        Agreement) that, in your judgment, is material and adverse and that
        makes it, in your judgment, impracticable to market the Shares on the
        terms and in the manner contemplated in the Prospectus.

               (b) The Underwriters shall have received on the Closing Date a
        certificate, dated the Closing Date and signed by an executive officer
        of the Company, to the effect that the representations and warranties of
        the Company contained in this Agreement are true and correct as of the
        Closing Date and that the Company has complied with all of the
        agreements and satisfied all of the conditions on its part to be
        performed or satisfied hereunder on or before the Closing Date. The
        officer signing and delivering such certificate may rely upon his or her
        knowledge as to proceedings threatened.

               (c) The Underwriters shall have received on the Closing Date an
        opinion of Wilson Sonsini Goodrich & Rosati, Professional Corporation,
        counsel for the Company, dated the Closing Date, to the effect that [TO
        BE REVISED, IF NECESSARY, UPON COMPLETION OF DUE DILIGENCE]:

                        (i) the Company has been duly incorporated, is validly
existing as a corporation in good standing under the laws of the jurisdiction of
its incorporation, has the corporate power and authority to own its property and
to conduct its business as described in the Prospectus and is duly qualified to
transact business and is in good standing in each jurisdiction in which the
conduct of its business or its ownership or leasing of property requires such
qualification, except to the extent that the failure to be so qualified or be in
good standing would not have a material adverse effect on the Company; and to
such counsel's knowledge, the Company has no subsidiary or subsidiaries and does
not control, directly or indirectly, any corporation, partnership, joint
venture, association or other business organization.



                                       9
<PAGE>   11

                        (ii) the authorized capital stock of the Company
conforms in all material respects as to legal matters to the description thereof
contained in the Prospectus;

                        (iii) the shares of Common Stock outstanding prior to
the issuance of the Shares have been duly authorized and are validly issued and
non-assessable, and to such counsel's knowledge, are fully paid;

                        (iv) the Shares have been duly authorized and, when
issued and delivered in accordance with the terms of this Agreement, will be
validly issued, fully paid and non-assessable, and the issuance of such Shares
will not be subject to any preemptive right pursuant to the Company's
certificate of incorporation or bylaws, or to such counsel's knowledge, similar
rights ;

                        (v) this Agreement has been duly authorized, executed
and delivered by the Company;

                        (vi) the execution and delivery by the Company of, and
the performance by the Company of its obligations under, this Agreement will not
contravene any provision of applicable law or the certificate of incorporation
or by-laws of the Company or, to such counsel's knowledge, any agreement or
other instrument binding upon the Company that is material to the Company or, to
such counsel's knowledge, any judgment, order or decree of any governmental
body, agency or court having jurisdiction over the Company that specifically
refers to or is binding on the Company, and no consent, approval, authorization
or order of, or qualification with, any governmental body or agency is required
for the performance by the Company of its obligations under this Agreement,
except such as may be required by the securities or Blue Sky laws of the various
states in connection with the offer and sale of the Shares by the Underwriters
or the rules and regulations of the NASD (as to which such counsel need not
express any opinion);

                        (vii) the statements (A) in the Prospectus under the
captions ," "Management," "Certain Transactions," "Description of Capital
Stock," and "Shares Eligible for Future Sale" and (B) in the Registration
Statement in Items 14 and 15, in each case insofar as such statements constitute
summaries of the legal matters, documents or proceedings referred to therein,
fairly present the information called for with respect to such legal matters,
documents and proceedings and fairly summarize the matters referred to therein;

                        (viii) such counsel does not know of any legal or
governmental proceedings pending or threatened to which the Company is a party
or to which any of the properties of the Company is subject that are required to
be described in the Registration Statement or the Prospectus and are not so
described or of any statutes, regulations, contracts or other documents that are
required to be described in the Registration Statement or the Prospectus or to
be filed as exhibits to the Registration Statement that are not described or
filed as required;

                        (ix) the Company is not and, after giving effect to the
offering and sale of the Shares and the application of the proceeds thereof as
described in the Prospectus, will not 



                                       10
<PAGE>   12

be an "investment company" as such term is defined in the Investment Company Act
of 1940, as amended; and

                        (x) such counsel (A) is of the opinion that the
Registration Statement and Prospectus (except for financial statements and
schedules and other financial and statistical data included therein as to which
such counsel need not express any opinion) comply as to form in all material
respects with the Securities Act and the applicable rules and regulations of the
Commission thereunder, (B) has no reason to believe that (except for financial
statements and schedules and other financial and statistical data as to which
such counsel need not express any belief) the Registration Statement and the
prospectus included therein at the time the Registration Statement became
effective contained any untrue statement of a material fact or omitted to state
a material fact required to be stated therein or necessary to make the
statements therein not misleading and (C) has no reason to believe that (except
for financial statements and schedules and other financial and statistical data
as to which such counsel need not express any belief) the Prospectus contains
any untrue statement of a material fact or omits to state a material fact
necessary in order to make the statements therein, in the light of the
circumstances under which they were made, not misleading.

                (d) The Underwriters shall have received on the Closing Date an
opinion of Gray Cary Ware & Freidenrich LLP, counsel for the Underwriters, dated
the Closing Date, (i) covering the matters referred to in Sections 5(c)(v),
5(c)(vi), 5(c)(viii) (but only as to the statements in the Prospectus under
"Description of Capital Stock" and "Underwriters") and 5(c)(x) above, and (ii)
to the effect that the statements in the Prospectus under the caption "Legal
Proceedings" as such statements constitute summaries of legal matters, documents
or proceedings referred to therein, fairly present the information called for
with respect to such legal matters, documents and proceedings and fairly
summarize the matters referred to therein.

        With respect to Section 5(c)(xiii) above, Wilson Sonsini Goodrich &
Rosati, Professional Corporation and Gray Cary Ware & Freidenrich LLP may state
that their opinion and belief are based upon their participation in the
preparation of the Registration Statement and Prospectus and any amendments or
supplements thereto and review and discussion of the contents thereof, but are
without independent check or verification, except as specified.

        The opinion of Wilson Sonsini Goodrich & Rosati, Professional
Corporation described in Section 5(c) above shall be rendered to the
Underwriters at the request of the Company and shall so state therein.

                (e) The Underwriters shall have received, on each of the date
hereof and the Closing Date, a letter dated the date hereof or the Closing Date,
as the case may be, in form and substance satisfactory to the Underwriters, from
Arthur Andersen LLP, independent public accountants, containing statements and
information of the type ordinarily included in accountants' "comfort letters" to
underwriters with respect to the financial statements and certain financial
information contained in the Registration Statement and the Prospectus; provided
that the letter delivered on the Closing Date shall use a "cut-off date" not
earlier than the date hereof.



                                       11
<PAGE>   13

                (f) The "lock-up" agreements, each substantially in the form of
Exhibit A hereto, between you and certain shareholders, officers and directors
of the Company relating to sales and certain other dispositions of shares of
Common Stock or certain other securities, delivered to you on or before the date
hereof, shall be in full force and effect on the Closing Date.

                (g) The Common Stock shall have received approval for listing
upon official notice of issuance on the Nasdaq National Market.

                (h) [ADDITIONAL CLOSING CONDITIONS TO BE ADDED, IF NECESSARY,
UPON COMPLETION OF DUE DILIGENCE.]

        The several obligations of the Underwriters to purchase Additional
Shares hereunder are subject to the delivery to you on the Option Closing Date
of such documents as you may reasonably request with respect to the good
standing of the Company, the due authorization and issuance of the Additional
Shares and other matters related to the issuance of the Additional Shares.

        6. Covenants of the Company. In further consideration of the agreements
of the Underwriters herein contained, the Company covenants with each
Underwriter as follows:

                (a) To furnish to you, without charge, four (4) signed copies of
the Registration Statement (including exhibits thereto) and for delivery to each
other Underwriter a conformed copy of the Registration Statement (without
exhibits thereto) and to furnish to you in New York City, without charge, prior
to 10:00 a.m. New York City time on the business day next succeeding the date of
this Agreement and during the period mentioned in Section 6(c) below, as many
copies of the Prospectus and any supplements and amendments thereto or to the
Registration Statement as you may reasonably request.

                (b) Before amending or supplementing the Registration Statement
or the Prospectus, to furnish to you a copy of each such proposed amendment or
supplement and not to file any such proposed amendment or supplement to which
you reasonably object, and to file with the Commission within the applicable
period specified in Rule 424(b) under the Securities Act any prospectus required
to be filed pursuant to such Rule.

                (c) If, during such period after the first date of the public
offering of the Shares as in the opinion of counsel for the Underwriters the
Prospectus is required by law to be delivered in connection with sales by an
Underwriter or dealer, any event shall occur or condition exist as a result of
which it is necessary to amend or supplement the Prospectus in order to make the
statements therein, in the light of the circumstances when the Prospectus is
delivered to a purchaser, not misleading, or if, in the reasonable opinion of
counsel for the Underwriters, it is necessary to amend or supplement the
Prospectus to comply with applicable law, forthwith to prepare, file with the
Commission and furnish, at its own expense, to the Underwriters and to the
dealers (whose names and addresses you will furnish to the Company) to which
Shares may have been sold by you on behalf of the Underwriters and to any other
dealers upon request, either amendments or supplements to the Prospectus so that
the statements in the Prospectus as so amended or supplemented will not, in the
light of the circumstances when the Prospectus is 



                                       12
<PAGE>   14

delivered to a purchaser, be misleading or so that the Prospectus, as amended or
supplemented, will comply with law.

                (d) To endeavor to qualify the Shares for offer and sale under
the securities or Blue Sky laws of such jurisdictions as you shall reasonably
request.

                (e) To make generally available to the Company's security
holders and to you as soon as practicable an earning statement covering the
twelve-month period ending ________, 2000 that satisfies the provisions of
Section 11(a) of the Securities Act and the rules and regulations of the
Commission thereunder.

                (f) Whether or not the transactions contemplated in this
Agreement are consummated or this Agreement is terminated, to pay or cause to be
paid all expenses incident to the performance of its obligations under this
Agreement, including: (i) the fees, disbursements and expenses of the Company's
counsel and the Company's accountants in connection with the registration and
delivery of the Shares under the Securities Act and all other fees or expenses
in connection with the preparation and filing of the Registration Statement, any
preliminary prospectus, the Prospectus and amendments and supplements to any of
the foregoing, including all printing costs associated therewith, and the
mailing and delivering of copies thereof to the Underwriters and dealers, in the
quantities hereinabove specified, (ii) all costs and expenses related to the
transfer and delivery of the Shares to the Underwriters, including any transfer
or other taxes payable thereon, (iii) the cost of printing or producing any Blue
Sky or Legal Investment memorandum in connection with the offer and sale of the
Shares under state securities laws and all expenses in connection with the
qualification of the Shares for offer and sale under state securities laws as
provided in Section 6(d) hereof, including filing fees and the reasonable fees
and disbursements of counsel for the Underwriters in connection with such
qualification and in connection with the Blue Sky or Legal Investment
memorandum, (iv) all filing fees and the reasonable fees and disbursements of
counsel to the Underwriters incurred in connection with the review and
qualification of the offering of the Shares by the National Association of
Securities Dealers, Inc., (v) all fees and expenses in connection with the
preparation and filing of the registration statement on Form 8-A relating to the
Common Stock and all costs and expenses incident to listing the Shares on the
Nasdaq National Market, (vi) the cost of printing certificates representing the
Shares, (vii) the costs and charges of any transfer agent, registrar or
depositary, (viii) the costs and expenses of the Company relating to investor
presentations on any "road show" undertaken in connection with the marketing of
the offering of the Shares, including, without limitation, expenses associated
with the production of road show slides and graphics, fees and expenses of any
consultants engaged in connection with the road show presentations with the
prior approval of the Company, travel and lodging expenses of the
representatives and officers of the Company and any such consultants, and
one-half the cost of any aircraft chartered or limousines hired in connection
with the road show, and (ix) all other costs and expenses incident to the
performance of the obligations of the Company hereunder for which provision is
not otherwise made in this Section. It is understood, however, that except as
provided in this Section, Section 7 entitled "Indemnity and Contribution", and
the last paragraph of Section 9 below, the Underwriters will pay all of their
costs and expenses, including fees and disbursements of their counsel, travel,
meals and lodging expenses of the representatives and officers of the
Underwriters, the costs of conference rooms and meals for "road show" meetings,



                                       13
<PAGE>   15

one-half the cost of any aircraft chartered or limousines hired in connection
with the "road show," stock transfer taxes payable on resale of any of the
Shares by them and any advertising expenses connected with any offers they may
make.

                (g) That in connection with the Directed Share Program, the
Company will ensure that the Directed Shares will be restricted to the extent
required by the National Association of Securities Dealers, Inc. (the "NASD") or
the NASD rules from sale, transfer, assignment, pledge or hypothecation for a
period of three (3) months following the date of the effectiveness of the
Registration Statement. Morgan Stanley will notify the Company as to which
Participants will need to be so restricted. The Company will direct the transfer
agent to place stop transfer restrictions upon such securities for such period
of time.

                (h) To pay all fees and disbursements of counsel incurred by the
Underwriters in connection with the Directed Share Program and stamp duties,
similar taxes or duties or other taxes, if any, incurred by the Underwriters in
connection with the Directed Share Program.

Furthermore, the Company covenants with Morgan Stanley that the Company will
comply with all applicable securities and other applicable laws, rules and
regulations in each foreign jurisdiction in which the Directed Shares are
offered in connection with the Directed Share Program.

        7. Indemnity and Contribution. (a) The Company agrees to indemnify and
hold harmless each Underwriter and each person, if any, who controls any
Underwriter within the meaning of either Section 15 of the Securities Act or
Section 20 of the Securities Exchange Act of 1934, as amended (the "EXCHANGE
ACT"), from and against any and all losses, claims, damages and liabilities
(including, without limitation, any legal or other expenses reasonably incurred
in connection with defending or investigating any such action or claim) caused
by any untrue statement or alleged untrue statement of a material fact contained
in the Registration Statement or any amendment thereof, any preliminary
prospectus or the Prospectus (as amended or supplemented if the Company shall
have furnished any amendments or supplements thereto), or caused by any omission
or alleged omission to state therein a material fact required to be stated
therein or necessary to make the statements therein not misleading, except
insofar as such losses, claims, damages or liabilities are caused by any such
untrue statement or omission or alleged untrue statement or omission based upon
information relating to any Underwriter furnished to the Company in writing by
such Underwriter through you expressly for use therein; and provided further
that the foregoing indemnity agreement with respect to any preliminary
prospectus shall not inure to the benefit of any Underwriter from whom the
person asserting any such losses, claims, damages or liabilities purchases
Shares, or any person controlling such Underwriter, if a copy of the Prospectus
(as then amended or supplemented if the Company shall have furnished any
amendments or supplements thereto) was not sent or given by or on behalf of such
Underwriter to such person, if required by law so to have been delivered, at or
prior to the written confirmation of the sale of the Shares to such person, and
if the Prospectus (as so amended or supplemented) would have cured the defect
giving rise to such losses, claims, damages or liabilities, unless such failure
is the result of cnoncompliance by the Company with Section 6(a) hereof.



                                       14
<PAGE>   16

                (b) Each Underwriter agrees, severally and not jointly, to
indemnify and hold harmless the Company, its directors, its officers who sign
the Registration Statement and each person, if any, who controls the Company
within the meaning of either Section 15 of the Securities Act or Section 20 of
the Exchange Act to the same extent as the foregoing indemnity from the Company
to such Underwriter, but only with reference to information relating to such
Underwriter furnished to the Company in writing by such Underwriter through you
expressly for use in the Registration Statement, any preliminary prospectus, the
Prospectus or any amendments or supplements thereto.

                (c) In case any proceeding (including any governmental
investigation) shall be instituted involving any person in respect of which
indemnity may be sought pursuant to Section 7(a) or 7(b), such person (the
"INDEMNIFIED PARTY") shall promptly notify the person against whom such
indemnity may be sought (the "INDEMNIFYING PARTY") in writing and the
indemnifying party, upon request of the indemnified party, shall retain counsel
reasonably satisfactory to the indemnified party to represent the indemnified
party and any others the indemnifying party may designate in such proceeding and
shall pay the fees and disbursements of such counsel related to such proceeding.
In any such proceeding, any indemnified party shall have the right to retain its
own counsel, but the fees and expenses of such counsel shall be at the expense
of such indemnified party unless (i) the indemnifying party and the indemnified
party shall have mutually agreed to the retention of such counsel or (ii) the
named parties to any such proceeding (including any impleaded parties) include
both the indemnifying party and the indemnified party and representation of both
parties by the same counsel would be inappropriate due to actual or potential
differing interests between them. It is understood that the indemnifying party
shall not, in respect of the legal expenses of any indemnified party in
connection with any proceeding or related proceedings in the same jurisdiction,
be liable for the fees and expenses of more than one separate firm (in addition
to any local counsel) for all such indemnified parties and that all such fees
and expenses shall be reimbursed as they are incurred. Such firm shall be
designated in writing by Morgan Stanley, in the case of parties indemnified
pursuant to Section 7(a), and by the Company, in the case of parties indemnified
pursuant to Section 7(b). The indemnifying party shall not be liable for any
settlement of any proceeding effected without its written consent, but if
settled with such consent or if there be a final judgment for the plaintiff, the
indemnifying party agrees to indemnify the indemnified party from and against
any loss or liability by reason of such settlement or judgment. Notwithstanding
the foregoing sentence, if at any time an indemnified party shall have requested
an indemnifying party to reimburse the indemnified party for fees and expenses
of counsel as contemplated by the second and third sentences of this paragraph,
the indemnifying party agrees that it shall be liable for any settlement of any
proceeding effected without its written consent if (i) such settlement is
entered into more than 30 days after receipt by such indemnifying party of the
aforesaid request and (ii) such indemnifying party shall not have reimbursed the
indemnified party in accordance with such request prior to the date of such
settlement. No indemnifying party shall, without the prior written consent of
the indemnified party, effect any settlement of any pending or threatened
proceeding in respect of which any indemnified party is or could have been a
party and indemnity could have been sought hereunder by such indemnified party,
unless such settlement includes an unconditional release of such indemnified
party from all liability on claims that are the subject matter of such
proceeding.



                                       15
<PAGE>   17

                (d) To the extent the indemnification provided for in Section
7(a) or 7(b) is unavailable to an indemnified party or insufficient in respect
of any losses, claims, damages or liabilities referred to therein, then each
indemnifying party under such paragraph, in lieu of indemnifying such
indemnified party thereunder, shall contribute to the amount paid or payable by
such indemnified party as a result of such losses, claims, damages or
liabilities (i) in such proportion as is appropriate to reflect the relative
benefits received by the Company on the one hand and the Underwriters on the
other hand from the offering of the Shares or (ii) if the allocation provided by
clause 7(d)(i) above is not permitted by applicable law, in such proportion as
is appropriate to reflect not only the relative benefits referred to in clause
7(d)(i) above but also the relative fault of the Company on the one hand and of
the Underwriters on the other hand in connection with the statements or
omissions that resulted in such losses, claims, damages or liabilities, as well
as any other relevant equitable considerations. The relative benefits received
by the Company on the one hand and the Underwriters on the other hand in
connection with the offering of the Shares shall be deemed to be in the same
respective proportions as the net proceeds from the offering of the Shares
(before deducting expenses) received by the Company and the total underwriting
discounts and commissions received by the Underwriters, in each case as set
forth in the table on the cover of the Prospectus, bear to the aggregate Public
Offering Price of the Shares. The relative fault of the Company on the one hand
and the Underwriters on the other hand shall be determined by reference to,
among other things, whether the untrue or alleged untrue statement of a material
fact or the omission or alleged omission to state a material fact relates to
information supplied by the Company or by the Underwriters and the parties'
relative intent, knowledge, access to information and opportunity to correct or
prevent such statement or omission. The Underwriters' respective obligations to
contribute pursuant to this Section 7 are several in proportion to the
respective number of Shares they have purchased hereunder, and not joint.

                (e) The Company and the Underwriters agree that it would not be
just or equitable if contribution pursuant to this Section 7 were determined by
pro rata allocation (even if the Underwriters were treated as one entity for
such purpose) or by any other method of allocation that does not take account of
the equitable considerations referred to in Section 7(d). The amount paid or
payable by an indemnified party as a result of the losses, claims, damages and
liabilities referred to in Section 7(d) shall be deemed to include, subject to
the limitations set forth above, any legal or other expenses reasonably incurred
by such indemnified party in connection with investigating or defending any such
action or claim. Notwithstanding the provisions of this Section 7, no
Underwriter shall be required to contribute any amount in excess of the amount
by which the total price at which the Shares underwritten by it and distributed
to the public were offered to the public exceeds the amount of any damages that
such Underwriter has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission. No person guilty of
fraudulent misrepresentation (within the meaning of Section 11(f) of the
Securities Act) shall be entitled to contribution from any person who was not
guilty of such fraudulent misrepresentation. The remedies provided for in this
Section 7 are not exclusive and shall not limit any rights or remedies which may
otherwise be available to any indemnified party at law or in equity.

                (f) The indemnity and contribution provisions contained in this
Section 7 and the representations, warranties and other statements of the
Company contained in this Agreement 



                                       16
<PAGE>   18

shall remain operative and in full force and effect regardless of (i) any
termination of this Agreement, (ii) any investigation made by or on behalf of
any Underwriter or any person controlling any Underwriter or by or on behalf of
the Company, its officers or directors or any person controlling the Company and
(iii) acceptance of and payment for any of the Shares.

        8. Direct Share Program Indemnification. (a) The Company agrees to
indemnify and hold harmless Morgan Stanely and each person, if any, who controls
Morgan Stanley within the meaning of either Section 15 of the Securities Act or
Section 20 of the Exchange Act ("Morgan Stanley Entities"), from and against any
and all losses, claims, damages and liabilities (including, without limitation,
any legal or other expenses reasonably incurred in connection with defending or
investigating any such action or claim) (i) caused by any untrue statement or
alleged untrue statement of a material fact contained in any material prepared
by the Company for distribution to Participants in connection with the Directed
Share Program or caused by any omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein, when considered in conjunction with the Prospectus or any applicable
preliminary prospectus, not misleading; (ii) caused by the failure of any
Participant to pay for and accept delivery of Directed Shares that, immediately
following the effectiveness of the Registration Statement, were subject to a
properly confirmed agreement to purchase; or (iii) related to, arising out of,
or in connection with the Directed Share Program, other than losses, claims,
damages or liabilities (or expenses relating thereto) that are finally
judicially determined to have resulted from the bad faith or gross negligence of
Morgan Stanley Entities.

                (b) In case any proceeding (including any governmental
investigation) shall be instituted involving any Morgan Stanley Entity in
respect of which indemnity may be sought pursuant to Section 8(a), the Morgan
Stanley Entity seeking indemnity, shall promptly notify the Company in writing
and the Company, upon request of the Morgan Stanley Entity, shall retain counsel
reasonably satisfactory to the Morgan Stanley Entity to represent the Morgan
Stanley Entity and any others the Company may designate in such proceeding and
shall pay the fees and disbursements of such counsel related to such proceeding.
In any such proceeding, any Morgan Stanley Entity shall have the right to retain
its own counsel, but the fees and expenses of such counsel shall be at the
expense of such Morgan Stanley Entity unless (i) the Company shall have agreed
to the retention of such counsel or (ii) the named parties to any such
proceeding (including any impleaded parties) include both the Company and the
Morgan Stanley Entity and representation of both parties by the same counsel
would be inappropriate due to actual or potential differing interests between
them. The Company shall not, in respect of the legal expenses of the Morgan
Stanley Entities in connection with any proceeding or related proceedings in the
same jurisdiction, be liable for the fees and expenses of more than one separate
firm (in addition to any local counsel) for all Morgan Stanley Entities. Any
such separate firm for the Morgan Stanley Entities shall be designated in
writing by Morgan Stanley. The Company shall not be liable for any settlement of
any proceeding effected without its written consent, but if settled with such
consent or if there be a final judgment for the plaintiff, the Company agrees to
indemnify the Morgan Stanley Entities from and against any loss or liability by
reason of such settlement or judgment. Notwithstanding the foregoing sentence,
if at any time a Morgan Stanley Entity shall have requested the Company to
reimburse it for fees and expenses of counsel as contemplated by the second and
third sentences of this paragraph, the Company 



                                       17
<PAGE>   19

agrees that it shall be liable for any settlement of any proceeding effected
without its written consent if (i) such settlement is entered into more than 30
days after receipt by the Company of the aforesaid request and (ii) the Company
shall not have reimbursed the Morgan Stanley Entity in accordance with such
request prior to the date of such settlement. The Company shall not, without the
prior written consent of Morgan Stanley, effect any settlement of any pending or
threatened proceeding in respect of which any Morgan Stanley Entity is or could
have been a party and indemnity could have been sought hereunder by such Morgan
Stanley Entity, unless such settlement includes an unconditional release of the
Morgan Stanley Entitites from all liability on claims that are the subject
matter of such proceeding.

                (c) To the extent the indemnification provided for in Section
8(a) is unavailable to a Morgan Stanley Entity or insufficient in respect of any
losses, claims, damages or liabilities referred to therein, then the Company in
lieu of indemnifying the Morgan Stanley Entity thereunder, shall contribute to
the amount paid or payable by the Morgan Stanley Entity as a result of such
losses, claims, damages or liabilities (i) in such proportion as is appropriate
to reflect the relative benefits received by the Company on the one hand and the
Morgan Stanley Entities on the other hand from the offering of the Directed
Shares or (ii) if the allocation provided by clause 8(c)(i) above is not
permitted by applicable law, in such proportion as is appropriate to reflect not
only the relative benefits referred to in clause 8(c)(i) above but also the
relative fault of the Company on the one hand and of the Morgan Stanley Entities
on the other hand in connection with any statements or omissions that resulted
in such losses, claims, damages or liabilities, as well as any other relevant
equitable considerations. The relative benefits received by the Company on the
one hand and the Morgan Stanley Entities on the other hand in connection with
the offering of the Directed Shares shall be deemed to be in the same respective
proportions as the net proceeds from the offering of the Directed Shares (before
deducting expenses) and the total underwriting discounts and commissions
received by the Morgan Stanley Entities for the Directed Shares, bear to the
aggregate Public Offering Price of the Directed Shares. If the loss, claim,
damage or liability is caused by an untrue or alleged untrue statement of a
material fact or the omission or alleged omission to state a material fact, the
relative fault of the Company on the one hand and the Morgan Stanley Entities on
the other hand shall be determined by reference to, among other things, whether
the untrue or alleged untrue statement or the omission or alleged omission
relates to information supplied by the Company or by the Morgan Stanley Entities
and the parties' relative intent, knowledge, access to information and
opportunity to correct or prevent such statement or omission.

                (d) The Company and the Morgan Stanley Entities agree that it
would not be just or equitable if contribution pursuant to this Section 8(d)
were determined by pro rata allocation (even if the Morgan Stanley Entities were
treated as one entity for such purpose) or by any other method of allocation
that does not take account of the equitable considerations referred to in
Section 8(c). The amount paid or payable by the Morgan Stanley Entities as a
result of the losses, claims, damages and liabilities referred to in the
immediately preceding paragraph shall be deemed to include, subject to the
limitations set forth above, any legal or other expenses reasonably incurred by
the Morgan Stanley Entities in connection with investigating or defending any
such action or claim. Notwithstanding the provisions of this Section 8, no
Morgan Stanley Entity shall be required to contribute any amount in excess of
the amount by which the total price at which the Shares distributed to the
public were offered to the public exceeds the amount of any 



                                       18
<PAGE>   20

damages that such Morgan Stanley Entity has otherwise been required to pay. The
remedies provided for in this Section 8 are not exclusive and shall not limit
any rights or remedies which may otherwise be available to any indemnified party
at law or in equity.

                (e) The indemnity and contribution provisions contained in this
Section 8 shall remain operative and in full force and effect regardless of (i)
any termination of this Agreement, (ii) any investigation made by or on behalf
of any Morgan Stanley Entity or the Company, its officers or directors or any
person controlling the Company and (iii) acceptance of and payment for any of
the Directed Shares.

        9. Termination. This Agreement shall be subject to termination by notice
given by you to the Company, if (a) after the execution and delivery of this
Agreement and prior to the Closing Date (i) trading generally shall have been
suspended or materially limited on or by, as the case may be, any of the New
York Stock Exchange, the American Stock Exchange, the National Association of
Securities Dealers, Inc., the Chicago Board of Options Exchange, the Chicago
Mercantile Exchange or the Chicago Board of Trade, (ii) trading of any
securities of the Company shall have been suspended on any exchange or in any
over-the-counter market, (iii) a general moratorium on commercial banking
activities in New York shall have been declared by either Federal or New York
State authorities or (iv) there shall have occurred any outbreak or escalation
of hostilities or any change in financial markets or any calamity or crisis
that, in your judgment, is material and adverse and (b) in the case of any of
the events specified in clauses 9(a)(i) through 9(a)(iv), such event, singly or
together with any other such event, makes it, in your judgment, impracticable to
market the Shares on the terms and in the manner contemplated in the Prospectus.

        10. Effectiveness; Defaulting Underwriters. This Agreement shall become
effective upon the execution and delivery hereof by the parties hereto.

        If, on the Closing Date or the Option Closing Date, as the case may be,
any one or more of the Underwriters shall fail or refuse to purchase Shares that
it has or they have agreed to purchase hereunder on such date, and the aggregate
number of Shares which such defaulting Underwriter or Underwriters agreed but
failed or refused to purchase is not more than one-tenth of the aggregate number
of the Shares to be purchased on such date, the other Underwriters shall be
obligated severally in the proportions that the number of Firm Shares set forth
opposite their respective names in Schedule I bears to the aggregate number of
Firm Shares set forth opposite the names of all such non-defaulting
Underwriters, or in such other proportions as you may specify, to purchase the
Shares which such defaulting Underwriter or Underwriters agreed but failed or
refused to purchase on such date; provided that in no event shall the number of
Shares that any Underwriter has agreed to purchase pursuant to this Agreement be
increased pursuant to this Section 9 by an amount in excess of one-ninth of such
number of Shares without the written consent of such Underwriter. If, on the
Closing Date, any Underwriter or Underwriters shall fail or refuse to purchase
Firm Shares and the aggregate number of Firm Shares with respect to which such
default occurs is more than one-tenth of the aggregate number of Firm Shares to
be purchased, and arrangements satisfactory to you and the Company for the
purchase of such Firm Shares are not made within 36 hours after such default,
this Agreement shall terminate without liability on the part of any
non-defaulting Underwriter or the Company. In any such case either 



                                       19
<PAGE>   21

you or the Company shall have the right to postpone the Closing Date, but in no
event for longer than seven days, in order that the required changes, if any, in
the Registration Statement and in the Prospectus or in any other documents or
arrangements may be effected. If, on the Option Closing Date, any Underwriter or
Underwriters shall fail or refuse to purchase Additional Shares and the
aggregate number of Additional Shares with respect to which such default occurs
is more than one-tenth of the aggregate number of Additional Shares to be
purchased, the non-defaulting Underwriters shall have the option to (i)
terminate their obligation hereunder to purchase Additional Shares or (ii)
purchase not less than the number of Additional Shares that such non-defaulting
Underwriters would have been obligated to purchase in the absence of such
default. Any action taken under this paragraph shall not relieve any defaulting
Underwriter from liability in respect of any default of such Underwriter under
this Agreement.

        If this Agreement shall be terminated by the Underwriters, or any of
them, because of any failure or refusal on the part of the Company to comply
with the terms or to fulfill any of the conditions of this Agreement, or if for
any reason the Company shall be unable to perform its obligations under this
Agreement, the Company will reimburse the Underwriters or such Underwriters as
have so terminated this Agreement with respect to themselves, severally, for all
out-of-pocket expenses (including the fees and disbursements of their counsel)
reasonably incurred by such Underwriters in connection with this Agreement or
the offering contemplated hereunder.

        11. Counterparts. This Agreement may be signed in two or more
counterparts, each of which shall be an original, with the same effect as if the
signatures thereto and hereto were upon the same instrument.

        12. Applicable Law. This Agreement shall be governed by and construed in
accordance with the internal laws of the State of New York.



                                       20
<PAGE>   22

        13. Headings. The headings of the sections of this Agreement have been
inserted for convenience of reference only and shall not be deemed a part of
this Agreement.


                                            Very truly yours,

                                            BROCADE COMMUNICATIONS SYSTEMS, INC.


                                            By:_________________________________
                                               Name:
                                               Title:




Accepted as of the date hereof

Morgan Stanley & Co. Incorporated
BT Alex. Brown Incorporated
Dain Rauscher Wessels, a division of
   Dain Rauscher Incorporated

Acting severally on behalf of themselves and the several Underwriters named in
  Schedule I hereto.

By: Morgan Stanley & Co. Incorporated



        By:__________________________
           Name:
           Title:



                                       21
<PAGE>   23

                                   SCHEDULE I





                                                          NUMBER OF
                                                          FIRM SHARES
           UNDERWRITER                                    TO BE PURCHASED

Morgan Stanley & Co. Incorporated
BT Alex. Brown Incorporated
Dain Rauscher Wessels, a division of
   Dain Rauscher Incorporated


[NAMES OF OTHER UNDERWRITERS]












                                                                 ---------------

                                    Total ........
                                                                 ===============



<PAGE>   24

                                    EXHIBIT A


                            [FORM OF LOCK-UP LETTER]



                                                             _____________, 1999


Morgan Stanley & Co. Incorporated
BT Alex. Brown Incorporated
Dain Rauscher Wessels, a division of
   Dain Rauscher Incorporated
c/o Morgan Stanley & Co. Incorporated
    1585 Broadway
    New York, NY  10036

Dear Sirs and Mesdames:

        The undersigned understands that Morgan Stanley & Co. Incorporated
("MORGAN STANLEY") proposes to enter into an Underwriting Agreement (the
"UNDERWRITING AGREEMENT") with Brocade Communications Systems, Inc., a Delaware
corporation (the "COMPANY"), providing for the public offering (the "PUBLIC
OFFERING") by the several Underwriters, including Morgan Stanley (the
"UNDERWRITERS"), shares (the "SHARES") of the Common Stock, par value $0.____
per share, of the Company (the "COMMON STOCK").

        To induce the Underwriters that may participate in the Public Offering
to continue their efforts in connection with the Public Offering, the
undersigned hereby agrees that, without the prior written consent of Morgan
Stanley on behalf of the Underwriters, it will not, during the period commencing
on the date hereof and ending 180 days after the date of the final prospectus
relating to the Public Offering (the "PROSPECTUS"), (1) offer, pledge, sell,
contract to sell, sell any option or contract to purchase, purchase any option
or contract to sell, grant any option, right or warrant to purchase, lend, or
otherwise transfer or dispose of, directly or indirectly, any shares of Common
Stock or any securities convertible into or exercisable or exchangeable for
Common Stock or (2) enter into any swap or other arrangement that transfers to
another, in whole or in part, any of the economic consequences of ownership of
the Common Stock, whether any such transaction described in clause (1) or (2)
above is to be settled by delivery of Common Stock or such other securities, in
cash or otherwise. The foregoing sentence shall not apply to (a) the sale of any
Shares to the Underwriters pursuant to the Underwriting Agreement or (b)
transactions relating to shares of Common Stock or other securities acquired in
open market transactions after the completion of the Public Offering. In
addition, the undersigned agrees that, without the prior written consent of
Morgan Stanley on behalf of the Underwriters, it will not, during the period
commencing on the date hereof and ending 180 days after the date of the
Prospectus, make any 



<PAGE>   25

demand for or exercise any right with respect to, the registration of any shares
of Common Stock or any security convertible into or exercisable or exchangeable
for Common Stock.

        Whether or not the Public Offering actually occurs depends on a number
of factors, including market conditions. Any Public Offering will only be made
pursuant to an Underwriting Agreement, the terms of which are subject to
negotiation between the Company and the Underwriters.


                                            Very truly yours,


                                            ____________________________________
                                            (Name)

                                            ____________________________________
                                            (Address)



                                       2

<PAGE>   1

                                                                     EXHIBIT 5.1

                                  May 4, 1999

Brocade Communications Systems, Inc.
1901 Guadalupe Parkway
San Jose, CA 95131

     RE:  REGISTRATION STATEMENT ON FORM S-1
          ----------------------------------

Ladies and Gentlemen:

     We have examined the Registration Statement on Form S-1, as amended, filed
by Brocade Communications Systems, Inc., a Delaware Corporation (the "Company"),
with the Securities and Exchange Commission in connection with the registration
under the Securities Act of 1933, as amended, of up to 3,737,500 shares of the
Company's Common Stock (including an over-allotment of up to 487,500 shares of
the Company's Common Stock granted to the underwriters) (the "Shares"). The
Shares are to be sold to the underwriters for resale to the public as described
in the Registration Statement and pursuant to the Underwriting Agreement filed
as an exhibit thereto. As legal counsel to the Company, we have examined the
proceedings proposed to be taken in connection with said sale and issuance of
the Shares.

     Based upon the foregoing, we are of the opinion that the Shares, when
issued in the manner described in the Registration Statement, will be duly
authorized, validly issued, fully paid and nonassessable.

     We consent to the use of this opinion as an exhibit to the Registration
Statement, and further consent to the use of our name wherever appearing in the
Registration Statement, including the Prospectus constituting a part thereof,
and any amendment thereto.

                                   Very truly yours,

                                   /s/ WILSON SONSINI GOODRICH & ROSATI, P.C.
                                   ------------------------------------------
                                   WILSON SONSINI GOODRICH & ROSATI
                                   Professional Corporation


<PAGE>   1
                                                                   EXHIBIT 10.18

                                ACKNOWLEDGEMENT

     This Acknowledgement is made on April 22, 1999 by Brocade Communications 
Systems, Inc., a California corporation with offices at 1901 Guadalupe Parkway, 
San Jose, CA 95131 ("BROCADE") and Wind River Systems, Inc., a Delaware 
corporation with offices at 5201 Great America Parkway, Suite 320, Santa Clara, 
California 95054 ("WIND RIVER").

The parties hereby acknowledge that on or about October 11, 1995, the parties 
agreed into the following agreements:

     A.  The Wind River Systems, Inc. VxWorks Target Application License
         Agreement attached as Exhibit A and the related Purchase Order attached
         as EXHIBIT B, (referenced in such agreement as the Sales
         Acknowledgement Agreement) which gave Brocade certain rights to
         distribute copies of portions of the VxWorks Development Software and
         to incorporate such copies physically in target applications developed
         by Brocade using VxWorks. The parties acknowledge that under such
         agreements, Brocade may distribute an unlimited number of copies of the
         VxWorks Target Application provided Brocade pays Wind River a per unit
         royalty.

     B.  The end user license agreement attached as EXHIBIT C, which allows
         Brocade to use certain development tools referenced in such purchase
         order, i.e. the VxWorks Development Systems, BSP Part Kit, and WindNet
         SNMP.

ACKNOWLEDGED:

Brocade Communications Systems, Inc.      Wind River Systems, Inc.


By:      /s/ VICTOR RINKLE                 By:    /s/ WENDY OKUN
   ------------------------------             -----------------------------

Name:      Victor Rinkle                   Name:      Wendy Okun
     ----------------------------             -----------------------------

Title:    V.P. OPERATIONS                  Title: CORPORATE COUNSEL
      ---------------------------                --------------------------



                                       3
<PAGE>   2
                                   EXHIBIT A


                            WIND RIVER SYSTEMS, INC.
                  VXWORKS TARGET APPLICATION LICENSE AGREEMENT
                                   ____ PACK


     PLEASE READ THIS DOCUMENT CAREFULLY BEFORE OPENING THIS PACKAGE.

     THIS AGREEMENT STATES THE TERMS AND CONDITIONS UPON WHICH WIND RIVER
SYSTEMS, INC. ("WIND RIVER") OFFERS TO LICENSE TO YOU THE RIGHT TO MAKE A
LIMITED NUMBER OF COPIES OF CERTAIN PORTIONS OF THE VXWORKS DEVELOPMENT SOFTWARE
AND TO INCORPORATE SUCH COPIES PHYSICALLY IN TARGET APPLICATIONS DEVELOPED BY
YOU USING VXWORKS (THE TARGET APPLICATIONS). AMONG OTHER THINGS, THIS AGREEMENT
CONTAINS WARRANTY DISCLAIMERS. BY OPENING THIS PACKAGE YOU ARE AGREEING TO
BECOME BOUND BY THE TERMS OF THIS AGREEMENT.

     IF YOU DO NOT AGREE TO THE TERMS OF THIS AGREEMENT, DO NOT OPEN THE 
PACKAGE. PROMPTLY RETURN THE UNOPENED PACKAGE TO THE PLACE WHERE YOU OBTAINED 
IT FOR A FULL REFUND.

     THIS AGREEMENT APPLIES TO ALL FILES PROVIDED WITH THE VXWORKS DEVELOPMENT 
ENVIRONMENT EXCEPT THE VXWORKS DIRECTORY "bin", SUBDIRECTORY "h", AND THE FILES 
ENTITLED "makefile" IN DIRECTORIES "config/all" AND "config/(target)" (THE 
"LICENSED FILES"). NO LICENSE IS GRANTED TO ANY OTHER WIND RIVER SOFTWARE UNDER 
THIS AGREEMENT, INCLUDING BUT NOT LIMITED TO ANY OTHER PORTION OF VXWORKS.

The Licensed Files are licensed, not sold, to you for use only under the terms 
of this Agreement, and Wind River reserves all rights not expressly granted to 
you.

1.  LICENSE. You (the original licensee) may:

(a) Subject to all of the limitations set forth herein and on the Wind River 
Acknowledgment Agreement to which this Target Application License Agreement 
applies (the Sales agreement), make only up to the number of copies set forth 
above (i.e., the 50 Pack license allows you to make up to 50 copies) of the 
Licensed Files in tangible object code form only for physical incorporation 
into Target Applications. Each such Licensed File shall be accessible only as 
part of a Target Application and not on a stand alone or independent basis. In 
no event will Target Applications contain software development functionality. 
You agree to affix to each tangible copy of a Target Application containing any 
portion of the Licensed Files one of the serially numbered and adhesive labels 
contained in this package. In addition, you shall reproduce Wind River's 
VxWorks copyright notices as contained in the original in each such copy and in 
human-readable form in all copy media.

(b) Distribute the Target Applications incorporating copies of the Licensed
Files made under (a) above throughout the world; provided, however, that each
such copy shall be licensed to the end user under the terms of an end user
license that (i) does not allow further copying of the Licensed Files (except
for backup purposes with retention of Wind River copyright notices), (ii)
expressly disclaims all warranties as to the Licensed Files, (iii) requires the
end user to take precautions that are reasonable under the circumstances to
maintain the confidentiality of the Licensed Files, and (iv) for any licenses to
any United States government agency, provides that the agency is subject to
restrictions substantially similar to those set forth in Section 10 below.

2.  RESTRICTIONS. You may only make copies of the Licensed Files only at the
Location (as defined on the Sales Agreement) for use in connection with the
Project (as defined on the Sales Agreement). Unauthorized copying of the
Licensed Files is expressly forbidden. You may be held legally responsible for
any copyright infringement which is caused or encouraged by your failure to
abide by the terms of this Agreement. You may not decompile, reverse engineer,
disassemble or otherwise reduce the Licensed Files in a human perceivable form
or, except as set forth above, disclose them to any third party. You understand


WRS STANDARD TARGET DISTRIBUTION LICENSE
Revision 1.0
January 14, 1998
Page 1 of 3
  



<PAGE>   3
that Wind River may update or revise the Licensed Files and in so doing incurs
no obligation to furnish such updates to you, other than under a valid VxWorks
Maintenance Agreement. You agree to keep records of all copies of the Licensed
Files or any portion thereof made by you. Wind River shall have the right, upon
reasonable notice, to have independent auditors examine your records regarding
such practices. EXCEPT AS SET FORTH ABOVE, UPON TRANSFER OF ANY COPY,
MODIFICATION OR MERGED PORTION OF THE LICENSED FILES TO ANOTHER PARTY, THIS
LICENSE IS AUTOMATICALLY TERMINATED.

3. CONFIDENTIALITY. Wind River considers the Licensed Files to contain valuable 
trade secrets of Wind River, the unauthorized disclosure of which could cause 
irreparable harm to Wind River. Except as expressly set forth above, you agree 
to use reasonable efforts not to disclose the Licensed Files to any third 
parties and not to use the Licensed Files other than for the purposes 
authorized by this Agreement. This confidentiality obligation shall continue 
after any termination of this Agreement.

4. WARRANTY DISCLAIMER. THE LICENSED FILES, WHEN INCORPORATED INTO A TARGET 
APPLICATION, ARE PROVIDED "AS IS" AND WITHOUT WARRANTY OF ANY KIND. WIND RIVER 
DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES 
OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF 
THIRD PARTY RIGHTS.
NO ORAL OR WRITTEN INFORMATION OR ADVICE GIVEN BY WIND RIVER, ITS DEALERS, 
DISTRIBUTORS, AGENTS OR EMPLOYEES SHALL CREATE A WARRANTY OR IN ANY WAY 
INCREASE THE SCOPE OF THIS WARRANTY AND YOU MAY NOT RELY ON ANY SUCH 
INFORMATION OR ADVICE.

5. LIMITED REMEDIES. WIND RIVER SHALL NOT BE LIABLE FOR ANY INCIDENTAL OR 
CONSEQUENTIAL DAMAGES (INCLUDING DAMAGES FOR LOSS OF BUSINESS, PROFITS OR THE 
LIKE) ARISING OUT OF THE USE OR INABILITY TO USE THE LICENSED FILES EVEN IF 
WIND RIVER OR ITS REPRESENTATIVES HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH 
DAMAGES. THE LIABILITY OF WIND RIVER FOR ANY CLAIMS ARISING OUT OF THIS 
AGREEMENT, THE SALES AGREEMENT OR USE OF THE PROGRAM, REGARDLESS OF THE FORM OF 
ACTION, SHALL NOT EXCEED THE GREATER OF THE LICENSE FEE FOR THE PROGRAM OR 
$500. THE LIMITED WARRANTY, LIMITED REMEDIES AND LIMITED LIABILITY ARE 
FUNDAMENTAL ELEMENTS OF THE BASIS OF THE BARGAIN BETWEEN WIND RIVER AND YOU. 
WIND RIVER WOULD NOT BE ABLE TO PROVIDE THE LICENSED FILES WITHOUT SUCH 
LIMITATIONS.

6. INDEMNITY. You agree to indemnify, defend and hold Wind River harmless from 
any claim, lawsuit, legal proceeding, settlement or judgment (including without 
limitation Wind River's reasonable United States and local attorneys' and 
expert witnesses' fees and costs) arising out of or in connection with the 
copying, marketing, performance or other distribution of the Target 
Applications.

7. SUPPORT AND MAINTENANCE. Except as may be provided in a separate agreement 
between Wind River and you, if any, Wind River is under no obligation to 
maintain or support the copies of the Licensed Files made and distributed 
hereunder and Wind River has no obligation to furnish you with any further 
assistance, documentation or information of any nature or kind. You are solely 
responsible for the support and maintenance of all portions of any Target 
Applications you develop.

8. TERMINATION. This Agreement is effective until terminated. Except for 
Sections 2 through 6 (which will survive any termination of this Agreement), 
this Agreement will continue until your breach of this Agreement. Upon 
termination, you agree not to use the Licensed Files for any purpose whatsoever 
and to destroy any copy of the Licensed Files then in your possession. This 
remedy shall be in addition to any other remedies available to Wind River. Any 
valid licenses to Target Applications incorporating Licensed Files granted by 
you under this Agreement shall survive the termination of this Agreement.


WRS STANDARD TARGET DISTRIBUTION LICENSE
Revision 1.0
January 14, 1998
Page 2 of 3


<PAGE>   4
9.  EXPORT CONTROL. You may not export or reexport the Licensed Files or the 
immediate product produced by use of the VxWorks program (including TARGET 
APPLICATIONS), without complying with all United States export laws and 
regulations, including but not limited to (i) obtaining prior authorization from
the U.S. Department of Commerce if a validated export license is required, and 
(ii) obtaining written assurances from licensees, if required.

10. GOVERNMENT CUSTOMERS.  If the rights granted hereunder are acquired by or 
on behalf of a unit or agency of the United States Government, this provision 
applies. the VxWorks Program (the Program): (a) was developed at private 
expense, is existing computer software and no part of it was developed with 
government funds, (b) is a trade secret of Wind River for all purposes of the 
Freedom of Information act, (c) is "restricted computer software" submitted 
with restricted rights in accordance with subparagraphs (a) through (d) of the 
Commercial Computer Software-Restricted Rights clause at 52.227-19 and its 
successors, (d) in all respects is proprietary data belonging solely to Wind 
River, (e) is unpublished and all rights are reserved under the copyright laws 
of the United States. For units of the Department of Defense (DoD), the Program 
is licensed only with "Restricted Rights" as that term is defined in the DoD 
Supplement to the Federal Acquisition Regulation, 252.227-7013(c)(1)(ii), 
Rights in Technical Data and Computer Software and its successors, and use, 
duplication or disclosure is subject to restrictions as set forth in 
subdivision (c)(1)(ii) of the Rights in Technical Data and Computer Software 
clause at 252.227-7013. Contractor/manufacturer is Wind River Systems, Inc. 
1010 Atlantic Avenue, Alameda, CA 94501. If the Program is acquired under a 
GSA Schedule, the Government has agreed to refrain from changing or removing 
any insignia or lettering from the Program or the documentation that is 
provided or from producing copies of manuals or media (except for backup 
purposes).

11.  GENERAL. This Agreement will be governed by the laws of the State of 
California except with regard to its choice of law rules. This Agreement and 
the Sales Agreement between Wind River and you constitute the complete, final 
and exclusive statement of the agreement between Wind River and you, which 
supersede all proposals, oral or written, and all other communications between 
the parties relating to the subject matter of this Agreement. No waiver, 
alteration or modification of the provisions of this Agreement or any of the 
terms of your purchase order will be valid unless made in writing and signed by 
a corporate officer of Wind River. If any legal action or proceeding is brought 
for the enforcement of this Agreement, or because of any alleged dispute, 
breach, default or misrepresentation in connection with any of the provisions 
of this Agreement, the successful or prevailing party or parties shall be 
entitled to recover reasonable attorneys' fees and other costs incurred in that 
action or proceeding, in addition to any other relief to which such party may 
be entitled. If any provision or provisions of this Agreement are determined to 
be invalid, illegal or unenforceable, the validity, legality and enforceability 
of the remaining provisions of this Agreement will not in any way be affected 
or impaired thereby.

     Should you have any questions concerning this Agreement, or if you wish to 
contact Wind River for any reason, please write: Corporate Counsel, Wind River 
Systems, 1010 Atlantic Avenue, Alameda, CA 94501.



WRS STANDARD TARGET DISTRIBUTION LICENSE
Revision 1.0
January 14, 1998
Page 3 of 3


<PAGE>   5
                                   EXHIBIT B



BROCADE COMMUNICATIONS                                            PURCHASE ORDER
457 E. EVELYN AVE. SUITE E
SUNNYVALE, CA 94086                                      DATE        P.O. NUMBER
                                                       --------      -----------
                                                       10/11/95           16



VENDOR                                         SHIP TO
- ---------------------------------              ---------------------------------
Wind River Systems, Inc.                       Brocade Communications
5201 Great America Pkwy.                       457 Evelyn Ave. Suite E
Suite 320                                      Sunnyvale, CA 94086
Santa Clara, CA 95054


                                                       EXPECTED          FOB
                                                      ----------     -----------
                                                       10/11/95      Alameda, CA


<TABLE>
<CAPTION>
        ITEM                        DESCRIPTION                               QTY        RATE            AMOUNT
- -----------------------------------------------------------------------------------------------------------------
<S>                 <C>                                                       <C>      <C>              <C>
VxWorks             VxWorks/Tornado Development System for                     1       16,500.00        16,500.00
                    SPARCitation Host/060 Target
                    Includes BSP for Cyclone CVME-960 Boxed
VxWorks Maint       VxWorks Annual Maintenance and Support                     1        2,800.00         2,800.00
VXWorks Addt        *Additional Seats of VxWorks Tornado Development           2            0.00             0.00
                    System for SPARCitation Host/960 Target ($2750.00
                    ea.)
Maint Addt          *VxWorks Annual Maintenance and Support for                2            0.00             0.00
                    Additional Seats ($470.00 each)
BSP Port kit        BSP Port Kit, Value Option for SPARCitation Host           1        2,000.00         2,000.00
BSP Maint           BSP Port Kit Annual Maintenance and Support                1          340.00           340.00
WindNet SNMP        WindNet SNMP Developers License for                        1        4,000.00         4,000.00
                    SPARCitation Host/960 Target
                    Includes: MIB Compiler for SPARCitation Host
WindNet Maint       WindNet SNMP Annual Maintenance and Support                1          680.00           680.00

                    *WindRiver Systems will loan the additional two units of
                    VxWorks/Tornado to Brocade Communications for a period
                    of 12 months at no charge. WindRiver Systems will then
                    invoice Brocade Communications for $6440.00 for the
                    additional two development units on October 1, 1996.

                    VxWorks Target License Pricing:

                    Cumulative Qty          Price per Target License
                    1-100                      [*]
                    101-500                    [*]
                    501-1,000                  [*]
                    1,001-2,500                [*]
                    2,501-5,000                [*]
                    5,001-10,000               [*]
                    10,001+                    [*]
</TABLE>

- --------------------------------------------------------------------------------

Terms: Net 30  Authorized Signature:                                  TOTAL

- --------------------------------------------------------------------------------

* Certain information on this page has been omitted and filed separately with
  the Commission. Confidential treatment has been requested with respect to
  the omitted portions.

                                     Page 1
<PAGE>   6

BROCADE COMMUNICATIONS                                            PURCHASE ORDER
457 E. EVELYN AVE. SUITE E                                 ---------------------
SUNNYVALE, CA 84086                                           DATE   P.O. NUMBER
                                                           ---------------------
                                                            10/1/95       16
                                                           ---------------------

- ----------------------------------          ------------------------------------
VENDOR                                      SHIP TO
- ----------------------------------          ------------------------------------
WIND RIVER SYSTEMS, INC.                    BROCADE COMMUNICATIONS
5201 GREAT AMERICA PKWY.                    427 E. EVELYN AVE. SUITE E
SUITE 320                                   SUNNYVALE, CA 94086
SANTA CLARA, CA 95054
                                                     
                                                        ------------------------
                                                           EXPECTED       FOB
                                                        ------------------------
                                                          10/11/95   ALAMEDA, CA
- --------------------------------------------------------------------------------
     ITEM                DESCRIPTION               QTY     RATE         AMOUNT
- --------------------------------------------------------------------------------
               This pricing reflects two special 
               terms, cumulative discounts and
               payments on a quarterly basis. The
               quantities are cumulative for all
               products covered by the Project. 
               All payments will be made thirty 
               days after the end of the calendar 
               quarter for units shipped in that
               quarter.

               For quote #101195-JR-BC-2







- --------------------------------------------------------------------------------
TERMS: NET 30 AUTHORIZED SIGNATURE
            [SIGNATURE ILLEGIBLE]                        TOTAL     $26,330.00
- --------------------------------------------------------------------------------
       [SIGNATURE ILLEGIBLE]         Page 2
<PAGE>   7

                                   EXHIBIT C

BY OPENING THIS PACKAGE YOU ARE AGREEING TO BE BOUND BY THE TERMS OF THIS 
AGREEMENT. DO NOT OPEN THIS PACKAGE UNTIL YOU HAVE CAREFULLY READ AND AGREED TO 
THE FOLLOWING TERMS AND CONDITIONS. IF YOU DO NOT AGREE TO THE TERMS OF THIS 
AGREEMENT, PROMPTLY RETURN THE SOFTWARE AND ACCOMPANYING DOCUMENTATION AND THE 
PRICE YOU PAID FOR THE SOFTWARE WILL BE REFUNDED.

LICENSE AND RESTRICTIONS: Wind River Systems ("WRS") grants you the
non-exclusive, non-transferable right to use the software program on this
CD-ROM, including any documentation in hard or soft copy (collectively, the
"Software"), only: 1) for the number of users; 2) at the street address; 3) on
the type of computer; and for the particular project, which are specified in the
purchase order which you submitted to WRS to purchase this license. You must
purchase additional licenses for additional users, for other addresses, for a
different type of computer, or for other projects. You will not use, copy,
modify, rent, lease, loan, sell, transfer, market, distribute, or electronically
transfer the Software from one computer to another over a network except as
provided in this Agreement. Unauthorized copying of the software and
accompanying documentation is expressly forbidden. You may not use the Software
from multiple locations of a multi-user or networked system at any time. The 
Software contains trade secrets of WRS and in order to protect them, you may 
not decompile, reverse engineer, disassemble or otherwise reproduce the 
Software to a human perceivable form or disclose them to a third party.

WARRANTY: WRS warrants that the media on which Software is delivered will be 
free from defects in materials or workmanship for a period of ninety (90) days 
from the date on which you receive such media. If during the foregoing ninety 
(90) day warranty period the media on which Software is delivered proves to be 
defective, WRS will repair or replace such media, at WRS' option, and as your 
sole remedy for any breach of warranty hereunder. THE FOREGOING WARRANTY IS IN 
LIEU OF ALL OTHER WARRANTIES, EXPRESS AND IMPLIED. WRS EXPRESSLY DISCLAIMS ALL 
IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR 
NONINFRINGEMENT OF THIRD PARTY RIGHTS.

LIMITATION OF LIABILITY: WRS WILL NOT BE LIABLE FOR ANY LOSS OF PROFITS, LOSS 
OF USE, INTERRUPTION OF BUSINESS, NOR FOR INDIRECT, SPECIAL, INCIDENTAL, OR 
CONSEQUENTIAL DAMAGES OF ANY KIND, WHETHER UNDER THIS AGREEMENT OR OTHERWISE,
IRRESPECTIVE OF WHETHER WRS HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH 
DAMAGES. IN NO EVENT SHALL WRS' LIABILITY HEREUNDER EXCEED THE AMOUNT YOU PAID 
FOR THE SOFTWARE.

TERMINATION: WRS may terminate this license at any time if you are in breach of 
any of its terms and conditions. Upon termination, you will immediately destroy 
the Software and will certify in writing to WRS that you have done so.

U.S. GOVERNMENT RESTRICTED RIGHTS: The Software and its documentation are 
provided with restricted rights. Use, duplication, or disclosure is subject to 
restrictions set forth in subparagraph (c)(1)(ii) of The Rights in Technical 
Data and Computer Software clause at DFARS 252.227-7013 or subparagraphs (c)(1) 
and (2) of the Commercial Computer Software - Restricted Rights at 48 CFR 
52-227-19, as applicable. The Contractor/Manufacturer is Wind River Systems, 
Inc., 1010 Atlantic Avenue, Alameda, California 94501.

EXPORT CONTROL: You agree that your performance under this Agreement shall at 
all times conform to the requirements of all applicable laws, regulations, 
rules and the like, including those relating to the export of technology, 
including software and related documentation. To the extent required, you will 
obtain all applicable export licenses prior to any such export of the Software.

APPLICABLE LAW/GENERAL: This Agreement is governed solely by the laws of the 
state of California and the United States, including patent and copyright laws. 
This Agreement shall not be subject to the United Nations Convention on 
Contracts for the International Sale of Goods. Sole jurisdiction over any 
dispute arising under this agreement shall be brought in the courts of the 
United States of America, with sole venue in Alameda County, California. This 
Agreement is the entire agreement between the parties regarding this subject 
matter, and supersedes all prior discussions, negotiations, agreements and the 
like. This Agreement may be modified only in writing, and signed by both 
parties. Purchase orders submitted by you to WRS shall be for administrative 
convenience only, and any printed terms therein shall have no effect unless 
otherwise agreed in writing by WRS.






<PAGE>   1
                                                                   EXHIBIT 10.20

                      BROCADE COMMUNICATIONS SYSTEMS, INC.
                             1901 Guadalupe Parkway
                               San Jose, CA 95131
                                 (408) 487-8000


                                 April 5, 1999





Mr. Michael J. Byrd
14858 Gypsy Hill Road
Saratoga, CA 95070

Dear Mike:

     Brocade Communications Systems, Inc. (the "Company") is pleased to offer
you employment on the following terms:

1. POSITION. You will serve in a full-time capacity as Vice President and Chief
Financial Officer of the Company. You will report to the Company's Chief
Executive Officer.

2. SALARY AND BONUS. You will be paid a salary at the initial annual rate of
$200,000, payable in semi-monthly installments in accordance with the Company's
standard payroll practices for salaried employees. This salary will be subject
to adjustment pursuant to the Company's employee compensation policies in effect
from time to time. You will also be eligible for an annual bonus of up to 30% of
your annual salary (pro-rated for the fiscal year ending October 31, 1999) upon
achievement of mutually agreed upon milestones A third of each year's bonus will
be paid quarterly, commencing with the fiscal quarter ending July 31, 1999. The
balance will be paid at the end of the Company's fiscal year.

3. INITIAL STOCK OPTION GRANT. You will be granted an initial option to purchase
330,000 shares of the Company's Common Stock. Except as otherwise provided in
this letter, the option will be subject to the terms and conditions applicable
to options granted under the Company's 1998 Equity Incentive Plan (the "Plan"),
as described in the Plan and the applicable stock option agreement and stock
repurchase agreement. The exercise price will be equal to $5.00 per share. The
term of the option will be 10 years, except that the option will expire (if
earlier) on the date 3 months after your service terminates for any reason
except for your death or permanent and total disability ("Disability"), in which
case the option will expire one year from the date of your termination. The
option will be immediately exercisable, but the purchased shares will be subject
to repurchase by the Company at the exercise price in the event that your
service terminates before you vest in the shares. You will vest in the option
shares in equal monthly installments over the first 48 months of service, as
described in the applicable stock option 

<PAGE>   2

agreement and stock repurchase agreement. In addition, your option shares will
vest on an accelerated basis under the following circumstances:

               (a) All of your option shares will vest if your service with the
        Company terminates because of your death or your permanent and total
        disability. For this purpose, you will be considered totally and
        permanently disabled if (i) you fail to perform your duties for at least
        90 consecutive days due to physical or mental injury, disability or
        illness (other than pursuant to a "pre-existing condition" you have on
        April 2, 1999, as such term is defined in the Health Insurance
        Portability and Accountability Act of 1996), and (ii) you are determined
        to be totally and permanently disabled by a qualified independent
        physician expert in the area of the disability or illness selected in
        good faith by the Chief Executive Officer.

               (b) If the Company discharges you without Cause (as defined
        below), you will receive three year's vesting acceleration (if such
        termination occurs before April 2, 2000) or one two year's vesting
        acceleration (if such termination occurs on or after April 2, 2000 and
        prior to April 2, 2001).

               (c) One-half of your remaining unvested option shares will vest
        if the Company is subject to a Change in Control before your service
        with the Company terminates. Thereafter, the same number of option
        shares will vest each month as before the Change in Control, except as
        otherwise provided in this letter. For the purposes of this agreement, a
        "Change of Control" shall mean the closing of (i) a consolidation or
        merger of the Company with or into any other corporation or corporations
        in which the holders of the Company's outstanding shares immediately
        before such consolidation or merger do not, immediately after such
        consolidation or merger, retain stock representing a majority of the
        voting power of the surviving corporation of such consolidation or
        merger, or (ii) a sale of all or substantially all of the assets of the
        Company.

               (d) All of your option shares will vest if, within one year after
        a Change in Control, you are subject to a Constructive Termination (as
        defined below).

You may pay the exercise price of shares of the Company's Common Stock acquired
under the option with a full-recourse promissory note secured by the shares. The
note will have a term of seven years, except that it will come due (if earlier)
one year after your employment terminates for any reason. The note will bear
interest at the applicable federal rate (as announced by the Internal Revenue
Service from time to time), and it will provide for principal and interest to be
payable in a lump sum on the due date. The Company will register the shares of
its Common Stock acquired or to be acquired under the option on a Form S-8
Registration Statement as soon as reasonably practicable after the Company's
initial public offering.

     For purposes of this letter, "Cause" means (i) unauthorized use or
disclosure of the confidential information or trade secrets of the Company which
is materially injurious to the 



                                       2
<PAGE>   3

Company; (ii) any breach of this letter agreement, the Proprietary Information
and Inventions Agreement between you and the Company, or any other agreement
between you and the Company, if the breach is materially injurious to the
Company, (iii) conviction of, or a plea of "guilty" or "no contest" to, a felony
under the laws of the United States or any state, (iv) demonstrably willful
misconduct which is materially injurious to the Company and which is not cured
within 60 days after you received written notice specifying such misconduct or
(v) gross negligence in the performance of duties assigned to you.

     For purposes of this letter, "Constructive Termination" means (i) a
material reduction of your duties, authority or responsibilities, (ii) any
reduction in your title, (iii) a change in your reporting relationship requiring
you to report to any person other than the Company's Chief Executive Officer,
(iv) a reduction of your salary or bonus, as in effect immediately before the
Change in Control, or (v) the relocation of your principal place of employment,
if the distance between your new office and your office immediately before the
relocation is more than 35 miles.

4. FUTURE OPTION GRANTS. Starting on April 2, 2001, you will be eligible to
participate in the Company's evergreen option grant program and to annually
receive an additional option to purchase a number of shares of the Company's
Common Stock equal to at least 75,000 shares but in no event less than the
number of shares subject to the annual evergreen option grant of any other
officer of the Company (other than the Chief Executive Officer). To qualify for
the annual grant, you must have remained in your position as Chief Financial
Officer and had satisfactory performance for the preceding year. The exercise
price of each option will be equal to the fair market value of the Company's
Common Stock on the date of grant and will be subject to the standard vesting
and other provisions under the Company's form of stock option agreement.

5. EMPLOYEE INVENTION ASSIGNMENT AND CONFIDENTIALITY AGREEMENT. Like all Company
employees, you will be required, as a condition to your employment with the
Company, to sign the Company's standard Invention Assignment and Confidentiality
Agreement.

6. PERIOD OF EMPLOYMENT. Your employment with the Company will be "at will,"
meaning that either you or the Company will be entitled to terminate your
employment at any time and for any reason, with or without cause. Any contrary
representations which may have been made to you are superseded by this offer.
This is the full and complete agreement between you and the Company on this
term. Although your job duties, title, compensation and benefits, as well as the
Company's personnel policies and procedures, may change from time to time, the
"at will" nature of your employment may only be changed in an express written
agreement signed by you and a duly authorized officer of the Company.

7. SEVERANCE PAY. If the Company terminates your employment for any reason other
than Cause, and if no Change in Control has occurred, then the Company will
continue to pay your base salary for a period of 12 months following the
termination of your employment, subject to your not breaching the
non-competition and non-solicitation provisions set forth below. Your base
salary will be paid at the rate in effect at the time of the termination of your
employment and in accordance with the Company's standard payroll procedures. In
addition, subject to your 


                                       3
<PAGE>   4

not breaching the non-competition and non-solicitation provisions set forth
below, you and your eligible dependents will be entitled to continue
participating in all of the Company's employee benefit programs for a period of
12 months following the termination of your employment, subject to the terms of
any insurance policies or other contracts applicable to such programs. In
addition, you will receive one year's accelerated vesting under your stock
option and/or restricted stock purchase agreements with the Company (which shall
be in addition to any accelerated vesting pursuant to paragraph 3(b) hereof).
If, after a Change in Control, the Company terminates your employment for any
reason other than Cause or you are subject to a Constructive Termination, then
the Company will pay you a lump sum equal to 130% of your annual base salary,
calculated at the rate in effect at the time of the termination of your
employment or (if greater) at the rate in effect immediately before the Change
in Control. The payment will be made at the time of the termination of your
employment.

     During your employment and during any continuation of salary period
referred to in the preceding paragraph (the "Continuation Period"), you agree
not to: (i) undertake any planning for any outside business activity that is
competitive with the Company; or (ii) directly or indirectly own any interest
in, manage, control, participate in (whether as an officer, director, employee,
partner, agent, representative or otherwise), consult with, render services for,
or in any manner engage in any business directly competing with the Company and
engaged in such business anywhere within any state, possession, territory, or
jurisdiction of the United States of America.

     During your employment and any Continuation Period, you also agree not to
directly or indirectly solicit or attempt to solicit either (i) the employment
of any employee of the Company or any of the Company's affiliates, or (ii) the
business of any customer of the Company or any of the Company's affiliates with
whom you had contact during your employment hereunder.

8. PARACHUTE EXCISE TAX. In the event that the severance and other benefits
provided for in this agreement or otherwise payable to you (a) constitute
"parachute payments" within the meaning of Section 280G of the Internal Revenue
Code of 1986, as amended (the "Code") and (b) but for this Section 8, would be
subject to the excise tax imposed by Section 4999 of the Code, then such
benefits shall be either be:

     (i)  delivered in full, or

     (ii) delivered as to such lesser extent which would result in no portion of
          such severance benefits being subject to excise tax under Section 4999
          of the Code,

whichever of the foregoing amounts, taking into account the applicable federal,
state and local income taxes and the excise tax imposed by Section 4999, results
in the receipt by you, on an after-tax basis, of the greatest amount of
benefits, notwithstanding that all or some portion of such benefits may be
taxable under Section 4999 of the Code. Unless the Company and you otherwise
agree in writing, any determination required under this Section 8 shall be made
in writing by the Company's independent public accountants immediately prior to
Change of Control (the "Accountants"), whose determination shall be conclusive
and binding upon you and 



                                       4
<PAGE>   5

the Company for all purposes. For purposes of making the calculations required
by this Section 8, the Accountants may make reasonable assumptions and
approximations concerning applicable taxes and may rely on reasonable, good
faith interpretations concerning the application of Sections 280G and 4999 of
the Code. The Company and you shall furnish to the Accountants such information
and documents as the Accountants may reasonably request in order to make a
determination under this Section. The Company shall bear all costs the
Accountants may reasonably incur in connection with any calculations
contemplated by this Section 8. Notwithstanding the foregoing, you shall be
entitled to at least as favorable protection to the excise tax imposed by
Section 4999 of the Code as is afforded to any other executive officer of the
Company.

9. WITHHOLDING TAXES. All forms of compensation referred to in this letter are
subject to reduction to reflect applicable withholding and payroll taxes.

10. ENTIRE AGREEMENT. This letter and the Company's standard Invention
Assignment and Confidentiality Agreement contain all of the terms of your
employment with the Company and supersede any prior understandings or
agreements, whether oral or written, between you and the Company.

11. AMENDMENT AND GOVERNING LAW. This letter agreement may not be amended or
modified except by an express written agreement signed by you and a duly
authorized officer of the Company. The terms of this letter agreement and the
resolution of any disputes will be governed by California law.

12. ARBITRATION AND EQUITABLE RELIEF.

               (a) Except as provided in Section 12(d) below, you agree that any
dispute or controversy arising out of, relating to, or in connection with this
Agreement, or the interpretation, validity, construction, performance, breach,
or termination thereof shall be settled by arbitration to be held in Santa Clara
County, California, in accordance with the National Rules for the Resolution of
Employment Disputes then in effect of the American Arbitration Association (the
"Rules"). The arbitrator may grant injunctions or other relief in such dispute
or controversy. The decision of the arbitrator shall be final, conclusive and
binding on the parties to the arbitration. Judgment may be entered on the
arbitrator's decision in any court having jurisdiction.

               (b) The arbitrator shall apply California law to the merits of
any dispute or claim, without reference to rules of conflict of law. The
arbitration proceedings shall be governed by federal arbitration law and by the
Rules, without reference to state arbitration law. You hereby expressly consent
to the personal jurisdiction of the state and federal courts located in
California for any action or proceeding arising from or relating to this
Agreement and/or relating to any arbitration in which the parties are
participants.

               (c) The Company and you shall each pay one-half of the costs and
expenses of such arbitration, and shall separately pay its counsel fees and
expenses.



                                       5
<PAGE>   6

               (d) You understand that nothing in Section 12 modifies
Executive's at-will status. Either the Company or you can terminate the
employment relationship at any time, with or without cause.

               (e) YOU HAVE READ AND UNDERSTANDS SECTION 12, WHICH DISCUSSES 
ARBITRATION. YOU UNDERSTAND THAT BY SIGNING THIS AGREEMENT, YOU AGREE TO SUBMIT
ANY FUTURE CLAIMS ARISING OUT OF, RELATING TO, OR IN CONNECTION WITH THIS
AGREEMENT, OR THE INTERPRETATION, VALIDITY, CONSTRUCTION, PERFORMANCE, BREACH,
OR TERMINATION THEREOF TO BINDING ARBITRATION, AND THAT THIS ARBITRATION CLAUSE
CONSTITUTES A WAIVER OF YOUR RIGHT TO A JURY TRIAL AND RELATES TO THE RESOLUTION
OF ALL DISPUTES RELATING TO ALL ASPECTS OF THE EMPLOYER/EXECUTIVE RELATIONSHIP.


               We hope that you find the foregoing terms acceptable. You may
indicate your agreement with these terms and accept this offer by signing and
dating the enclosed duplicate original of this letter and returning it to me. As
required by law, your employment with the Company is also contingent upon your
providing legal proof of your identity and authorization to work in the United
States. This offer, if not accepted, will expire at the close of business on
April 5, 1999.

               We look forward to having you join us on May 3, 1999.

               If you have any questions, please call me.

                                   Very truly yours,

                                   BROCADE COMMUNICATIONS SYSTEMS, INC.



                                   By: /s/ Gregory L. Reyes
                                      ------------------------------------------
                                       Chief Executive Officer



I have read and accept this employment offer:


/s/ Michael J. Byrd
- ---------------------------------------------
Signature of Michael J. Byrd

Dated:  April 7, 1999



                                       6

<PAGE>   1
                                                                    EXHIBIT 23.1


                   CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS

As independent public accountants, we hereby consent to the use of our reports 
and to all references to our Firm included in or made a part of this 
registration statement.



                                   ARTHUR ANDERSEN LLP

San Jose, California
May 4, 1999


<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   6-MOS                   YEAR
<FISCAL-YEAR-END>                          OCT-31-1999             OCT-31-1998
<PERIOD-START>                             NOV-01-1998             NOV-01-1997
<PERIOD-END>                               APR-30-1999             OCT-31-1998
<CASH>                                           8,668                  10,420
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    8,743                   3,715
<ALLOWANCES>                                       289                     285
<INVENTORY>                                      2,758                   1,744
<CURRENT-ASSETS>                                21,866                  15,814
<PP&E>                                          10,013                   8,965
<DEPRECIATION>                                   4,561                   3,642
<TOTAL-ASSETS>                                  27,450                  21,301
<CURRENT-LIABILITIES>                           16,085                  10,538
<BONDS>                                              0                       0
                           37,421                  35,909
                                          0                       0
<COMMON>                                        13,765                   2,225
<OTHER-SE>                                    (42,066)                (29,580)
<TOTAL-LIABILITY-AND-EQUITY>                    27,450                  21,301
<SALES>                                         16,969                  22,414
<TOTAL-REVENUES>                                18,547                  24,246
<CGS>                                            8,758                  15,759
<TOTAL-COSTS>                                    8,758                  15,759
<OTHER-EXPENSES>                                12,512                  23,718
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                (36)                   (120)
<INCOME-PRETAX>                                (2,687)                (15,111)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                            (2,687)                (15,111)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (2,687)                (15,111)
<EPS-PRIMARY>                                    (.57)                  (4.44)
<EPS-DILUTED>                                    (.57)                  (4.44)
        

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