CISCO SYSTEMS INC
S-3, 1999-06-04
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>   1

      AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON JUNE 4, 1999
                                                      REGISTRATION NO. 333-
================================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

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

                                    FORM S-3
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933

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

                               CISCO SYSTEMS, INC.
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)

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

<TABLE>
<S>                                                       <C>
           CALIFORNIA                                          77-0059951
(STATE OR OTHER JURISDICTION OF                             (I.R.S. EMPLOYER
 INCORPORATION OR ORGANIZATION)                           IDENTIFICATION NUMBER)
</TABLE>

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

                              170 WEST TASMAN DRIVE
                           SAN JOSE, CALIFORNIA 95134
                                 (408) 526-4000
               (ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
       INCLUDING AREA CODE, OF REGISTRANT'S PRINCIPAL EXECUTIVE OFFICES)

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

                                JOHN T. CHAMBERS
                      PRESIDENT AND CHIEF EXECUTIVE OFFICER
                               CISCO SYSTEMS, INC.
                              255 WEST TASMAN DRIVE
                           SAN JOSE, CALIFORNIA 95134
                                 (408) 526-4000
          (NAME AND ADDRESS, INCLUDING ZIP CODE, AND TELEPHONE NUMBER,
                   INCLUDING AREA CODE, OF AGENT FOR SERVICE)

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

                                    Copy to:
                             THERESE A. MROZEK, ESQ.
                         BROBECK, PHLEGER & HARRISON LLP
                              TWO EMBARCADERO PLACE
                                 2200 GENG ROAD
                           PALO ALTO, CALIFORNIA 94303
                                 (650) 424-0160

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

        APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:
     From time to time after this registration statement becomes effective.


     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]

     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, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box. [X]

     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 statement 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. [ ]

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

<TABLE>
<CAPTION>
                                        CALCULATION OF REGISTRATION FEE
=============================================================================================================
      Title of Each                 Amount         Proposed Maximum        Proposed Maximum        Amount of
    Class of Securities             to Be         Aggregate Offering          Aggregate          Registration
     to be Registered             Registered      Price Per Share(1)      Offering Price(1)           Fee
- -------------------------------------------------------------------------------------------------------------
<S>                                <C>                 <C>                 <C>                      <C>
Common Stock,
$0.001 par value per share         2,682,295           $107.063              $287,174,550          $79,834
=============================================================================================================
</TABLE>

(1)  The price of $107.063 the average of the high and low prices of Cisco's
     common stock on the Nasdaq Stock Market's National Market on June 1, 1999,
     is set forth solely for the purpose of computing the registration fee
     pursuant to Rule 457(c).

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

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 THAT 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 SEC, ACTING PURSUANT TO SAID SECTION 8(A),
MAY DETERMINE.

================================================================================

<PAGE>   2

                     SUBJECT TO COMPLETION DATED ___, 1999

                             Preliminary Prospectus

     The information contained in this preliminary prospectus is not complete
and may be changed. These securities may not be sold until the registration
statement filed with the Securities and Exchange Commission is effective. This
preliminary prospectus is not an offer to sell these securities and it is not
soliciting an offer to buy these securities in any state jurisdiction where the
offer or sale is not permitted.


                                2,682,295 SHARES


                               CISCO SYSTEMS, INC.
                                  COMMON STOCK



     This Prospectus relates to the public offering, which is not being
underwritten, of 2,682,295 shares of our Common Stock which is held by some of
our current shareholders.

     The prices at which such shareholders may sell the shares will be
determined by the prevailing market price for the shares or in negotiated
transactions. We will not receive any of the proceeds from the sale of the
shares.

     Our Common Stock is quoted on the Nasdaq National Market under the symbol
"CSCO." On June 1, 1999, the average of the high and low price for the Common
Stock was $107.063.

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

     Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or passed upon the
adequacy or accuracy of this prospectus. Any representation to the contrary is a
criminal offense.

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


================================================================================

                 The date of this Prospectus is June __, 1999.


                                       2

<PAGE>   3

     No person has been authorized to give any information or to make any
representations other than those contained in this Prospectus in connection with
the offering made hereby, and if given or made, such information or
representations must not be relied upon as having been authorized by Cisco
Systems, Inc. (referred to in this Prospectus as "Cisco" or the "Registrant"),
any selling shareholder or by any other person. Neither the delivery of this
Prospectus nor any sale made hereunder shall, under any circumstances, create
any implication that information herein is correct as of any time subsequent to
the date hereof. This Prospectus does not constitute an offer to sell or a
solicitation of an offer to buy any security other than the securities covered
by this Prospectus, nor does it constitute an offer to or solicitation of any
person in any jurisdiction in which such offer or solicitation may not lawfully
be made.

                       WHERE YOU CAN FIND MORE INFORMATION

     We file annual, quarterly and special reports, proxy statements and other
information with the SEC. You may read and copy any document we file at the
SEC's public reference rooms in Washington, D.C., New York, New York and
Chicago, Illinois. Please call the SEC at 1-800-SEC-0330 for further information
on the public reference rooms. Our SEC filings are also available to the public
from our web site at http://cisco.com or at the SEC's web site at
http://www.sec.gov.

     The SEC allows us to "incorporate by reference" the information we file
with them, which means that we can disclose important information to you by
referring you to those documents. The information incorporated by reference is
considered to be part of this prospectus, and later information filed with the
SEC will update and supersede this information. We incorporate by reference the
documents listed below and any future filings made with the SEC under Section
13a, 13(c), 14, or 15(d) of the Securities Exchange Act of 1934 until our
offering is completed.

     1.   Annual Report on Form 10-K for the year ended July 25, 1998, filed
          September 25, 1998, including certain information in Cisco's
          Definitive Proxy Statement in connection with Cisco's 1998 Annual
          Meeting of Shareholders and certain information in Cisco's Annual
          Report to Shareholders for the fiscal year ended July 25, 1998;

     2.   Cisco's Quarterly Report on Form 10-Q for the fiscal year ended
          October 24, 1998, filed December 8, 1998;

     3.   Cisco's Quarterly Report on Form 10-Q for the fiscal quarter ended
          January 23, 1999, filed March 9, 1999, as amended May 14, 1999;

     4.   Cisco's Current Report on Form 8-K filed May 14, 1999;

     5.   The description of Cisco common stock contained in its registration
          statement on Form 8-A filed January 8, 1990, including any amendments
          or reports filed for the purpose of updating such descriptions; and

     6.   The description of Cisco's Preferred Stock Purchase Rights, contained
          in its registration statement on Form 8-A filed on June 11, 1998,
          including any amendments or reports filed for the purpose of updating
          such description.

     You may request a copy of these filings, at no cost, by writing or
telephoning us at the following address:

          Cisco Systems, Inc.
          Investor Relations Department
          255 West Tasman Drive
          San Jose, CA 95134
          408-526-4000


                                       3

<PAGE>   4

     You should rely only on the information incorporated by reference or
provided in this prospectus or the prospectus supplement. We have authorized no
one to provide you with different information. We are not making an offer of
these securities in any state where the offer is not permitted. You should not
assume that the information in this prospectus or the prospectus supplement is
accurate as of any date other than the date on the front of the document.

                                   THE COMPANY

     Cisco's principal executive offices are located at 255 West Tasman Drive,
San Jose, California 95134. Cisco's telephone number is (408) 526-4000.

                              PLAN OF DISTRIBUTION

     Cisco is registering all 2,682,295 shares (the "Shares") on behalf of
certain selling shareholders. All of the shares either originally were issued by
us in connection with our acquisition of Fibex Systems. We merged with Fibex
Systems and we were the surviving corporation. Cisco will receive no proceeds
from this offering. The Selling Shareholders named in the table below or
pledgees, donees, transferees or other successors-in-interest selling shares
received from a named selling shareholder as a gift, partnership distribution or
other non-sale-related transfer after the date of this prospectus (collectively,
the "Selling Shareholders") may sell the shares from time to time. The Selling
Shareholders will act independently of Cisco in making decisions with respect to
the timing, manner and size of each sale. The sales may be made on one or more
exchanges or in the over-the-counter market or otherwise, at prices and at terms
then prevailing or at prices related to the then current market price, or in
negotiated transactions. The Selling Shareholders may effect such transactions
by selling the shares to or through broker-dealers. The shares may be sold by
one or more of, or a combination of, the following:

     o    a block trade in which the broker-dealer so engaged will attempt to
          sell the shares as agent but may position and resell a portion of the
          block as principal to facilitate the transaction,

     o    purchases by a broker-dealer as principal and resale by such
          broker-dealer for its account pursuant to this prospectus,

     o    an exchange distribution in accordance with the rules of such
          exchange,

     o    ordinary brokerage transactions and transactions in which the broker
          solicits purchasers, and

     o    in privately negotiated transactions.

     To the extent required, this prospectus may be amended or supplemented from
time to time to describe a specific plan of distribution. In effecting sales,
broker-dealers engaged by the Selling Shareholders may arrange for other
broker-dealers to participate in the resales.

     The Selling Shareholders may enter into hedging transactions with
broker-dealers in connection with distributions of the shares or otherwise. In
such transactions, broker-dealers may engage in short sales of the shares in the
course of hedging the positions they assume with Selling Shareholders. The
Selling Shareholders also may sell shares short and redeliver the shares to
close out such short positions. The Selling Shareholders may enter into option
or other transactions with broker-dealers which require the delivery to the
broker-dealer of the shares. The broker-dealer may then resell or otherwise
transfer such shares pursuant to this prospectus. The Selling Shareholders also
may loan or pledge the shares to a broker-dealer. The broker-dealer may sell the
shares so loaned, or upon a default the broker-dealer may sell the pledged
shares pursuant to this prospectus.

     Broker-dealers or agents may receive compensation in the form of
commissions, discounts or concessions from Selling Shareholders. Broker-dealers
or agents may also receive compensation from the purchasers of the shares for
whom they act as agents or to whom they sell as principals, or both.
Compensation as to a particular broker-dealer might be in excess of customary
commissions and will be in amounts to be negotiated in connection with the sale.
Broker-dealers or agents and any other participating broker-dealers or the
Selling Shareholders may be deemed to be "underwriters" within the meaning of
Section 2(11) of the Securities Act in connection with sales of the shares.
Accordingly, any such commission, discount or concession received by them and
any profit on the


                                       4

<PAGE>   5

resale of the shares purchased by them may be deemed to be underwriting
discounts or commissions under the Securities Act. Because Selling Shareholders
may be deemed to be "underwriters" within the meaning of Section 2(11) of the
Securities Act, the Selling Shareholders will be subject to the prospectus
delivery requirements of the Securities Act. In addition, any securities covered
by this prospectus which qualify for sale pursuant to Rule 144 promulgated under
the Securities Act may be sold under Rule 144 rather than pursuant to this
prospectus. The Selling Shareholders have advised Cisco that they have not
entered into any agreements, understandings or arrangements with any
underwriters or broker-dealers regarding the sale of their securities. There is
no underwriter or coordinating broker acting in connection with the proposed
sale of shares by Selling Shareholders.

     The shares will be sold only through registered or licensed brokers or
dealers if required under applicable state securities laws. In addition, in
certain states the shares may not be sold unless they have been registered or
qualified for sale in the applicable state or an exemption from the registration
or qualification requirement is available and is complied with.

     Under applicable rules and regulations under the Exchange Act, any person
engaged in the distribution of the shares may not simultaneously engage in
market making activities with respect to our common stock for a period of two
business days prior to the commencement of such distribution. In addition, each
Selling Shareholder will be subject to applicable provisions of the Exchange Act
and the associated rules and regulations under the Exchange Act, including
Regulation M, which provisions may limit the timing of purchases and sales of
shares of our common stock by the Selling Shareholders. Cisco will make copies
of this prospectus available to the Selling Shareholders and has informed them
of the need for delivery of copies of this prospectus to purchasers at or prior
to the time of any sale of the shares.

     Cisco will file a supplement to this prospectus, if required, pursuant to
Rule 424(b) under the Securities Act upon being notified by a Selling
Shareholder that any material arrangement has been entered into with a
broker-dealer for the sale of shares through a block trade, special offering,
exchange distribution or secondary distribution or a purchase by a broker or
dealer. Such supplement will disclose:

     o    the name of each such Selling Shareholder and of the participating
          broker-dealer(s),

     o    the number of shares involved,

     o    the price at which such shares were sold,

     o    the commissions paid or discounts or concessions allowed to such
          broker-dealer(s), where applicable,

     o    that such broker-dealer(s) did not conduct any investigation to verify
          the information set out or incorporated by reference in this
          prospectus, and

     o    other facts material to the transaction.

     In addition, upon being notified by a Selling Shareholder that a donee or
pledgee intends to sell more than 500 shares, Cisco will file a supplement to
this prospectus.

     Cisco will bear all costs, expenses and fees in connection with the
registration of the shares. The Selling Shareholders will bear all commissions
and discounts, if any, attributable to the sales of the shares. The Selling
Shareholders may agree to indemnify any broker-dealer or agent that participates
in transactions involving sales of the shares against certain liabilities,
including liabilities arising under the Securities Act. The Selling Shareholders
have agreed to indemnify certain persons, including broker-dealers and agents,
against certain liabilities in connection with the offering of the shares,
including liabilities arising under the Securities Act.


                                       5

<PAGE>   6

                              SELLING SHAREHOLDERS

     The following table sets forth the number of shares owned by each of the
Selling Shareholders. None of the Selling Shareholders has had a material
relationship with Cisco within the past three years other than as a result of
the ownership of the shares or other securities of Cisco. No estimate can be
given as to the amount of shares that will be held by the Selling Shareholders
after completion of this offering because the Selling Shareholders may offer all
or some of the shares and because there currently are no agreements,
arrangements or understandings with respect to the sale of any of the shares.
The shares offered by this prospectus may be offered from time to time by the
Selling Shareholders named below.

<TABLE>
<CAPTION>
                                              Number of Shares   Percent of     Number of Shares
                                                Beneficially     Outstanding     Registered for
Name of Selling Shareholder                        Owned           Shares        Sale Hereby(1)
- ---------------------------                   ----------------   -----------    ----------------
<S>                                                 <C>             <C>             <C>
Alta California Partners, L.P.(2)                   323,024          *              323,024

Alta Embarcadero Partners L.P.(3)                     7,378          *                7,378

Ascend Communications, Inc.                         935,653          *              935,653

Kenneth and Heather Buckland                        187,955          *              187,955

Virendra K. Budhraja                                187,955          *              187,955

Richard E. Hejmanowski                               95,419          *               95,419

Michael Jeye                                         45,504          *               45,504

NEA President's Fund, L.P.(4)                         7,913          *                7,913

NEA Ventures 1997, Limited(5)                         1,978          *                1,978

New Enterprise Associates VII,
    Limited Partnership(6)                          320,511          *              320,511

Arno Penzias                                         17,806          *               17,806

Seed Ventures II, Limited                            29,696          *               29,696

Walden EDB Partners, L.P.(7)                        112,034          *              112,034

Walden Japan Partners, L.P.(7)                       59,353          *               59,353

Walden SBIC, L.P.(7)                                107,761          *              107,761

Walden Technology Ventures, L.P.(7)                  21,557          *               21,557

30 additional Selling Shareholders, each of
    whom beneficially owns less than one-tenth
    of one percent of the total outstanding
    Common Stock of Cisco as of May 10, 1999.....   220,798          *              220,798
                                                  =========      =========        =========
         Total                                    2,682,295          *            2,682,295
</TABLE>

* Represents beneficial ownership of less than 1%.

(1)  This registration statement also shall cover any additional shares of
     common stock which become issuable in connection with the shares registered
     for sale hereby by reason of any stock divided, stock split,
     recapitalization or other similar transaction effected without the receipt
     of consideration which results in an increase in the number of Cisco's
     outstanding shares of common stock.

(2)  Subsequent to the date of this Prospectus, the Shares held by Alta
     California Partners, L.P. may be distributed to Zeid Masri; David E.
     Maxwell; Kenneth J. Simons; Theodore A. Bosler; Phillippe Nguyen; Brian
     Cobb; Elliott Evers; Peter Handy; Amos B. Hostetter, Jr.; Continental
     Investments Corporation LLC; George A.


                                       6

<PAGE>   7

     Needham; Timothy Neher; Edward Buxton; David Jacques; William J. Steding;
     Thomas E. Bertelsen; Sirjang Lal Tandon; Paul E. Ridgers;

(3)  Subsequent to the date of this Prospectus, the Shares held by Alta
     Embarcadero Partners L.P. may be distributed to Jean Deleage; Fran
     Kingsley; William P. Egan; Gregory Egan; Craig L. Burr; Garrett Gruener;
     Bryan Wood; Jeanne Meyer; Geoffrey R. Hoguet; Brian McNeill; James A.
     Terranova; Frank Polestra; Eileen McCarthy; Timothy L. Dibble; David
     Needham; David Retik.

(4)  Subsequent to the date of this Prospectus, the Shares held by NEA
     President's Fund, L.P. may be distributed to Abronson Trust Est. 9/22/81;
     Richard L. Adams, Jr.; Joseph W. Alsop; Robert K. Anderson; Andreessen 1996
     Charitable Remainder Trust; Paul and Evelyn Baran Trust Agreement of May
     23, 1984; M. James Barrett; Joshua S. Boger, Brody Family Trust U/T/D
     August 15, 1986; Bear Stearns Securities Corporation, Custodian for William
     R. Brody Master Defined Contribution M/P Pension Plan; Kevin J. Burns;
     Buuck Family Partnership; Chadwick H. Carpenter, Jr.; Robert J. Carpenter;
     Charney 1996 Trust u/a 6/24/96, Howard S. Charney & Alida C. S. Charney,
     Trustees; Jesse Chen & Wanpyng Chuang; Robert and Stacey Chess; John C.
     Colligan; W. Hudson Connery, Jr.; DIMA Ventures, Inc.; Lewis S. Edelheit;
     Morteza Ejabat; Daniel P. Finkelman; Cam L. Garner & Wanda D. Garner,
     Co-Trustees of The Garner Family Trust, dated October 21, 1987; Garrett A.
     Garrettson; Glynn Family Trust; Paul M. Goeld & Carmen M. Goeld, Trustees
     of Goeld Family Trust u/t/d/ 11/8/96; Adele Goldberg; Gary G. Greenfield;
     William J. Hamburg; Daniel L. Harple, Jr.; Jill Tate Higgins; Ironwood LLC;
     Jacob S. Jacobsson; L. George Klaus, Trustee of the George Klaus Trust;
     Joseph Anthony Liemandt; Earl L. Linehan; Jonathan J. MacQuitty; Joshua
     Makower; Lloyd H. Malchow; Manian Revocable Living Trust DTD 5/5/86 Bala S.
     Manian & Tasneem Ismailji, Trustees; Edward R. McCracken; The Sandhya
     McCracken Living Trust u/a 9/5/97; The Living Trust of Stephens F. Millard,
     dated 9/23/94; Alan C. Nelson and Sharon K. Everson, Jt. Tenants; James W.
     Newman; Bertil D. Nordin; James D. Norrod; Robert J. Paluck; Ronald S.
     Posner; Providence Investment Company Limited; C. Woodrow Rea Jr. Trust
     U/D/T 5/30/96; Francis C. Rienhoff; Timothy James Rink; Walter L. Robb;
     Theresa W. & Robert J. Ryan, Jt. Tenants; William A. Sahiman; John T.
     Sakai; Richard M. Scrushy; John W. Sidgmore; Michael J. Simmons; David A.
     Stamm; Charles W. Stein Trust, dated May 23, 1995, Charles W. Stein and
     Virginia M. Stein, Trustees; Richard J. Testa; Kent J. Thiry and Denise M.
     O'Leary, Trustees, Thiry/O'Leary Living Trust dated March 8, 1990;
     Tomasetta Trust dated May 28, 1996; Steven Wallach Retained Income Trust;
     L. Curtis Widdoes, Jr.; Delaware Charter Guarantee & Trust Co. , Cust:
     William E. Wilson; Yock Family Revocable Trust, dated 7/21/93; Michael D.
     Zisman; Peter J. Barris; Frank A. Bonsal, Jr.; Nancy L. Dorman; Ronald H.
     Kase; C. Richard Kramlich; Arthur J. Marks; Thomas C. McConnell; John M.
     Nehra; Charles W. Newhall, III; Mark W. Perry; Irrevocable Trust u/a Frank
     A. Bonsal, dated 02/23/93, c/o David J. Callard; Turner-McConnell Family
     Trust, Thomas C. McConnell and Latricia Ann Turner, Trustees, uta 8/29/96;
     Christopher H. Perry; Elise S. Perry

(5)  Subsequent to the date of this Prospectus, the Shares held by NEA Ventures
     1997, Limited may be distributed to Lou Van Dyck; Ryan Drant; Debra King;
     Chip Linehan; Hugh Rienhoff; Scott Sandell; Sigrid Van Bladel; Lynn
     Dennard; Nora Zietz; Suzanne King.

(6)  Subsequent to the date of this Prospectus, the Shares held by New
     Enterprise Associates VII, Limited Partnership may be distributed to Abbott
     Capital Private Equity Fund, L.P.; Richard L. Adams, Jr.; AJ Trusts
     Partnership; ALCYON SA; Alexandra R. Alsop; Elizabeth W. Alsop; Joseph W.
     Alsop; Joseph W. Alsop VII; Stewart J. O. Alsop Trust; Trustees of Amherst
     College; Argyropoulos Investors G.P.; Retirement Annuity Plan for Employees
     of the Army and Air Force Exchange Service Trust by Abbott Capital
     Management, L.P. as Investment Manager; Paul Baran or Evelyn Baran, as
     trustee of the Paul and Evelyn Baran Trust Agreement of 23 May 1984; Mellon
     Bank, N.A., as Trustee for the Bell Atlantic Master Trust (North); Mellon
     Bank, N.A. as Trustee for the Bell Atlantic Master Trust (South); Brinson
     Partnership Fund, L.P.; The 1996 Brinson Partnership Fund Offshore Series
     Company Ltd.; Brinson Trust Company as Trustee of The Brinson Partnership
     Fund Trust; Iceship & Co. by State Street Bank & Trust Co. as trustee for
     the Brown & Williamson Tobacco Master Retirement Trust; The Bunting Family
     II LLC; California State Teachers' Retirement System; Austen S. Cargill II
     Living Trust; Carleton College, by Abbott Capital Management, L.P. as
     Investment Manager; Nortrust Nominees Limited, Custodian for the Civil
     Aviation Authority Pension Scheme; Chancellor LGT Partnership Fund, L.P.;
     The Trustees of the Cheyne Walk Trust; Cornish & Carey Commercial Ventures,
     LLC; Cypress Equity Fund Group Trust, by Abbott Capital Management, L.P. as
     Investment Manager; Cypress Equity Fund Ltd., by Abbott Capital Management,
     L.P. as Investment Manager; Dragoo & Co.; The Ford Foundation; Mellon Bank,
     N.A. as Trustee of the General Motors Corp. Master Trust-Hourly-Rated
     Employees Pension Plan, as directed by Brinson Partners, Inc.; Mellon Bank,
     N.A. as Trustee of the General Motors Corp. Master Trust-Salaried Employees
     Non-Contributory Retirement Plan, as directed by Brinson


                                       7

<PAGE>   8

     Partners, Inc.; Goldman Grandchildren 1986 Trust; Guayacan Fund of Funds,
     L.P. by Abbott Capital Management, L.P. as Investment Advisor; HarbourVest
     Partners V-Parallel Partnership Fund L.P.; HarbourVest Partners
     V-Partnership Fund L.P.; Michael E. Herman Revocable Trust; Northern Trust
     Company as Trustee for the Illinois Municipal Retirement Fund, by Abbott
     Capital Management, L.P., as Investment Manager; The James Irvine
     Foundation; JMJ Trusts Partnership; Kaatz Family Limited Partnership II;
     Ewing Marion Kauffman Foundation; Kleinwort Benson Holdings, Inc.; Bernard
     M. Kramer, M.D. Inc. Profit Sharing Plan; Leeway & Co.; Board of Pensions
     Commissioners of the City of Los Angeles, by Abbott Capital Management,
     L.P., as Investment Advisor; Merifin Capital N.V.; Meyer Memorial Trust;
     MILAGRO DE LADERA, L.P., a California Limited Partnership; Mario M. Morino
     Trust; Paul C. Nehra; New Mexico State Investment Council as directed by
     Brinson Partners, Inc.; Commonwealth of Pennsylvania State Employees'
     Retirement System; Picotte Family Private Fund, LLC; Pratt Street Ventures
     IX, LLC; The Trustees of The Ronald Family Trust B; NationsBank of Texas
     N.A. as Trustee for SBC Master Pension Trust; James M. Schlater; John
     Sidgmore; Skytop Associates; Standish Ventures IV; State Universities
     Retirement System, as directed by Brinson Partners, Inc.; The Sumitomo
     Bank, Limited, Cayman Branch; Swingyer Partners; The Northern Trust Company
     as Trustee for U.A. Local 467 Pension Trust; Utah Retirement Systems, by
     Abbott Capital Management, L.P., as Investment Manager; Venture
     Capital/Private Equity Fund; Virginia Retirement System; The Northern Trust
     Company as Trustee of The Vulcan Materials Company Master Pension Trust;
     Warburg, Pincus Post-Venture Capital Fund, Inc., by Abbott Capital
     Management, L.P., as Investment Advisor; University of Washington; Board of
     Trustees of Whitman College; Woodbrook MB Limited Partnership; Michael D.
     Zisman; Peter J. Barris; Nancy L. Dorman; Ronald H. Kase; C. Richard
     Kramlich; Arthur J. Marks; Thomas C. McConnell; Peter T. Morris; John M.
     Nehra; Charles W. Newhall III; Mark W. Perry; Limited Partners: Abingworth
     Management Ltd.; The Stewart Alsop II Revocable Trust dated 10/8/93,
     Stewart Alsop II, Trustee; The Peter J. Barris Family Trust of 1996, u/a
     11/14/96, Adrienne Barris & Jeffrey Radowich, Trustees; Irrevocable Trust
     u/a Frank A. Bonsal, Jr., dated 2/23/93; Virginia Lauren Kase Trust, u/a
     9/10/96 Thomas C. McConnell, Trustee; Ryan Harrison Kase Trust, u/a
     9/10/96, Thomas C. McConnell, Trustee; Debra E. King; Robert F. Kuhling,
     Jr.; Charles M. Linehan; Darlene K. Mann; The Joshua Joseph Marks Trust,
     u/a 11/13/96, Joshua J. Marks; Trustee; The Michael Shannon Marks Trust u/a
     11/13/96, Joshua J. Marks, Trustee; The Samantha Ariel Marks Trust, u/a
     11/13/96, Joshua J. Marks, Trustee; Turner-McConnell Family Trust, Thomas
     C. McConnell and Latricia Ann Turner, Trustees uta 8/29/96; McConnell Twins
     Trust, Ronald H. Kase, Trustee, uta dated 11/11/93; Cole Whieldon McConnell
     Trust, Ronald H. Kase, Trustee, uta dated 3/23/95; MWP Investment
     Partnership; Scott Morris Trust u/a 6/30/97, Mark W. Perry, Trustee; The
     Kathryn S. Nehra Trust, u/a 12/22/93, Charles Noel & Robin Wessels,
     Trustees; The Lauren M. Nehra Trust, u/a 12/22/93, Charles Noel & Robin
     Wessels, Trustees; Susan L. Nehra; Amy Liebno Newhall; Adair Newhall;
     Ashton Newhall; Adair's Trust u/a 11/15/96, Amy Liebno Newhall, Frank A.
     Bonsal, C. Van Leuven Stewart, Trustees; Ashton's Trust u/a 11/15/96, Amy
     Liebno Newhall, Frank A. Bonsal, C. Van Leuven Stewart, Trustees; Terry L.
     Opdendyk; Pratt Street Ventures IX, Limited Partnership; Scott D. Sandell;
     Sigrid J. Van Bladel; Louis B. Van Dyck IV; Thomas E. Winter; Nora M.
     Zietz.

(7)  Subsequent to the date of this Prospectus, the Shares collectively held by
     Walden EDB Partners, Walden Japan Partners, Walden SBIC, L.P. and Walden
     Technologies Ventures L.P. may be distributed to Marc L, Abramowitz and
     Anita L. Abramowitz; Mathilde Albers; Pauline Lo Alker; Herb Alpert;
     Barbara Ancona; ARBA, A California General Partnership; Kent Baum and Marie
     Jose Melief Baum; Steven Berger and Paula Hughmanick; Arthur S. Berliner
     Family Trust Dtd 4/24/85; Nicholas J. Bez; Timothy Blair Billington; Elton
     J. Blum; Joseph Bhrm; Charles S.G. Bolton; Stewart Bonn and Laurel Bonn,
     Ttses under Declaration of Trust Dtd 7/21/94; Eugene D. Brody; Keith A.
     Brooks, D.M.D. Self Employed Profit Sharing; J. Carlo Cannell and Jennifer
     Bradley Cannell; Cardinal Partners; Douglas G. Carlston; Richard Carpenter;
     Maryles Castro; Chais 1991 Family Trust, Stanley Chais and Pamela Chais,
     Trustees; Shirley Chan; C. Philip Chapman and Donna R. Chapman; Chester and
     Catherine Chastek; Clickstream Capital L.L.C.; Christopher Cochrane; Paul
     Coghlan; Third Amended Trust of Gregory Lee Collins; Columbia General
     Investment L.P.; The Corrigan Family Partners, A CA Ltd Partnership;
     Marshall George Cox; Cypress VI Partners; Som Das; Annette R. Dobbs; Glen
     Doshay and Karen Doshay; EDB Ventures 2 Pte Ltd; William W.R. & Gloria L.S.
     Elder, Ttees-Elder Family Trust UDT Dtd 12/2/88; Steve Eskenazi; Daniel
     Faizullabhoy; Richard N. Frank Living Trust Dated 1/21/88, R.N. Frank
     Trustee; The Friedman Revocable Trust, S. & M.W. Friedman Co-Trustees Dated
     8/2/89; The Friedman Group Ltd.; Friend Friend & Friend; E. Garfinkle; J.
     Garfinkle; E. Goldsteins Successor Ttee of the Goldstein Farm Trust Dtd
     5/11/90, as tenants-in-common; Paul Ginsburg; Anthony Michael Glassman;
     Ernest C. Goggio; Goldman-Valerlote Family Trust UDT 11/15/95; Barry
     Goldstein; George J.W. Goodman; Rakinder Grovey; James Hansen & Betsy
     Hansen Living Trust Dtd 12/9/93, J&B Hansen as Co-Trustees; Harriet Hansen
     Living Trust Dtd 12/2/93 Harriet Hansen, Trustee; Ann Hedges Revocable
     Trust Dtd 6/22/93 Ann Hedges Trustee; Howard Properties Money Purchase
     Pension Plan & Trust Dtd 5/30/76; Charles Itsu; Norman C. & Marie H. Jack
     Trustee UTD Living Revocable Trust Dated 12/11/86; Estate of Stephen
     Johnes; K & L Properties; Andrew Ksu; Prudential Securities C/F Norman A.
     Kidd IRA A/C #JE-R25568; David S. Lambert & Carol A. Lambert; Robert A.
     Lanford; The Lauek Family 1994 Revocable Trust Dtd 11-16-94, J.S. & K.L.
     Lauek, Trees; Le Hagen Partners, Ltd.; Chong-Moon Lee and Reiko Takahashi
     Lee; Nancy Y. Lee; Paul Lee; Paul and Kathryn Leitner; Agnes Victoria
     Linhardt 1994 Revocable Inter Vivos Trust, Agnes Linhardt, Ttee; Irving
     Loube; M.E.K. Holdings Corporation; Daniel Mao; Ken J. McEwan; Jerome S.
     Moss; M.V. Partners, L.P. Lawrence & Eleanor Myers Family Trust Dtd
     12/18/75, Lawrence Myers, Trustee; Caryn A. Peck; Lorraine F. Petitfils,
     Trustee Lorraine F. Petitfils, Trust UDT Dated 1/19/89; Wayne A. Ricciardi
     and Wendy L. Ricciardi; Robbins and Myers; Charles Richard Rose Irrevocable
     Trust Dtd 11/27/96, Robert Schweich, Trustee Robert S. and Valerie
     Rubenstein as Community Property; Lawrence K. Samuels; Steve Sanghi; Guy
     and Jean Saperstein; George S. Sarlo Revocable Trust Dtd 12/23/91; Francis
     O. Scarpulla; Trust Agreement Dtd 11/1/93 FBO William J. & Marlilee J.
     Schroeder, Trustees; Betty Jane Schuss Trust, Jack Schuss, Trustee; Robert
     J. Schweich; Lee J. Schweichler and Ann W. Schweichler; Small Business
     Administration; David S. Steiner; Sumitomo Corporation; Sumitomo
     Deutschland GMBH; Sumitronics, Inc.; Roger E. Susi; William P. Tai; Lip-Bu
     Tan and Ysa Loo Trust Dtd 2/3/92; Chun Choy Tang; Targa Capital, Ltd.; J.
     Stephen and Nancy Thornborrow; Thomas and Janet Unterman Living Trust Dated
     12/1/1994; James M. Usdam; Vencap Holdings (1992) Pte. Ltd.; Verona
     Investments, Inc.; Vartex Venture Holdings Pte Ltd.; Peter K. Wanger, Jr.;
     Werner Wolfen; Chia Lung Yeh and Huey Ling Wang; and Richard Young.

                                 LEGAL MATTERS

          The validity of the securities offered hereby will be passed upon for
Cisco by Brobeck, Phleger & Harrison LLP, Palo Alto, California.


                                       8

<PAGE>   9

                                     EXPERTS

     The consolidated balance sheets as of July 25, 1998 and July 26, 1997 and
the consolidated statements of operations, shareholders' equity and cash flows
for each of the three years in the period ended July 25, 1998 incorporated by
reference in this prospectus, have been incorporated herein in reliance on the
report of PricewaterhouseCoopers LLP, independent accountants, given on the
authority of that firm as experts in accounting and auditing.


                                       9

<PAGE>   10

================================================================================

We have not authorized any person to make a statement that differs from what is
in this prospectus. If any person does make a statement that differs from what
is in this prospectus, you should not rely on it. This prospectus is not an
offer to sell, nor is it seeking an offer to buy, these securities in any state
in which the offer or sale is not permitted. The information in this prospectus
is complete and accurate as of its date, but the information may change after
that date.


                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                 Page
                                                                 ----
<S>                                                               <C>
Where You Can Find More Information................................3
The Company........................................................4
Plan of Distribution...............................................4
Selling Shareholders...............................................6
Legal Matters......................................................8
Experts............................................................9
</TABLE>


================================================================================


                               CISCO SYSTEMS, INC.



                                2,682,295 SHARES
                                 OF COMMON STOCK


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

                                   PROSPECTUS

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



                                June [___], 1999


================================================================================

<PAGE>   11

                                     PART II
                     INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14. OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth the costs and expenses, other than
underwriting discounts and commissions, payable by Cisco in connection with the
sale of common stock being registered. All amounts are estimates except the SEC
registration fee.

<TABLE>
<S>                                                <C>
     SEC Registration fee                          $79,834
     Legal fees and expenses                        15,000
     Accounting fees and expenses                    5,000
     Printing Fees                                   5,000
     Transfer Agent Fees                             5,000
     Miscellaneous                                  11,000
                                                 ---------
          Total                                   $120,834
                                                 =========
</TABLE>


ITEM 15. INDEMNIFICATION OF DIRECTORS AND OFFICERS

     Section 317 of the California Corporations Code authorizes a court to
award, or a corporation's Board of Directors to grant, indemnity to directors
and officers in terms sufficiently broad to permit indemnification, including
reimbursement of expenses incurred, under certain circumstances for liabilities
arising under the Securities Act. Cisco's Restated Articles of Incorporation, as
amended, and Amended Bylaws provide for indemnification of its directors,
officers, employees and other agents to the maximum extent permitted by the
California Corporations Code. In addition, Cisco has entered into
indemnification agreements with each of its directors and officers.

ITEM 16. EXHIBITS

<TABLE>
<S>       <C>
 2.1      Agreement of Merger between Cisco Systems, Inc. and Fibex Systems.
 5.1      Opinion of Brobeck, Phleger & Harrison LLP
23.1      Consent of PricewaterhouseCoopers LLP
23.2      Consent of Brobeck, Phleger & Harrison LLP (included in the Opinion of
          Brobeck, Phleger & Harrison LLP filed as Exhibit 5.1 hereto)
24.1      Power of Attorney (included on page II-3 of this registration statement)
</TABLE>


ITEM 17. UNDERTAKINGS

The undersigned registrant hereby undertakes:

     (1)  To file, during any period in which offers or sales are being made, a
post-effective amendment to this registration statement: (i) to include any
prospectus required by Section 10(a)(3) of the Securities Act; (ii) to reflect
in the prospectus any facts or events arising after the effective date of the
registration statement, or the most recent post-effective amendment thereof,
which, individually or in the aggregate, represent a fundamental change in the
information set forth in the registration statement; and (iii) to include any
material information with respect to the plan of distribution not previously
disclosed in the Registration Statement or any material change to such
information in the registration statement.

     (2)  That, for the purpose of determining any liability under the
Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

     (3)  To remove from registration by means of a post-effective amendment any
of the securities being registered which remain unsold at the termination of the
offering.


                                      II-1

<PAGE>   12

     Insofar as indemnification for liabilities arising under the Securities Act
may be permitted to directors, officers and controlling persons of the
registrant pursuant to the foregoing provisions or otherwise, the registrant has
been advised that in the opinion of the SEC such indemnification is against
public policy as expressed in the Securities Act and therefore is 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, for purposes of
determining any liability under the Securities Act, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Exchange Act, and, where applicable, each filing of an employee benefit plan's
annual report pursuant to Section 15(d) of the Exchange Act, that is
incorporated by reference in the registration statement shall be deemed to be a
new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.


                                      II-2

<PAGE>   13

                                   SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933 the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-3 and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized in the City of Santa Clara, State of California, on this 4th day of
June, 1999.

                                         CISCO SYSTEMS, INC.


                                         By /s/ John T. Chambers
                                            ------------------------------------
                                            John T. Chambers,
                                            President, Chief Executive Officer
                                            and Secretary

     KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below constitutes and appoints John T. Chambers and Larry R. Carter, and each of
them, as his true and lawful attorneys-in-fact and agents, with full power of
substitution and resubstitution, for him and in his name, place and stead, in
any and all capacities, to sign any and all amendments (including post-effective
amendments) to this registration statement, and to file same, with all exhibits
thereto, and other documents in connection therewith, with the Securities and
Exchange Commission, granting unto said attorneys-in-fact and agents, and each
of them, full power and authority to do and perform each and every act and thing
requisite and necessary to be done in connection therewith, as fully to all
intents and purposes as he might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents, and any of them, or their
or his substitutes, may lawfully do or cause to be done by virtue thereof.

     Pursuant to the requirements of the Securities Act of 1933, as amended,
this registration statement has been signed below by the following persons on
behalf of Cisco and in the capacities and on the dates indicated:

<TABLE>
<CAPTION>
SIGNATURES                                      TITLE                         DATE
- ----------                                      -----                         ----
<S>                               <C>                                      <C>

/s/ John T. Chambers              President, Chief Executive Officer       June 4, 1999
- ------------------------------    and Director
John T. Chambers                  (Principal Executive Officer)

/s/ Larry R. Carter               Senior Vice President, Finance and       June 4, 1999
- ------------------------------    Administration, Chief Financial
Larry R. Carter                   Officer and Secretary (Principal
                                  Financial and Accounting Officer)


/s/ John P. Morgridge             Chairman of the Board and Director       June 4, 1999
- ------------------------------
John P. Morgridge

/s/ Donald T. Valentine           Vice Chairman and Director               June 4, 1999
- ------------------------------
Donald T. Valentine
</TABLE>


                                      II-3

<PAGE>   14

<TABLE>
<CAPTION>
SIGNATURES                                      TITLE                         DATE
- ----------                                      -----                         ----
<S>                               <C>                                      <C>

/s/ James F. Gibbons              Director                                 June 4, 1999
- ------------------------------
James F. Gibbons

/s/ Robert L. Puette              Director                                 June 4, 1999
- ------------------------------
Robert L. Puette

/s/ Masayoshi Son                 Director                                 June 4, 1999
- ------------------------------
Masayoshi Son

/s/ Steven M. West                Director                                 June 4, 1999
- ------------------------------
Steven M. West

/s/ Edward R. Kozel               Director                                 June 4, 1999
- ------------------------------
Edward R. Kozel

/s/ Carol A. Bartz                Director                                 June 4, 1999
- ------------------------------
Carol A. Bartz

/s/ James C. Morgan               Director                                 June 4, 1999
- ------------------------------
James C. Morgan

/s/ Mary Cirillo                  Director                                 June 4, 1999
- ------------------------------
Mary Cirillo

/s/ Arun Sarin                    Director                                 June 4, 1999
- ------------------------------
Arun Sarin
</TABLE>


                                      II-4

<PAGE>   15

                                INDEX TO EXHIBITS

<TABLE>
<CAPTION>
Exhibit
Number                                   Exhibit Title
- -------                                  -------------
<S>        <C>
  2.1      Agreement of Merger between Cisco Systems, Inc. and Fibex Systems.
  5.1      Opinion of Brobeck, Phleger & Harrison LLP
 23.1      Consent of PricewaterhouseCoopers LLP
 23.2      Consent of Brobeck, Phleger & Harrison LLP (included in the
           Opinion of BPH filed as Exhibit 5.1)
 24.1      Power of Attorney (included on page II-3 of this registration statement)
</TABLE>


                                      II-5


<PAGE>   1

                                                                     EXHIBIT 2.1

                               AGREEMENT OF MERGER

                                       OF

                               CISCO SYSTEMS, INC.

                                       AND

                                  FIBEX SYSTEMS


     This Agreement of Merger, dated as of the 17th day of May, 1999 ("Merger
Agreement"), between Cisco Systems, Inc., a California corporation ("Acquiror"),
and Fibex Systems, a California corporation ("Target").

                                    RECITALS

     A.   Target was incorporated in the State of California on March 10, 1997
and immediately prior to the merger will have outstanding 13,557,548 shares of
Common Stock ("Target Common Stock").

     B.   Acquiror and Target have entered into an Agreement and Plan of
Reorganization (the "Agreement and Plan of Reorganization") providing for
certain representations, warranties, covenants and agreements in connection with
the transactions contemplated hereby. This Merger Agreement and the Agreement
and Plan of Reorganization are intended to be construed together to effectuate
their purpose.

     C.   The Boards of Directors of Target and Acquiror deem it advisable and
in their mutual best interests and in the best interests of the shareholder of
Target, that Target be acquired by Acquiror through a merger ("Merger") of
Target with and into Acquiror.

     D.   The Boards of Directors of Acquiror and Target and the shareholders of
Target have approved the Merger.

                                   AGREEMENTS

     The parties hereto hereby agree as follows:

     1.   Target shall be merged with and into Acquiror, and Acquiror shall be
the surviving corporation.

     2.   The Merger shall become effective at such time (the "Effective Time")
as this Merger Agreement and the officers' certificate of Target is filed with
the Secretary of State of the State of California pursuant to Section 1103 of
the Corporations Code of the State of California.

     3.   At the Effective Time of the Merger (i) all shares of Target Common
Stock that are owned directly or indirectly by Target, Acquiror or any other
subsidiary of Acquiror shall be cancelled, and no securities of Acquiror or
other consideration shall be delivered in exchange therefor, (ii) each of the
issued and outstanding shares of Target Common Stock (other than shares, if any,
held by persons who have not voted such shares for approval of the Merger and
with respect to which such persons shall become entitled to exercise dissenters'
rights in accordance with the Corporations Code of the State of California,
referred to hereinafter as "Dissenting Shares") shall be converted automatically
into and exchanged for 0.197847369, of a share of Acquiror Common Stock;
provided, however, that no more than 2,867,384 shares of Common Stock of
Acquiror shall be issued in such exchange (including Acquiror Common Stock
reserved for issuance upon exercise of Target options assumed by Acquiror).
Those shares of Acquiror Common Stock to be issued as a result of the Merger are
referred to herein as the "Acquiror Shares".


                                      II-6

<PAGE>   2

     4.   Any Dissenting Shares shall not be converted into Acquiror Common
Stock but shall be converted into the right to receive such consideration as may
be determined to be due with respect to such Dissenting Shares pursuant to the
law of the State of California. If after the Effective Time any Dissenting
Shares shall lose their status as Dissenting Shares, then as of the occurrence
of the event which causes the loss of such status, such shares shall be
converted into Acquiror Common Stock in accordance with Section 3.

     5.   Notwithstanding any other term or provision hereof but subject to the
proviso in the second sentence of Section 3, no fractional shares of Acquiror
Common Stock shall be issued, but in lieu thereof each holder of shares of
Target Common Stock who would otherwise, but for rounding as provided herein, be
entitled to receive a fraction of a share of Acquiror Common Stock shall receive
from Acquiror an amount of cash equal to the per share market value of Acquiror
Common Stock (deemed to be $111.60) multiplied by the fraction of a share of
Acquiror Common Stock to which such holder would otherwise be entitled. The
fractional share interests of each Target shareholder shall be aggregated, so
that no Target shareholder shall receive cash in an amount greater than the
value of one full share of Acquiror Common Stock.

     6.   The conversion of Target Common Stock into Acquiror Common Stock as
provided by this Merger Agreement shall occur automatically at the Effective
Time of the Merger without action by the holders thereof. Each holder of Target
Common Stock shall thereupon be entitled to receive shares of Acquiror Common
Stock in accordance with the Agreement and Plan of Reorganization.

     7.   At the Effective Time of the Merger, the separate existence of Target
shall cease, and Acquiror shall succeed, without other transfer, to all of the
rights and properties of Target and shall be subject to all the debts and
liabilities thereof in the same manner as if Acquiror had itself incurred them.
All rights of creditors and all liens upon the property of each corporation
shall be preserved unimpaired, provided that such liens upon property of Target
shall be limited to the property affected thereby immediately prior to the
Effective Time of the Merger.

     8.   This Merger Agreement is intended as a plan of reorganization within
the meaning of Section 368 of the Internal Revenue Code of 1986, as amended.

     9.   (a)  The Amended and Restated Articles of Incorporation of Acquiror in
effect immediately prior to the Effective Time shall be the Amended and Restated
Articles of Incorporation of the Surviving Corporation unless and until
thereafter amended.

          (b)  The Bylaws of Acquiror in effect immediately prior to the
Effective Time shall be the Bylaws of the Surviving Corporation unless and until
amended or repealed as provided by applicable law, the Articles of Incorporation
of the Surviving Corporation and such Bylaws.

          (c)  The directors and officers of Acquiror immediately prior to the
Effective Time shall be the directors and officers of the Surviving Corporation.

     10.  (a) Notwithstanding the approval of this Merger Agreement by the
shareholders of Target, this Merger Agreement shall terminate forthwith in the
event that the Agreement and Plan of Reorganization shall be terminated as
therein provided.

          (b)  In the event of the termination of this Merger Agreement as
provided above, this Merger Agreement shall forthwith become void and there
shall be no liability on the part of Target or Acquiror or their respective
officers or directors, except as otherwise provided in the Agreement and Plan of
Reorganization.

          (c)  This Merger Agreement may be signed in one or more counterparts,
each of which shall be deemed an original and all of which shall constitute one
agreement.

          (d)  This Merger Agreement may be amended by the parties hereto any
time before or after approval hereof by the shareholders of Target, but, after
such approval, no amendments shall be made which by law require the further
approval of such shareholders without obtaining such approval. This Merger
Agreement may not be amended except by an instrument in writing signed on behalf
of each of the parties hereto.


                                      II-7

<PAGE>   3

     IN WITNESS WHEREOF, the parties have executed this Merger Agreement as of
the date first written above.


                                        ACQUIROR



                                        By:
                                           -------------------------------------
                                           John T. Chambers, President


                                        By:
                                           -------------------------------------
                                           Larry R. Carter, Secretary



                                        TARGET



                                        By:
                                           -------------------------------------
                                           Richard Hejmanowski, President


                                        By:
                                           -------------------------------------
                                           Ken Buckland, Secretary


                                      II-8


<PAGE>   1

                                                                     EXHIBIT 5.1

                   OPINION OF BROBECK, PHLEGER & HARRISON LLP


                                  June 4, 1999


Cisco Systems, Inc.
255 W. Tasman Drive
San Jose, California  95134

     Re:  Cisco Systems, Inc. Registration Statement on Form S-3 for Resale of
          2,682,295 Shares of Common Stock

Ladies and Gentlemen:

     We have acted as counsel to Cisco Systems, Inc., a California corporation
(the "Company"), in connection with the registration for resale of 2,682,295
shares of Common Stock (the "Shares"), as described in the Company's
Registration Statement on Form S-3 ("Registration Statement") filed with the
Securities and Exchange Commission under the Securities Act of 1933, as amended
(the "Act").

     This opinion is being furnished in accordance with the requirements of Item
16 of Form S-3 and Item 601(b)(5)(i) of Regulation S-K.

     We have reviewed the Company's charter documents, the corporate proceedings
taken by the Company in connection with the original issuance and sale of the
shares and a certificate of a Company officer regarding (among other things) the
Company's receipt of consideration upon the original issuance and sale of the
shares. Based on such review, we are of the opinion that the shares are duly
authorized, validly issued, fully paid and nonassessable.

     We consent to the filing of this opinion as Exhibit 5.1 to the Registration
Statement and to the reference to this firm under the caption "Legal Matters" in
the prospectus which is part of the Registration Statement. In giving this
consent, we do not thereby admit that we are within the category of persons
whose consent is required under Section 7 of the Act, the rules and regulations
of the Securities and Exchange Commission promulgated thereunder or Item 509 of
Regulation S-K.

     This opinion letter is rendered as of the date first written above and we
disclaim any obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinion expressed herein. Our opinion is expressly
limited to the matters set forth above and we render no opinion, whether by
implication or otherwise, as to any other matters relating to the Company or the
Shares.


                                        Very truly yours,


                                        BROBECK, PHLEGER & HARRISON LLP


                                      II-9


<PAGE>   1

                                                                    EXHIBIT 23.1


                       CONSENT OF INDEPENDENT ACCOUNTANTS


     We hereby consent to the incorporation by reference in this Registration
Statement on Form S-3 of Cisco Systems, Inc. for the registration of 2,682,295
shares of its common stock, of our report dated August 4, 1999, relating to the
financial statements which appear in the 1998 Annual Report to Shareholders of
Cisco Systems, Inc. ("Cisco") which is incorporated by reference in Cisco's
Annual Report on Form 10-K for the fiscal year ended July 25, 1998. We also
consent to the incorporation by reference or our report dated August 4, 1998
relating to the financial statement schedule, which appears in such Annual
Report on Form 10-K. We also consent to the reference to our firm under the
caption "Experts."


                                        PricewaterhouseCoopers LLP


San Jose, California
June 1, 1999


                                     II-11


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