CISCO SYSTEMS INC
S-3/A, EX-5.1, 2001-01-03
COMPUTER COMMUNICATIONS EQUIPMENT
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<PAGE>   1

                                                                     EXHIBIT 5.1


                   OPINION OF BROBECK, PHLEGER & HARRISON LLP


                                January 3, 2001

Cisco Systems, Inc.
170 West Tasman Drive
San Jose, California  95134

     Re:  Cisco Systems, Inc. Registration  Statement on Form S-3 for
          Resale of 2,896,706 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 2,896,706
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,

                                        /s/ BROBECK, PHLEGER & HARRISON LLP
                                        -----------------------------------
                                        BROBECK, PHLEGER & HARRISON LLP



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