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                    PROSPECTUS SUPPLEMENT DATED JUNE 28, 1999
                        (TO PROSPECTUS DATED MAY 6, 1998)

                                                               Filed Pursuant to
                                                          Rule 424(b)(3) and (c)
                                                  Commission File No.  333-51487

                                   652 SHARES



                                  COMMON STOCK

     This Prospectus Supplement supplements the Prospectus dated May 6, 1998
(the "Prospectus") of Cisco Systems, Inc. ("Cisco" or the "Company") relating to
the public offering, which is not being underwritten, and sale by certain
shareholders of the Company or by pledgees, donees, transferees or other
successors in interest that receive such shares as a gift, partnership
distribution or other non-sale related transfer (the "Selling Shareholders") of
up to 652 shares of Cisco's Common Stock, par value $0.001 per share (the
"Common Stock"), who received such shares in connection with the acquisition by
statutory merger of NetSpeed, Inc. ("NetSpeed"), by and through a merger of
NetSpeed with and into the Company. This Prospectus Supplement should be read in
conjunction with the Prospectus, and this Prospectus Supplement is qualified by
reference to the Prospectus except to the extent that information herein
contained supersedes the information contained in the Prospectus. Capitalized
terms used in this Prospectus Supplement and not otherwise defined herein have
the meanings specified in the Prospectus.



                              SELLING SHAREHOLDERS

     In June 1999, Richard E. Anderson ("Anderson") donated 652 shares of Common
Stock to the Southern Methodist University (the "University"), which donee was
not specifically named in the Prospectus. The following table provides certain
information with respect to the number of shares of Common Stock beneficially
owned by a shareholder of the Company who was not specifically identified in the
Prospectus as a Selling Shareholder, the percentage of outstanding shares of
Common Stock of the Company this represents and the number of shares of Common
Stock to be registered for sale hereby. Footnote 6 to the table of Selling
Shareholders in the Prospectus is hereby amended to include the Univeristy as a
Selling Shareholder.



                                           Number of                                  Number of
                                            Shares              Percent of              Shares
                                          Beneficially          Outstanding         Registered for
Name of Selling Shareholder                 Owned                 Shares            Sale Hereby(1)
- ----------------------------------------------------------------------------------------------------
                                                                                
Southern Methodist University                652                    *                    652


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

*    Represents beneficial ownership of less than 1%.

(1)  The registration statement to which the Prospectus and this Prospectus
     Supplement relate shall also cover any additional shares of Common Stock
     which become issuable in connection with the Shares registered for sale
     hereby by reason of any stock dividend, stock split, recapitalization or
     other similar transaction effected without the receipt of consideration
     which results in an increase in the number of the Company's outstanding
     shares of Common Stock.