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<PAGE>   1

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                        Securities Exchange Act of 1934

       Date of Report (date of earliest event reported: February 5, 2001



                              CISCO SYSTEMS, INC.

               (Exact name of registrant as specified in charter)




         CALIFORNIA                    0-18225                 77-0059951
(State or other jurisdiction         (Commission             (IRS Employer
      of incorporation)              File Number)          Identification No.)


170 WEST TASMAN DRIVE, SAN JOSE, CALIFORNIA                      95134-1706
 (Address of principal executive offices)                        (Zip Code)




Registrant's telephone number, including area code: (408) 526-4000

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

<PAGE>   2

ITEM 5.   OTHER EVENTS

          On February 5, 2001, Cisco Systems, Inc. (the "Registrant") announced
it has completed the acquisition of Radiata, Inc. of Delaware. A copy of the
press release issued by the Registrant on February 5, 2001 concerning the
foregoing transaction is filed herewith as Exhibit 99.1 and is incorporated
herein by reference.



<PAGE>   3

                                   SIGNATURES

          Pursuant to the requirements of the Securities Exchange Act of 1934,
as amended, the Registrant has duly caused this report to be signed on its
behalf by the undersigned hereunto duly authorized.

                                         CISCO SYSTEMS, INC.

Dated: February 7, 2001                  By: /s/ DANIEL SCHEINMAN
                                         ---------------------------------------
                                         Daniel Scheinman, Senior Vice President
                                         Legal and Government Affairs



<PAGE>   4

                                 EXHIBIT INDEX


<TABLE>
<CAPTION>
Exhibit
Number                        Description of Document
-------                       -----------------------
<S>            <C>
99.1           Press Release of Registrant, dated February 5, 2001, announcing
               the completion of the acquisition by Registrant of Radiata Inc.
</TABLE>
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<DESCRIPTION>EXHIBIT 99.1
<TEXT>

<PAGE>   1

PRESS CONTACT:                                       INVESTOR RELATIONS CONTACT:

Robyn Jenkins                                        Blair Christie
Cisco Systems, Inc.                                  Cisco Systems, Inc.
(408) 853-9848                                       (408) 525-4856
rojenkin@cisco.com                                   blchrist@cisco.com

INDUSTRY ANALYST RELATIONS CONTACT:

Art Rangel
Cisco Systems, Inc.
(408) 853-5705
arangel@cisco.com


              CISCO SYSTEMS COMPLETES ACQUISITION OF RADIATA, INC.

     SAN JOSE, Calif., Feb. 5, 2001 -- Cisco Systems, Inc., today announced it
has completed the acquisition of privately held Radiata, Inc.

     On Nov. 13, 2000, Cisco announced a definitive agreement to acquire
Radiata, Inc., a leading supplier of chipsets for high-speed wireless networks.
The acquisition strengthens Cisco's New World strategy by expanding its ability
to deliver next generation wireless networks. This acquisition is being
accounted for as a purchase.

ABOUT CISCO SYSTEMS

     Cisco Systems, Inc. (NASDAQ: CSCO) is the worldwide leader in networking
for the Internet. News and information are available at www.cisco.com.

                                      # # #

Cisco, Cisco Systems, and the Cisco Systems logo are registered trademarks of
Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other
countries. All other trademarks mentioned in this document are the property of
their respective owners.
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