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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 26, 2001



                               CISCO SYSTEMS, INC.
               (Exact name of registrant as specified in charter)



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

<S>                                                                                     <C>
170 WEST TASMAN DRIVE, SAN JOSE, CALIFORNIA                                                 95134-1706
 (Address of principal executive offices)                                                   (Zip Code)
</TABLE>


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

<PAGE>   2

ITEM 5. OTHER EVENTS

     On February 26, 2001, Cisco Systems, Inc. announced it has completed the
acquisition of ExiO Communications, Inc. of San Jose, California. A copy of the
press release issued by Cisco Systems, Inc. on February 26, 2001 concerning the
foregoing transaction is filed herewith as Exhibit 99.1 and is incorporated
herein by reference.


ITEM 7. FINANCIAL STATEMENTS, PRO FORMA FINANCIAL INFORMATION AND EXHIBITS

     (a)  Not applicable.

     (b)  Not applicable.

     (c)  Exhibits

          99.1 Press Release of Cisco Systems, Inc., dated February 16, 2001,
               announcing the completion of the acquisition of ExiO
               Communications, Inc.

<PAGE>   3

                                   SIGNATURES

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

                                        CISCO SYSTEMS, INC.

Dated: February 27, 2001                By: /s/ DANIEL SCHEINMAN
                                           ------------------------------------
                                           Daniel Scheinman, Senior Vice
                                           President, Legal and Governmental
                                           Affairs


<PAGE>   4


                                  EXHIBIT INDEX

<TABLE>
Exhibit
Number                          Description of Document
------
<S>                  <C>
99.1                 Press Release of Cisco Systems, Inc., dated February 26,
                     2001, announcing the completion of the acquisition by Cisco
                     Systems, Inc. of ExiO Communications, Inc.
</TABLE>


</TEXT>
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<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>f699768kex99-1.txt
<DESCRIPTION>EXHIBIT 99.1
<TEXT>

<PAGE>   1
                                                                    EXHIBIT 99.1

                                                                   PRESS RELEASE

PRESS CONTACT:                               INVESTOR RELATIONS CONTACT:
Robyn Jenkins                                Roberta DeTata
Cisco Systems, Inc.                          Cisco Systems, Inc.
(408) 853-9848                               (408) 527-6388
rojenkin@cisco.com                           redetata@cisco.com

INDUSTRY ANALYST RELATIONS CONTACT:
Dora Ferrell
Cisco Systems, Inc.
(408) 527-4202
dferrell@cisco.com


        CISCO SYSTEMS COMPLETES ACQUISITION OF EXIO COMMUNICATIONS, INC.

     SAN JOSE, Calif., Feb. 26, 2001 -- Cisco Systems, Inc., today announced it
has completed the acquisition of privately held ExiO Communications, Inc.

     On Dec. 14, 2000, Cisco announced a definitive agreement to acquire ExiO
Communications, Inc., a leading developer of in-building, wireless technologies
for corporate networks based on standard, Code Division Multiple Access (CDMA)
technologies. The acquisition enhances Cisco's New World strategy for addressing
the in-business wireless market requiring a solution based on next-generation
CDMA technologies. ExiO's wireless telephony solution builds on Cisco's existing
wireless technology that enables enterprise customers to add the convenience of
mobility to voice-over-IP (Internet Protocol) services. 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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