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<PAGE>   1

                                  UNITED STATES
                       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 15, 2001
                                                         -----------------


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

<TABLE>
<S>                                   <C>                    <C>
         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)
</TABLE>

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




ITEM 5. OTHER EVENTS

     On February 15, 2001, Cisco Systems, Inc. (the "Registrant") announced it
has completed the acquisition of Active Voice Corporation of Seattle,
Washington. A copy of the press release issued by the Registrant on February 15,
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

<TABLE>
<S>            <C>
          99.1 Press Release of Registrant, dated February 15, 2001, announcing
               the completion of the acquisition by Registrant of Active Voice
               Corporation.
</TABLE>
<PAGE>   2

                                   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 20, 2001               By: /s/ Daniel Scheinman
                                           -------------------------------
                                           Daniel Scheinman
                                           Senior Vice President,
                                           Legal and Government Affairs

                                       2

<PAGE>   3


                                  EXHIBIT INDEX
<TABLE>
<CAPTION>
Exhibit
Number                        Description of Document
-------                       -----------------------
<S>            <C>
99.1           Press Release of Registrant, dated February 15, 2001, announcing
               the completion of the acquisition by Registrant of Active Voice
               Corporation.
</TABLE>

                                       3

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>f69814orex99-1.txt
<DESCRIPTION>EXHIBIT 99.1
<TEXT>

<PAGE>   1

                                                                    EXHIBIT 99.1

CISCO SYSTEMS COMPLETES ACQUISITION OF ACTIVE VOICE CORPORATION

SAN JOSE, Calif., February 15, 2001 -- Cisco Systems, Inc. today announced it
has completed the acquisition of publicly held Active Voice Corporation of
Seattle, Washington. The acquisition of Active Voice supports Cisco's vision to
deliver unified communications and a single, end-to-end IP network combining
data, voice and video for the corporate enterprise.

On Nov. 10, 2000, Cisco announced a definitive agreement to acquire Active
Voice, a leading provider of Internet Protocol (IP)-based unified communication
solutions for the enterprise. Cisco paid approximately $266 million in stock for
Active Voice's Unity(TM) operation, comprised of IP-based unified communication
solutions. Additionally, Cisco paid approximately $30 million in stock to Active
Voice shareholders for Active Voice's circuit switched PBX voicemail solutions
business, which was immediately sold by Cisco for $30 million to a newly formed
private company. This business will continue to operate under the name "Active
Voice, Inc." and will be comprised of a group of former employees of Active
Voice Corporation.

As a result of the acquisition, each share of common stock of Active Voice
Corporation will be converted to 0.57960 of a share of Cisco common stock, and
Active Voice stock options will be converted to Cisco stock options on the same
basis. The acquisition is being accounted for using purchase accounting.

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.

MORE INFORMATION

PRESS CONTACT:
Robyn Jenkins
Cisco Systems, Inc.
(408) 853-9848
rojenkin@cisco.com

INVESTOR RELATIONS CONTACT:
Roberta Detata
Cisco Systems, Inc.
(408) 527-6388
rdetata@cisco.com

INDUSTRY ANALYST RELATIONS CONTACT:
Art Rangel
Cisco Systems, Inc.
(408) 853-5705
arangel@cisco.com
</TEXT>
</DOCUMENT>
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