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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):    AUGUST 23, 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.)


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 August 23, 2001, Cisco Systems, Inc. (the "Registrant") announced its
has completed the acquisition of AuroraNetics, Inc. of San Jose, California.
Attached as Exhibit 99.1 and incorporated herein by reference is a copy of the
press release announcing the completion of the acquisition.


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

     (c)  Exhibits.

          99.1 Press Release, dated August 23, 2001, announcing the Registrant's
               acquisition of AuroraNetics, Inc.

<PAGE>   3


                                   SIGNATURES

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

                                CISCO SYSTEMS, INC.

Dated: August 24, 2001          By: /s/ MICHELANGELO VOLPI
                                   ---------------------------------------------
                                   Michelangelo Volpi
                                   Senior Vice President, Chief Strategy Officer
<PAGE>   4


                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
Exhibit
Number                                       Description of Document
------                                       ------------------------
<S>                  <C>
99.1                 Press Release, dated August 23, 2001, announcing the Registrant's acquisition of AuroraNetics,
                     Inc.
</TABLE>

</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>3
<FILENAME>f75400ex99-1.txt
<DESCRIPTION>EXHIBIT 99.1
<TEXT>
<PAGE>   1



                                                                    EXHIBIT 99.1

                                                                   PRESS RELEASE

CISCO SYSTEMS COMPLETES ACQUISITION OF AURORANETICS

SAN JOSE, Calif., Aug. 23, 2001-- Cisco Systems, Inc., today announced it has
completed the acquisition of privately held AuroraNetics, Inc. of San Jose,
California. AuroraNetics is a developer of 10 Gigabits per second (Gbps) silicon
technology for metropolitan fiber networks.

On July 11, 2001, Cisco announced a definitive agreement to acquire
AuroraNetics. AuroraNetics' silicon technology is used in data-optimized fiber
rings known as Resilient Packet Rings (RPR). The acquisition of AuroraNetics
complements Cisco's existing RPR-based products (known as Dynamic Packet
Transport) by enabling the technology to scale from the current 2.5Gbps up to
10Gbps. This acquisition is being accounted for as a purchase.

ABOUT CISCO SYSTEMS

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


                                      # # #

Cisco, Cisco Systems, PIX, IOS and the Cisco Systems logo are registered
trademarks of Cisco Systems, Inc. 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. The use of the word partner does not imply
a partnership relationship between Cisco and any other company. (0005R)

CONTACT INFORMATION

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

INVESTOR RELATIONS CONTACT(S):
Blaire Christie
Cisco Systems, Inc.
408 525-4856
blchrist@cisco.com

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

</TEXT>
</DOCUMENT>
</SUBMISSION>
