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Cisco's Patent Claim on VRRP and HSRP

This IPR disclosure was submitted by e-mail.

Sections I, II, and IV of "The Patent Disclosure and Licensing Declaration Template for Legacy" have been completed for this IPR disclosure. Additional information may be available in the original submission.

The text of the original IPR disclosure is available further down, and also here:

Update this IPR disclosure. Note: Updates to IPR disclosures must only be made by authorized representatives of the original submitters. Updates will automatically be forwarded to the current Patent Holder's Contact and to the Submitter of the original IPR disclosure.

Submitted Date: March 20, 1998

I. Patent Holder/Applicant ("Patent Holder")
Legal Name: Cisco
II. Patent Holder's Contact for License Application
Name: Martin McNealis
Title: IP Product Line Manager
III. IETF Document or Other Contribution to Which this IPR Disclosure Relates:
Internet-Draft:"Cisco Hot Standby Router Protocol (HSRP)"
Internet-Draft:"Virtual Router Redundancy Protocol"

The text of the original IPR declaration:

Late in 1997, Cisco wrote:

>>With reference to the recently published Internet draft:

       Title     : Virtual Router Redundancy Protocol                      
       Author(s) : S. Knight, D. Weaver, D. Whipple
       Filename  : draft-whipple-vrrp-00.txt
       Pages     : 14
       Date      : 11/26/1996

>>This message is to inform you that Cisco believes that this
>>proposed protocol may infringe Cisco's patent #5,473,599,
>>Standby Router Protocol. 

The original document has gone through a number of revisions and name
changes. When submitted by the vrrp WG for publication, a query was
sent to Cisco.

The following message was received on March 11:

We have done the evaluation and our response is the following:

Cisco believes that implementation of draft-ietf-vrrp-spec-05.txt will 
require a license to Cisco's patent #5,473,599. If this protocol is 
approved as an IETF standard, licenses will be available to any party on 
reasonable, nondiscriminatory terms for implentation of the protocol.

On March 20, 1998, the definitive statement from Cisco Systems was received:

From: Martin McNealis 

  The following statement is in response to recent requests for a
  clarification on Cisco Systems' position regarding both its Hot
  Standby Router Protocol (HSRP) and the Virtual Router Redundancy
  Protocol (VRRP) proposal:-

    In Cisco's assessment, the VRRP proposal does not represent
    any significantly different functionality from that available
    with HSRP and also implementation of 'draft-ietf-vrrp-spec-06.txt'
    would likely infringe on Cisco's patent #5,473,599.

    When Cisco originally learned of the VRRP proposal, the Hot
    Standby Router Protocol was then promptly offered for
    standardization with the understanding that, if approved,
    licenses for HSRP would be made available on reasonable,
    nondiscriminatory terms for implementation of the protocol.
    This offer stands for the adoption and implementation of

    However, now that the 'draft-li-hsrp-01.txt' submission is
    approaching expiration and the Working Group is continuing with
    the VRRP proposal, Cisco Systems reserves the right to protect
    its intellectual property. Furthermore, Cisco takes the position
    that standardizing on another proposal that so closely mirrors
    an existing, well established, extensively deployed protocol
    is out of step with the principles and practices embodied in the
    IETF and would thus represent cause for concern within the

    Martin McNealis
    IP Product Line Manager