Editing Virtual Router Redundancy Protocol (section)

==History==
Work on VRRP started in 1997 with a first draft published by the [[Internet Engineering Task Force]] (IETF). In 1998, the protocol was officially defined.{{Ref RFC|2338}}
VRRP is an open standard, but [[Cisco]] claimed that their [[Hot Standby Router Protocol]], a similar but [[proprietary]] protocol with essentially the same facility, is patented and licensed.<ref>[https://web.archive.org/web/20100805130809/http://www.ietf.org/ietf-ftp/IPR/VRRP-CISCO IETF source]</ref>
However, in 2001, in reply to a direct request, Robert Barr of Cisco replied that they will not assert any patent claims unless someone tried to assert a claim against Cisco.<ref name="barr2001">{{cite web
 |url=http://lists.graemef.net/pipermail/lvs-users/2001-November/028982.html
 |title=[VRRP & OpenSource] Cisco answer
 |date=2001-11-30
 |access-date=2013-11-28
 |author=Alexandre Cassen
 |publisher=LVS mailing list
 |quote=Robert Barr, from CISCO Systems: Cisco will not assert any patent claims against anyone for an implementation of IETF standard for VRRP unless a patent claim is asserted against Cisco, in which event Cisco reserves the right to assert patent claims defensively.}}</ref> [[IBM]] also claims covering patents and their statement is readable on the IETF webpage.<ref name="IBM-statement">{{cite web
 |url=http://ietf.org/ietf/IPR/ibm-rfc2338-rfc2787.txt
 |title=IBM Patent Disclosure and Licensing Statement Regarding IETF RFC 2338
 |date=2003-04-15
 |access-date=2013-11-28
 |author=Chuck Adams, IBM
 |publisher=IETF}}</ref> All patents in question have expired.<ref>{{Cite patent|number=US6148410A|title=Fault tolerant recoverable TCP/IP connection router|gdate=2000-11-14|invent1=Baskey|invent2=Dillenberger|invent3=Goldszmidt|invent4=Hunt|inventor1-first=Michael Edward|inventor2-first=Donna Ngar-Ting|inventor3-first=German Sergio|inventor4-first=Guerney Douglass Holloway|url=https://patents.google.com/patent/US6148410A/en}}</ref><ref>{{Cite patent|number=US5371852A|title=Method and apparatus for making a cluster of computers appear as a single host on a network|gdate=1994-12-06|invent1=Attanasio|invent2=Smith|inventor1-first=Clement R.|inventor2-first=Stephen E.|url=https://patents.google.com/patent/US5371852A/en}}</ref>

The protocol was refined in 2004 as version 2.{{Ref RFC|3768}} VRRP version 3, the current version, was published in 2010.{{Ref RFC|5798}}