Timer Enhancements to Reduce Failover Times for the Virtual Router Redundancy Protocol for IPv4

Document Type Expired Internet-Draft (vrrp WG)
Author Robert Hott 
Last updated 2006-03-13 (latest revision 2005-12-13)
Stream Internet Engineering Task Force (IETF)
Expired & archived
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Stream WG state WG Document
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IESG IESG state Expired
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


The router survivability capability provided by the Virtual Router Redundancy Protocol for IPv4 (VRRPv4) satisfies the requirements for many LAN environments. There are, however, LAN environments that have sub-second failover requirements and thus a need for finer granularity of the VRRP timers. This draft proposes extensions to VRRPv4 [RFC 3768] for specifying sub-second Advertisement Intervals. A new message type is introduced which permits the timer granularity for the Advertisement Interval to be specified. In addition, a new field is introduced permitting the specification of the number of missed ADVERTISEMENTs before a Virtual Router Master is declared down.


Robert Hott (robert.hott@navy.mil)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)