Internet Engineering Task Force (IETF) S. Nadas, Ed.
Request for Comments: 5798 Ericsson
Obsoletes: 3768 March 2010
Category: Standards Track
ISSN: 2070-1721
Virtual Router Redundancy Protocol (VRRP) Version 3 for IPv4 and IPv6
Abstract
This memo defines the Virtual Router Redundancy Protocol (VRRP) for
IPv4 and IPv6. It is version three (3) of the protocol, and it is
based on VRRP (version 2) for IPv4 that is defined in RFC 3768 and in
"Virtual Router Redundancy Protocol for IPv6". VRRP specifies an
election protocol that dynamically assigns responsibility for a
virtual router to one of the VRRP routers on a LAN. The VRRP router
controlling the IPv4 or IPv6 address(es) associated with a virtual
router is called the Master, and it forwards packets sent to these
IPv4 or IPv6 addresses. VRRP Master routers are configured with
virtual IPv4 or IPv6 addresses, and VRRP Backup routers infer the
address family of the virtual addresses being carried based on the
transport protocol. Within a VRRP router, the virtual routers in
each of the IPv4 and IPv6 address families are a domain unto
themselves and do not overlap. The election process provides dynamic
failover in the forwarding responsibility should the Master become
unavailable. For IPv4, the advantage gained from using VRRP is a
higher-availability default path without requiring configuration of
dynamic routing or router discovery protocols on every end-host. For
IPv6, the advantage gained from using VRRP for IPv6 is a quicker
switchover to Backup routers than can be obtained with standard IPv6
Neighbor Discovery mechanisms.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc5798.
Nadas Standards Track [Page 1]
RFC 5798 VRRPv3 for IPv4 and IPv6 March 2010
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Table of Contents
1. Introduction ....................................................4
1.1. A Note on Terminology ......................................4
1.2. IPv4 .......................................................5
1.3. IPv6 .......................................................6
1.4. Requirements Language ......................................6
1.5. Scope ......................................................7
1.6. Definitions ................................................7
2. Required Features ...............................................8
2.1. IPvX Address Backup ........................................8
2.2. Preferred Path Indication ..................................8
2.3. Minimization of Unnecessary Service Disruptions ............9
2.4. Efficient Operation over Extended LANs .....................9
2.5. Sub-Second Operation for IPv4 and IPv6 .....................9
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