
4 Virtual Router Redundancy Protocol (VRRP)
This chapter describes the Nokia IPSO implementation of VRRP and how to configure it on your system.
VRRP Overview
Virtual Router Redundancy Protocol (VRRP) provides dynamic failover of IP addresses from one router to another in the event of failure. VRRP is defined in RFC 3768. The Nokia implementation of VRRP includes all of the features described in RFC 3768, plus the additional feature of monitored circuit, described below.
Nokia supports VRRP for IPv6. For more information about the Nokia implementation and how to configure VRRP for IPv6 interfaces, see “Configuring VRRP for IPv6.”
VRRP allows you to provide alternate router paths for end hosts that are configured with static default routes. Using static default routes minimizes configuration and processing overhead on end hosts. When end hosts are configured with static routes, normally the failure of the master router results in a catastrophic event, isolating all hosts that are unable to detect available alternate paths to their gateway. You can implement VRRP to provide a higher availability default path to the gateway without needing to configure dynamic routing or router discovery protocols on every end host.
How VRRP Works
VRRP uses a virtual router to allow end hosts to use an IP address that is part of the virtual router as the default
A virtual router, or VRID, consists of a master platform and one or more backups. The master sends periodic VRRP advertisements (also known as hello messages). To minimize network traffic, backups do not send VRRP advertisements.
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