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VRRP Overview
This chapter explains how to set up and monitor the Virtual Router Redundancy Protocol
(VRRP) on the Internet Appliance (IA). VRRP is defined in RFC 2338.
En- host systems on a LAN are often configured to send packets to a statically configured
default router. If this default router becomes unavailable, all the hosts that use it as their
first hop router become isolated on the network. VRRP provides a way to ensure the
availability of an end host's default router.
This is done by assigning IP addresses that end hosts use as their default route to a virtual
router. A Master router is assigned to forward traffic designated for the virtual router. If
the Master router becomes unavailable, a Backup router takes over and begins forwarding
traffic for the virtual router. As long as one of the routers in a VRRP configuration is up,
the IP addresses assigned to the virtual router are always available and the end hosts can
send packets to these IP addresses without interruption.
Internet Appliance User Reference Manual
Chapter 5
Configuration
VRRP
Guide
63
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