System information

Configuring VRRP
13-1
Overview
This chapter describes how to configure the Virtual Router Redundancy Protocol
(VRRP) for the BSR 64000™ system using the command line interface (CLI). For
further information on the CLI commands described in this chapter, refer to the BSR
64000 Command Reference Guide. This chapter discusses the following topics:
• About VRRP
• Initial VRRP Tasks
• Managing VRRP on the BSR
• Gathering Virtual Router Information
About VRRP
VRRP dynamically assigns responsibility for one or more virtual routers to VRRP
routers on a LAN. This allows several routers on a multiaccess link to use the same
virtual IP address. A VRRP router runs the VRRP protocol in conjunction with one or
more other routers attached to a LAN. One router is elected master; the others act as
backups in case the master router fails. The election process provides dynamic
fail-over in the forwarding responsibility if the master becomes unavailable. This
allows any of the virtual router IP addresses on the LAN to be used as the default
first-hop router by end-hosts. VRRP provides a higher-availability default path
without requiring configuration of dynamic routing or router discovery protocols on
every end host.
Initial VRRP Tasks
You must complete the following tasks to configure VRRP on the BSR:
Note: If you configure a virtual IP on a router with the same IP on a physical
interface, then it is assigned a priority of 255 and will always be master
unless it fails.