Vrrp Overview; Figure 7 Vrrp Configuration - Alcatel-Lucent 7705 Configuration Manual

VRRP Overview

VRRP Overview
VRRP describes a method of implementing a redundant IP interface shared between two or
more routers on a common LAN segment, allowing a group of routers to function as one
virtual router. With VRRP, one router is designated as the virtual router master and the other
routers in the group act as backups. If the IP interface of the virtual router is specified as a
default gateway on hosts directly attached to the LAN, then the routers sharing the IP
interface by participating in VRRP as part of the virtual router instance, will prevent a single
point of failure by assuring access to this gateway address. VRRP can be implemented on IES
and VPRN service interfaces.
The virtual router master forwards all packets sent to the virtual IP address. If the virtual
router master fails, an election process begins and the backup router configured with the
highest acceptable priority becomes the elected virtual router master. The new master router
assumes the normal packet forwarding for the local hosts.
Figure 7
212
displays an example of a VRRP configuration.
Figure 7: VRRP Configuration
Backup
Non-Owner
ALU-1
VRID 100
Priority 200
Internet
or Private
Network
Master
Owner
ALU-2
VRID 100
Priority 255
Hosts
7705 SAR OS Router Configuration Guide
Backup
Non-Owner
ALU-3
VRID 100
Priority 150
Virtual Router ID
(VRID)
23231