VRRP Overview
370 Router Configuration Guide
VRRP Overview
The Virtual Router Redundancy Protocol (VRRP) for IPv4 is defined in the IETF RFC 3768,
Virtual Router Redundancy Protocol. VRRP for IPv6 is specified in draft-ietf-vrrp-unified-
spec-02.txt and only applies to the 7750 SR and 7950 XRS. 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. When this IP
interface is specified as a default gateway on hosts directly attached to this LAN, the routers
sharing the IP interface prevent a single point of failure by limiting access to this gateway
address. VRRP can be implemented on IES service interfaces and on core network IP
interfaces.
If the master virtual router fails, the backup router configured with the highest acceptable
priority becomes the master virtual router. The new master router assumes the normal packet
forwarding for the local hosts.
Figure 13 displays an example of a VRRP configuration.
Figure 13: VRRP Configuration
VRRP Components
VRRP consists of the following components:
OSRG006
Non-Owner
ALA-3
vrld 100
Priority 150
Owner
ALA-2
vrld 100
Non-Owner
ALA-1
vrld 100
Priority 200
Internet
Backup Master Backup
Virtual
Router ID
(VRID)
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