A virtual router is a logical entity managed by VRRP that acts as a default router for hosts on a
shared LAN. It consists of a Virtual Router Identifier (VRID) and a set of associated IP addresses
(or address) across a common LAN. A VRRP router can backup one or more virtual routers.

The purpose of supporting multiple IP addresses within a single virtual router is for multi-netting.
This is a common mechanism that allows multiple local subnet attachment on a single routing
interface. Up to four virtual routers are possible on a single Alcatel-Lucent IP interface. The virtual
routers must be in the same subnet. Each virtual router has its own VRID, state machine and
messaging instance.

IP Address Owner

VRRP can be configured in either an owner or non-owner mode. The owner is the VRRP router
whose virtual router IP address is the same as the real interface IP address. This is the router that
responds to packets addressed to one of the IP addresses for ICMP pings, TCP connections, etc.
All other virtual router instances participating in this message domain must have the same VRID
configured and cannot be configured as owner.

7750 SR OS allows the virtual routers to be configured as non-owners of the IP address. VRRP on
a 7750 SR router can be configured to allow non-owners to respond to ICMP echo requests when
they become the virtual router master for the virtual router. Telnet and other connection-oriented
protocols can also be configured for non-owner master response. However, the individual
application conversations (connections) will not survive a VRRP failover. A non-owner VRRP
router operating as a backup will not respond to any packets addressed to any of the virtual router
IP addresses.

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