Alcatel-Lucent 7450 - Virtual Router; IP Address Owner

VRRP
Router Configuration Guide 371
• Virtual Router
• IP Address Owner
• Primary and Secondary IP Addresses
• Virtual Router Master
• Virtual Router Backup
• Owner and Non-Owner VRRP
Virtual Router
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.
Alcatel-Lucent routers allow the virtual routers to be configured as non-owners of the IP
address. VRRP on a 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.