Virtual IP address (VIP)

The VIP associated with a VR must be a real IP address already configured in the associated VLAN interface on the owner router in the VR. If the VIP is an IPv6 address, a link-local address must be configured before adding a global IPv6 address. Also, the owner and all other (backup) routers belonging to the VR have this IP address configured in their VRID contexts as the VIP. In Figure 37: Example of using VRRP to provide redundant network access, is a real IP address configured on VLAN 100 in Router 1 and is the VIP associated with VR 1.

If the configured owner in a VR becomes unavailable, it is no longer the master for the VR and a backup router in the VR is elected to assume the role of master, as described under Backup router.

A subnetted VLAN allows multiple VIPs. However, if there are 32 or fewer IP addresses in a VLAN interface, and you want VRRP support on multiple subnets, the recommended approach is to configure a separate VR instance for each IP address in the VLAN. In cases where VRRP support is needed for more than 32 IP addresses in the same VLAN.