Multicast and Routing Guide K/KA/KB.15.15

• 512 VRRPv2 and VRRPv3 sessions, in any mix
• 32 IP addresses per VR
• Each VR uses one MAC address as described under “Virtual router MAC address” (page 278).
• If an IP address is deleted on a VLAN interface, one of the following occurs:
VR owner: If the VR uses the same IP address as a VIP, that IP address is deleted from the
VR.
•
• VR backup: If the VR has a VIP in the same subnet as that of the deleted IP address, that
VIP will be deleted from the VR.
If the deleted VIP was the last VIP of an active VR, the VR will be deactivated. (For more on
multiple, VIPs on a VR, see “Associating more than one VIP with a VR” (page 283).
• The VRRP backup router can respond to ping requests when the virtual-ip-ping feature
is enabled. For more information, see “Pinging the virtual IP of a backup router” (page 285).
Steps for provisioning VRRP operation
Basic configuration process
This process assumes the following for VRRP operation:
• VLANs on the selected routers are already configured and IP-enabled.
• IP routing (IPv4) or IPv6 unicast-routing (IPv6) is enabled.
• The network topology allows multiple paths for routed traffic between edge devices.
1. Configure the owner for VRRP operation and a VR instance.
a. On the router intended as the owner for a particular network or subnet, enter the global
configuration context and enable VRRP:
router vrrp ipv4 enableor router vrrp ipv6 enable
b. Enter the desired VLAN context and configure a VR instance:
vlan vid
vrrp vrid 1 - 255 (for IPv4)
vrrp ipv6 vrid 1-255 (for IPv6)
This step places the CLI in the context of the specified VR.
c. Configure the router's real IP address for the current VLAN interface as the VIP for the VR
instance.
virtual-ip-address ipaddr
d. Activate the owner VR instance:
enable
e. Inspect the configuration for the owner VR:
show vrrp vlan vid vrid vrid-# config (IPv4)
show vrrp ipv6 vlan vid vrid vrid-# config (IPv6)
Leave the owner's advertisement interval at its default (1 second).
2. Configure a backup for the same VR instance as for the owner in step 1 (page 280).
280 Virtual Router Redundancy Protocol (VRRP)