One active master switch exists for each IP subnet. All other VRRP interfaces in a network are in backup mode.
If you have VRRP and IP routing protocols configured on the same IP physical interface, you cannot select the interface address as the VRRP virtual IP address (logical IP address). Use a separate dedicated IP address for VRRP.
To modify the behavior of the VRRP failover mechanism, use the hold-down timer to allow the router enough time to detect and update routes. The timer delays the preemption of the master over the backup, when the master becomes available. The hold-down timer has a default value of 0 seconds. Configure all of your routers to the identical number of seconds for the hold-down timer. In addition, you can manually force the preemption of the master over the backup before the delay timer expires.
Note
The VRRP virtual IP address cannot be the same as the local IP address of the port or VLAN on which VRRP is enabled.
Important
The switch, when it acts as a VRRP master, does not reply to Simple Network Management Protocol (SNMP) Get requests to the VRRP virtual interface address. However, if the switch acts as a VRRP master, and receives SNMP Get requests to its physical IP address, then it does respond.
The Simple Network Management Protocol (SNMP) provides facilities to manage and monitor network resources. An SNMP manager and agent communicate through the SNMP protocol. The manager sends queries and the agent responds. An SNMP Get request is a message that requests the values of one or more objects.
Note
The VRRP IP address responds only to ICMP-based traceroute requests. It does not respond to UDP-based traceroute requests.
Assign an IP address to the interface.
Enable VRRP globally.