To modify the behavior of the VRRP failover mechanism, use the holddown timer to enable the router enough time to detect and update routes. The timer delays preempting VRRP primary over the backup, when the primary becomes available.
The transition of virtual router to Master state is delayed in the following conditions:
The VRRP holddown timer runs only when the VRRP virtual router transitions from initialization to backup to master. This occurs only on a system startup.
The VRRP holddown timer does not run if the amount of time passed since VRRP virtual router initialization is greater than preset holddown time. In such a case, VRRP virtual router transitions to Master happens irrespective of the holddown timer.
The VRRP holddown timer also applies to the VRRP BackupMaster feature.