VRRP (Virtual Router Redundancy Protocol) master preemption is a feature that allows a VRRP backup router with a higher VRRP priority to take control from a lower priority backup that is acting as the master.
Note
The VRRP router IP address owner always preempts, independent of the VRRP preemption setting.If the preempt delay timer is configured for between 1 and 3600 seconds and the lower-priority master is still operating, the router preempts the master when the timer expires.
If the preempt delay timer is configured for 0, the router preempts the master after three times length of the hello interval.
If the higher priority router stops receiving advertisements from the current master for three times the length of the hello interval, it takes over mastership immediately.
The preempt delay timer provides time for a recovering router to complete start up before preempting a lower-priority router. If the preempt delay timer is configured too low, traffic is lost between the time the preempting router takes control and the time when it has completed startup.
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