Use this command to configure preempt mode. If set to true, the highest priority backup is always the master when the default master is unavailable. If set to false, a higher priority backup does not preempt a lower priority backup which is acting as master.

When the master router fails, the backup routers come online in priority order — highest to lowest. Preempt mode set to true allows a higher priority backup router to relieve a lower priority backup.

By default, a preemptive scheme is enabled whereby a higher priority backup virtual router that becomes available takes over for the backup virtual router that was elected to become master virtual router. This preemptive scheme can be disabled using the preempt-mode false command. If preemption is disabled, the backup virtual router that is currently elected as Master does not transition to backup again when the alternate backup router with higher priority becomes available.

By default, preempt mode is true

Router mode

This command was introduced before OcNOS version 1.3.

The example below shows how to enable the preempt mode.