Here is the official answer:
The standby router automatically assumes the role when the active router
fails or is removed from service. This new active router remains the
forwarding router even when the former active router with the higher
priority regains the service in the network.
The former active router can be configured to resume the forwarding router
role from a router with a lower priority. To make the router resume the
forwarding role, you must enter the PREEMPT COMMAND this will make the
former router assume its previous role. I hope this make sense.
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