"By default, a preemptive scheme is enabled whereby a higher priority virtual router backup that becomes available takes over for the virtual router backup that was elected to become virtual router master. You can disable this preemptive scheme using the no vrrp preempt command. If preemption is disabled, the virtual router backup that is elected to become virtual router master remains the master until the original virtual router master recovers and becomes master again."
VRRP has the concept of owner that is the router that has on the interface the same ip address as the VRRP VIP.
Without an owner on LAN the VRRP process is stucked in an idle state.
VRRP preemption or VRRP no preemption applies to the other nodes: in any case when the owner comes back (or restores its priority) takes over.
The effect VRRP preemption disable should have is that of avoiding that a third device can take over on the second node (the one that took the role of active) during the time owner is not the active node.
In the same document you have linked the preemption is described as:
The redundancy scheme of VRRP enables you to preempt a virtual router backup that has taken over for a failing virtual router master with a higher priority virtual router backup that has become available.
That is in line with my understanding.
So if you mean the original master of the group it should retake its role regardless of preemption configuration.
Again I didn't test this recently but it looks like VRRP treats differently the original master of the group.
If you have made tests that demonstrate a different behaviour it can be correct/acceptable.
And VRRP defaults to preemption enabled in all IOS versions.
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