PDT is greater than or equal to the master down time (3 times the advertisement interval)

  1. An owner VR after reboot—waits for the master down time. If the owner router does not receive a packet during this time, it becomes the master. If it receives a VRRP advertisement from its peer during this time, it waits until the expiration of the preempt delay time before becoming the master.

  2. A backup VR after reboot—waits for the master down time. If the backup router does not receive a packet during this time, it becomes the master. If it receives a VRRP advertisement from its peer during this time, and it has a higher priority value than this peer, it waits until the expiration of the preempt delay time before becoming the backup.