VRRP-E slow start timer
In a VRRP extended (VRRP-E) configuration, if a master device goes offline, the backup
router with the highest priority takes over after the expiration of the dead interval
timer. When the original master device is back online, you can configure a slow-start
timer interval that extends the time interval beyond the dead interval before the
original master device transitions back to the role of master device.
The slow-start interval allows additional time for routing protocols, for example OSPF, to converge without causing route flapping during the transition from backup device to master device. Included in the VRRP-E slow-start timer feature are track port state changes and restart options. The use-track-port option implements a slow-start timer for the first tracked port "up" state change, in addition to the VRRP-E initialization state. The restart option restarts the slow-start timer for subsequent tracked port "up" state changes.
Note: If you change the backup priority of a VRRP-E backup router to be higher than the
priority of the original master device, the slow-start timer will not work. The original
master device will take over from the backup device immediately.