Broaders,
VRRP rules:
- When a controller comes up it will always listen to see if another device is advertising itself as master on the same VRRP instance (number).
- If it hears a device is already advertising itself as master for that specific VRRP instance (number), the controller coming up will become backup UNLESS --- the controller coming up has a higher priority AND it has preemption enabled.
I repeat:
The only way the second controller will take over the VRRP is if it has higher priority AND preemption is enabled on its VRRP instance.
To guard against the down controller taking over, do this:
- Do a backup flash on the Up master
- Give the UP master a high priority on the VRRP instance AND enable preemption on it
The controller coming up should not take over because it has a lower priority and it cannot preempt
TIP: Make sure tracking is not enabled, because that will just complicate things.