Hi,
I'm not entirely clear on what the 'tracking master-up-time' command actually does inside a vrrp declaration. I've tried reading the User Guide and Command Reference, but I'm still not sure. It appears that it ups the priority of the current VRRP master by the specified 'add' value after it has been the master for the specified number of minutes.
For example (showing only the timer bits):
vrrp 10
priority 100
tracking master-up-time 30 add 20
... this means that this VRRP instance has a normal priority of 100. If (and only if) this controller becomes the master and stays that way for 30 minutes, the priority will rise to 120.
As such, this function appears to be useful to make a current VRRP master 'sticky' and avoid unnecessary transitions to another, once it has been the master for a period of time.
if we just want IP (and the APs using it) failover from one controller to another and then preempt back, when it returns, there is no need to use this option? It's only useful when you have multiple controllers in a failover group (using VRRP) and want to carefully assign different APs to each controller, during failover?
Am I right here?
Thanks,
- Bob