How much time does an AP take to failover to secondary controller

[roycemathew]

hi All,

My query is to understand how much time will an AP take to failover to its secondary WLC(Backup) incase primary goes offline.

Whats the heartbeat time for each AP to verify reachability to WLC.

also what is the purpose of AP Fail over priority under each AP. i want to ensure AP's fall back to primary WLC once its back online.(Preemption)

[Stephen Rodriguez]

An AP should take about 1-2 minutes to failover to it's Secondary one the primary does not respond.

http://mrncciew.com/2013/04/07/ap-failover/

You are correct, the priority drop down is for preemption. If an AP with a higher priority comes on to a maxed out WLC, a random lower priority will be punted so the higher priority can be joined.

HTH,

Steve

[Sandeep Choudhary]

Hi Matehw,

My query is to understand how much time will an AP take to failover to its secondary WLC(Backup) incase primary goes offline.

We can not tell exact time but normally It takes 1-3 minutes.

Whats the heartbeat time for each AP to verify reachability to WLC.

AP Heartbeat Timeout - AP sends heartbeat to WLC (By default its 30s). Once the primary WLC(or where AP is connected to)goes down, With heartbeats, the AP realizes sooner that the controller has become unreachable.

also what is the purpose of AP Fail over priority under each AP.

First of all there are three types: it goes like this Cirtical...high...medium..low.

***To configure AP failover priority, we must enable AP Fallback feature globally and then individual APs with a suitable priority level. 

*** When using both the local  and global backup configurations, the locally configured settings take precedence in the event of a controller failure. If an AP is not able to join any of the locally configured controllers, it then tries to join the global backup controllers.

More info:

http://rscciew.wordpress.com/2014/01/22/ap-failover/

Regards

Dont forget to rate helpful posts