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Cisco Employee

I would like to know how the AP fallback algorithm works.

I just want to know if this feature requires also the controller's mac-address. I have two 2504 running 7.4.121 code and 8 APs.

4 APs with primary controller WLC1 and secondary WLC2

The other 4 APs with primary WLC2 and secondary WLC1.

The WLC1 failed and was replaced. The configuration was transfer to the replacement one. The primary and secondary were set on the High Availability tab on each AP. The failover worked perfect. AP fallback enable on both WLCs. When replacement WLC1 was connected to the network, the 4 APs didn't fallback to it. Instead they needed to be rebooted to join it.

Thanks in advance.

1 ACCEPTED SOLUTION

Accepted Solutions
VIP Purple

Typically when an AP fail

Typically when an AP fail overed to secondary/tertiary controller, AP will periodically check the primary controller availability (default in every 30s).

I would suspect, in your case you have completely changed the hardware of the primary controller.So those AP had to reboot to firsttime join this new WLC (it is not same as your WLC failed -> AP registered to 2nd WLC -> same primary WLC came back online which was failed -> AP fall back to 1st WLC)

Here is AP failover information as per 8.0 config guide

http://www.cisco.com/c/en/us/td/docs/wireless/controller/8-0/configuration-guide/b_cg80/b_cg80_chapter_01101111.html

Here is some more detail on this (based on 7.0.116.0 code)

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

HTH

Rasika

*** Pls rate all useful responses ***

 

2 REPLIES
Cisco Employee

This scenario doesn't

This scenario doesn't requires controller's mac-address.

I hope you configured the HA on the per AP basis. You could have checked show ap config general <ap_name> to see if the controller's are coming properly in primary and secondary controller.

-thanks

Vinod

-Thanks Vinod **Rating Encourages contributors, and its really free. **
VIP Purple

Typically when an AP fail

Typically when an AP fail overed to secondary/tertiary controller, AP will periodically check the primary controller availability (default in every 30s).

I would suspect, in your case you have completely changed the hardware of the primary controller.So those AP had to reboot to firsttime join this new WLC (it is not same as your WLC failed -> AP registered to 2nd WLC -> same primary WLC came back online which was failed -> AP fall back to 1st WLC)

Here is AP failover information as per 8.0 config guide

http://www.cisco.com/c/en/us/td/docs/wireless/controller/8-0/configuration-guide/b_cg80/b_cg80_chapter_01101111.html

Here is some more detail on this (based on 7.0.116.0 code)

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

HTH

Rasika

*** Pls rate all useful responses ***

 

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