Wireless Access

without apparent reason, 3 access points at same location, "stopped working". The correct SSIDs were not broadcasted.

Topology: MM/MD

AOS: 8.3.0.7_70587 (MD)

AOS: 8.5.0.7_74786 (MM)

We found out that the wrong ap-group was assigned and did a re-provision to correct this.

BUT we want to know what's the root cause of this behaviour.

What we have done so far:

- open Aruba TAC

- checked controller(s) techsupport logs

- checked MM audit trail

- checked if there is an AP regroup config (There is no AP regroup config)

- checked if there is an assignment in the whitelist-db cpsec (APs are not whitelisted any ap-group)

No config changes or errors were seen...

Aruba TAC: 

„If we are looking for an RCA, we need the tech support logs collected during the issue.”

Is it possible that the APs loaded a previous configuration for some reason e.g. AP Reboot, AP power loss, AP failover …, and thus configured the wrong AP group?

Do you have any other ideas?

Many thanks in advance for any reply!

Kevin

The ap-group is provisioned in flash, and that can be changed outside of the audit trail on the MM.  There are multiple ways that can be done, so they would have to be explored in its entirety.  Do you have another older Aruba installation on the same network?

Hi cjoseph,

many thanks for your reply!

"There are multiple ways that can be done, so they would have to be explored in its entirety."

=> Could you please describe it in more detail? What could be the next steps?

And no, there is no older aruba setup in the same environment.

Best regards

Kevin

I would keep working with TAC, because this would be a guessing game what might have happened.

An ap group can be changed via the console,   if you have the logs covering that time when it changed  TAC might be able to recreate what happened