I have Cisco AP3802 in production and recently upgraded my WLC to 220.127.116.11 because of some bugs. But, after the upgrade some of the APs sometimes became unresponsive to serve clients for several seconds. I'm not sure what happened but the AP was not down (uptime is not reset) and client still connected to the AP (but when pinging the gateway the result was RTO). I already checked the log both on WLC and AP, so far got nothing on that timeframe. I also checked the event viewer on the Windows 10 laptops, and also got none. I checked the interference from other AP (from WLC dashboard), it was minimal.
Any idea what else should I check? Because I'm kind of clueless here what's causing this.
Yes I do have TAC support, but I'm not sure what to give to TAC since the logs on WLC and AP were clean. Any advise where should I start?
Unfortunately I have to wait until it happens again. Regarding packet capture, should I use the additional USB packet sniffer? Or can it accomplished by sending the logs on the AP to a syslog server?
Most of our wireless NICs are MU-MIMO capable. And how do I disable MU-MIMO on WLC? Tried to google it and search it on WLC, but so far no luck.
Ah finally I find it. Thank you very much. Will disable it and monitor for the next 7 days.
Can I get the link to the bug page that you said before? Just for my reference and my justification to the management.
Had to search a little, but finally found it:
Check if the text under "Symptom" applies to you.
Please note, I don't have any issues with 2802i APs (which normally run the same software and have the same hardware as the 3802i) with 18.104.22.168. At least no user reported an issue so far and running that code since several weeks.
The symptoms are not the exam same. I did not find the exclamation mark on the WiFi icon and I do not have to disconnect and reconnect (reassociate) since the traffic will be normal after waiting for several seconds. Maybe the root cause is the same? Kind of a similar thing.
I do have 2802 on deployment, but as WIPS. And the WIPS is not functioning as expected on 2.4GHz band.
Do you have any concern for disabling 11ac MU-MIMO? All of the laptops on our environment are 11ac capable. But there are mobile devices that are not. The comparison let's say 1:1.