Cisco WLC 9800 and 2702 AP client disassociation timeout

[lawrence.allhands]

So when we were testing a RADIUS config with a client in our lab, we noted the following happen.  A client device turns off its radio. Even though the client radio was turned off, the client entry remained on the WLC/radio for times between 5 minutes - 34 minutes. So three questions.

Why is this?

Is there a timer associated with this?

If there is a timer, can its settings be changed?

Thanks in advance!

[MHM Cisco World]

there is session timeout and idle timeout in WLC 

https://lihaifeng.net/?p=66

this timeout make client appear.

[lawrence.allhands]

So we have our session timeout set to 60 seconds, yet the APs were observed to drop at 5 minutes, 24 minutes, and 34 minutes. I am not sure what is causing this variation in times?

[MHM Cisco World]

idle timeout 
""The valid range is 15 to 100000 seconds. The default value is 300 seconds.""
Session timeout 

the session timeout is set under WLAN BUT it also learn from AAA server when auth/authz the client and the timeout from the AAA server is override the WLAN timeout setting.

[Arshad Safrulla]

Session timeout set to 60 secs is expected to cause roaming issues and random wireless disconnections, set it to the maximum possible value as per your WLC (Catalyst - 86400, Aironet - 65535 or 0)

What you need to check is idle timeout, check what is the value configured there. Also if you are using LWA or CWA you need to take care of sleeping client timeout as well. 

Recommendation is that you always set a higher session timeout and make sure idle timeout is always lower than the session timeout. Also for better understanding next time please post the platform, AP model, auth type, ssid switching method etc.