Problem
- We are suspecting some client are unable to connect to 2802 APs. Clients are not connected to the nearest AP. even if a client is standing right in front of an AP, other APs with weaker signal are prefered.
- Affected clients are both Apple and other brands (Dell etc.) and are not related to 2.4Ghz or 5Ghz.
- Affected APs are running with power level 1* on 2.4Ghz & 5Ghz.
- On these APs logs are flooded with invalid staid recieved:
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:48.9936] invalid staid 63 received
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:49.0988] invalid staid 63 received
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:49.1960] invalid staid 63 received
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:49.2949] invalid staid 63 received
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:49.3962] invalid staid 63 received
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:49.4966] invalid staid 63 received
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:49.5976] invalid staid 63 received
Apr 26 00:48:49 kernel: [*04/26/2017 00:48:49.6953] invalid staid 63 received
- These logs corresponding well with when we see clients are unable to connect, but are also present sometimes at night when no users are connected.
- The log output have been present after we upgraded software to 8.2.151.0 (from 8.2.131.0).
What does these logs mean?
I have found two bugs related to this:
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvc06325
https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvd47081/
Troubleshooting
- Installed newest network card drivers on the clients
- Turned of the 5Ghz radio on the AP
- Turned of the 2.4Ghz radio on the AP
- Rebooted AP
- Users who connected right before the "invalid staid recieved" indicated that this is not related to a sertain hardware.
- "invalid staid recieved" might be triggered by clients that tries to connect, but are unable.
Solution so far
- Affected APs have been replaced with older 1142 APs (running on the same controller & software) and the affected clients are now able to connect to the APs. Clients in the region have reported to have better signal strenght.
