Symptom
The WLAN is PSK with a valid session timeout.
AP is 3800 and WLC is 9800.
Client is joined to the PSK WLAN and passing bidirectional traffic.
At the end of the session timeout we see the client getting deauth from the WLC logs.
2022/01/08 14:14:41.074894 {wncd_x_R0-0}{1}: [dot11] [26619]: (info): MAC: aaaa.bbbb.cccc Total length of Deauth/Disassoc: 2
2022/01/08 14:14:41.074974 {wncd_x_R0-0}{1}: [dot11] [26619]: (info): MAC: aaaa.bbbb.cccc Sent disassoc to client, disassoc reason: 252, CLIENT_DEAUTH_REASON_ADMIN_RESET delete reason: 24, CO_CLIENT_DELETE_REASON_SESSION_TIMEOUT.
2022/01/08 14:14:41.074977 {wncd_x_R0-0}{1}: [dot11] [26619]: (info): MAC: aaaa.bbbb.cccc Total length of Deauth/Disassoc: 2
2022/01/08 14:14:41.075033 {wncd_x_R0-0}{1}: [dot11] [26619]: (info): MAC: aaaa.bbbb.cccc Sent deauth to client, deauth reason: 252, CLIENT_DEAUTH_REASON_ADMIN_RESET delete reason: 24, CO_CLIENT_DELETE_REASON_SESSION_TIMEOUT.
But in the AP we can multiple deauth getting send D:W
[*01/08/2022 19:19:08.866132] [3802-mbr] [aa:aa:bb:bb:cc:cc] [U:E] ARP_QUERY : Sender 10.1.61.142 TargIp 10.1.61.136
[*01/08/2022 19:19:47.762119] [3802-mbr] [[aa:aa:bb:bb:cc:cc] [D:W] DOT11_DISASSOC : (.)
[*01/08/2022 19:19:47.762811] [3802-mbr] [[aa:aa:bb:bb:cc:cc] [D:W] DOT11_DEAUTHENTICATION : (.)
[*01/08/2022 19:19:47.763305] [3802-mbr] [[aa:aa:bb:bb:cc:cc] [D:W] DOT11_DEAUTHENTICATION : (.)
We can see the same in the OTA Capture as well.
Workaround
May be disabled session timeout. But have not tried it yet
Further Problem Description
This may cause client devices to stop attempting to reconnect, or lock up.
