Symptom
Client stays connected to wireless but some frames are failing to be transmitted to the client from the AP until either of the following occurs:
1. Client wireless adapter gets reset
2. Next reauth
Conditions
Issue triggered after session reauth on macbook during heavy traffic usage.
Workaround
Disable session timeout on the WLAN to mitigate the issue
Disabling session timer means in two folds depending on WLC platform.
For AireOS, configure followings;
"config wlan session-timeout {WLAN_ID} 86400" for 802.1x SSID.
"config wlan session-timeout {WLAN_ID} 0" for Open/PSK or any other than 802.1x SSID.
For C9800 IOS-XE WLCs or EWCs, configure;
C9800#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
C9800(config)# wireless profile policy
C9800(config-wireless-policy)# session-timeout 86400
Avoid using "no session-timeout" or "session-timeout 0" which mean "Roaming across APs are not expected in the SSID."
Further Problem Description
AP client trace shows packets are sent to the device but PCAPs on the affected device shows no response seen
