WLC 9800-L - WLC MAC stopped learning on switch end.

[dinesh-sekar2]

Hi 

We have setup for WLC 9800-L with HA pair. Intermittently MAC stopped learning at switch end. After bounce the port on switch end, it's come to online.

 We have tried with shutdown the standby WLC , still issue persist.

[marce1000]

 - Does this have an impact on the  WLC 9800-L controller (HA) functionality and or the wireless environment ?

 M.

[dinesh-sekar2]

User won't impact since all the WAPs are in flex mode. but we are getting alerts once WLC stopped working.

[marce1000]

       -  What are those alerts ? 
       - How do you define :  WLC stopped working ?

 M.

[dinesh-sekar2]

WLC MAC address stopped learning on switch end, but the interface showing UP. 

[marce1000]

  - Examine the logs on the controller with the (CLI) command : show logging
  + Have a checkup of the (primary) controller configuration with the CLI command show tech wireless
    and feed the output from that into : Wireless Config Analyzer
    do not use simple : show tech as input for this procedure
  + What software version is the 9800-L controller running ?

  M.

[dinesh-sekar2]

 Cisco Catalyst 9800-L Wireless Controller
17.6.4

[marce1000]

   > Cisco Catalyst 9800-L Wireless Controller
17.6.4

         - That version is very old , upgrade to 17.12.3

 M.

[MHM Cisco World]

Share 

From both wlc

Administration >device > redundacy 

Also share show mac in SW

MHM

[dinesh-sekar2]

after bounced the ports, it's learning MAC address now.

[Leo Laohoo]

If the WLC are in an HA SSO, perform a failover.

[dinesh-sekar2]

currently, we have shut the standby and keep it active in online 

[dinesh-sekar2]

could anybody please share, how to verify the logs on 9800 WLC Controller related issues ?

[marce1000]

 - You can check logs on the 9800 WLC with the CLI command show logging

 M.