Mobility Tunnel Went down b/n 9800 L and 9880 anchor WLC

[atsethedros]

I encountered an issue with a working mobility tunnel went down for unknown reason and could not get it back up. The foreign WLC which is 9800 L F with 17.12.6a code version and an anchor WLC 9880 running 17.12.4 code version sitting behind a Palo Alto Firewall. The tunnel was working and the the firewall rules are verified in place. I have removed the tunnels both ends but yet no luck. The foreign WLC is fully provisioned from Catalyst Center in an SDA environment. 

@Mark Elsen 

[Mark Elsen · Accepted solution]

    - @atsethedros  Verify the configuration of both controllers using the CLI command show tech wireless
                              and feed the output from that into Wireless Config Analyzer   (CORRECTED)

                                      Look at these commands for additional troubleshooting
                                                 show wireless mobility summary
                                                 show wireless stats mobility
                                                 show wireless stats mobility messages
                                                 show platform hardware chassis active qfp feature wireless punt  statistics

  M.

[atsethedros]

Following your advice, I observed that the foreign controller did not initiate any contact and that the majority of the statistics were zero. I therefore disabled all anchored WLANs and the related policies. After removing and re-creating the mobility tunnel configuration from both controllers, I enabled the WLAN and Policy profiles, which restored the mobility tunnel.

Thank you!!!

[Mark Elsen]

  - @atsethedros       Great work ; actually the procedure to validate a controller's configuration had a mistake:
                                 Verify the configuration of both controllers using the CLI command show tech wireless
                                 and feed the output from that into  Wireless Config Analyzer

                                 It will give you lot's of advices and tips concerning the configuration for both controllers

  M