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AP's do not form backup tunnel in HA pair.

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TitleAP's do not form backup tunnel in HA pair.
Symptoms
AP's do not form backup tunnel in HA pair. Failover not working.
Environment
Identifi
Cause
Binding key mismatch between controllers. You can prove this by doing the following:
  • SSH into both EWCs, then get into the shell.
  • enter the command:  cd /var/controller/debug/cm
  • enter the following command using an attached AP's serial number:  ./shmapitest aplist | grep -i  14131071085j0000
You will see an output like this:

ets-Murdock-WC.mcla.edu# shell
Password:
root@ets-Murdock-WC:~# cd /var/controller/debug/cm
root@ets-Murdock-WC:/var/controller/debug/cm# ./shmapitest aplist | grep -i
root@ets-Murdock-WC:/var/controller/debug/cm# ./shmapitest aplist | grep -i  14131071085j0000
14131071085J0000 (TowerB-TB-3-4) bindkey=078D6D43D2BC93982AA099A06AEA7C67 LOCAL=1 connected=1 tunnel_state=1 id=294

Run these commands on both sides of the pair, verifying that the bindkey matches on both. 
Resolution
If the bindkey doesn't match on both sides bounce the availability link by setting both sides as stand-alone, and then re-pair.
Additional notes

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