I'm getting problems while trying to create an anchor WLC with both WLC5508 and 2 WISM modules. Everything looks correct but under Mobility Groups the status for the remote controller is in "Data and Control path down". As there is a LAN Extension between remote sites, there is no firewall between the controllers so it can't be due to filtering. L3 reacheability between management VLAN for the WISM and management VLAN for the 5508 is ok as there is ping between them but no mping or eping success.
AirOS version in all the controller is the same to discard problems between different releases, 18.104.22.168. And yes, the Mobility group in both 3 controllers is the same under General Options and Mobility Group Option, and I'm matching the correct burned-in MAC address and management interface IP address.
You can issue an mping and eping to determine what ports are being blocked. I say blocked, because many times there isn't a FW but an acl that blocking traffic somewhere. As long as the MAC address specified in the mobility group is correct then check any acl's that might be preventing the protocols for mping and eping. I would also delete the entries in the mobility group and add them back as I have seen issue with that is the past.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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