Do you want your clients at the remote site to get connected with the Anchor controller in the DMZ ? If yes, then in that case you can use your remote office Anchor controller as a Foreign controller and run the show.
So you want the remote Anchor controller to be treated as a backup. Right ?
In my knowledge, that's not possible to use only one anchor controller at one time. since we have to enter the Anchor controller details in the foreign controller. So if we enter both the Anchor controllers in the Foreign controller they will start load balancing.
Other process is - make a manual entry in the Foreign controller at the time of primary anchor controller failure so that the traffic start moving to remote anchor controller. This is a work around.
Otherwise I don't know if there are any settings which can be done at the Primary Anchor controller to switch to backup controller in the event of failure.
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
This is the start of a display filter cross reference between Wireshark
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