I recently configured a DMZ Anchor controller and both control and data paths are showing 'up'. When a user connects the the WLAN they are receiving an IP address from the foreign controller interface rather than the DMZ anchor which is configured for an internal DHCP server. I have the guest WLAN configured with the management interface which has the controller's IP as the DHCP server.
Could you please try enabling DHCP Proxy on Anchor Controller:-
Controller > Advanced > DHCP > Enable DHCP Proxy
When DHCP proxy is enabled on the Cisco WLC, the Cisco WLC unicasts DHCP requests from the client to the configured servers. Consequently, at least one DHCP server must be configured on either the interface associated with the WLAN or the WLAN itself.
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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