The management and ap-manager must be on the same subnet and of course must have an ip address. So you will need 4 ip addresses in that subnet if you have two WLC's and if you configure LAG. Cisco mentions not having more than 20 ap's on the same subnet as the ap-manager, so if you have more, You should create an AP subnet but have no more than 60 ap's on that subnet.
To avoid inter-controller roaming, make sure ap's are grouped together and is primary on one of the controllers. For example, if you have 6 floors 1-6, floors 1-3 should be put on wlc1 and 4-6 on wlc2. Don't try to mix and match on the same floor. I think they call it salt-n-pepper design.
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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