Thanks for the replies
There's no local controller available, the rfdm is also not configured to be a controller, the APs are moving between the old RFS6000 and the new VX9000 (both not onsite)
unless is the RFDM that is sending them back to the RFS6000? Is that what you mean?
So if I set both RFDs to controller managed they will disregard the RFDM and just use option 191?