From what I've seen with AP Fallback enabled is this:
If one controller crashes or reboots, the APs from that controller will go to the other controller that is set as their Secondary. However, once the crashed controller comes back the APs will not disconnect from the secondary and jump back to the Primary. I've found the only way to do this is to reset the APs. From what I have seen, AP Fallback mode is nice, but it doesn't seem to make the APs go back to their Primary controller.
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