Re: multiple ap manager interfaces on AIR-WLC4402-50-K9 don't wo
as I read in the following documents the ap manager interface cannot be mapped to a backup port. So if there is a failure of the primary link the ap manager interface will go down and the wlc cannot be reached by any ap. To prevent this you can add a second ap manager interface which is mapped to the second physical port of the wlc. So the wlc will be able to reach the aps also if the primary link goes down.
Furthermore, one physical wlc port can only handle 48 APs, so if you want to use all 50 connections of our wlc model, you have to use 2 ap manager interfaces and bind each to one of the 2 physical ports.
I hope that helps, please correct me if my understanding of the mentioned documents is wrong.