AP's not joined to the WLC will or should not still be visible from the 8500. The only spot that an associated ap can be found is in the monitor section under ap join. This section you can clear the entries. If your still seeing an access point, I would verify that maybe another AP is named the same. Take a look at the MAC address of the broken AP and compare it.
The only info a WLC will keep from an AP that is no longer associated to that WLC is in the AP join status. If you have an access point that isn't joined but shows in up under the wireless list, then you might be hitting a bug.
IntroductionHow to use the Wireless LAN Controller Configuration Analyzer (WLCCA)
Javier Contreras is a Senior Tech Lead for the Wireless Business Unit in Cisco, with over 2 decades of experi...
< PRE >
(#)For this reason being that : - application that doesn't use multicast, sends one copy of each packet ( data unit of traffic at layer 3 ) to each client (" who seeks the traffic ).- application that does use multicast, sends ...
Transferring Crash file from standby:
Login to the Active WLC in HA.
(Cisco Controller) >transfer upload datatype crash
(Cisco Controller) >transfer upload filename <Desired filename>
(Cisco Controller) >transfer up...