WLC Not Monitoring AP Status Correctly?

Question

My 8510 HA pair running 8.0.110.0 doesn't seem to be monitoring the AP status properly. If an AP goes down or is otherwise taken off line, the total number of AP's on the Summary page drops by 1. It should show the same number of Total APs with the number of Up units dropping by 1 and show 1 unit down. 
Any suggestions?
Thanks,
Dan

Answer 1

Similarly, I am working on a solution to monitor APs status through Catalyst 3850 switch, but I found the no specific traps are defined for AP status when AP goes UP/DOWN, only found the traps for ApIfUp/ApIfDown.
The Catalyst3850 supports CISCO-LWAPP-AP-MIB, only the following traps are defined under ciscoLwappApMIBNotifs, which are:
ciscoLwappApIfRegulatoryDomainMismatchNotif(1)
ciscoLwappApCrash (2)
ciscoLwappApUnsupported (3)
ciscoLwappApAssociated (4)
ciscoLwappApPower (5)
ciscoLwappApRogueApDetected (6)
ciscoLwappApRogueApCleared (7)
ciscoLwappApWipsNotification (8)
ciscoLwappApNoDownlinkChannelNotify (9)
ciscoLwappApIfUpNotify (10)
ciscoLwappApIfDownNotify (11)
The Catalyst3850 switch also support AIRESPACE-WIRELESS-MIB, in this mib, there are two traps defined when AP goes UP/DOWN, which are:
bsnAPUp and bsnAPDown, but their status are 'obsolete' instead of 'current', and I can't trigger these traps, the only trap I got when disconnecting an AP is the ciscoLwappApAssociated trap, and it only generated after the AP rejoined the controller again, obviously it can't be used for my requirement.
Is there any way to monitor APs status via the switch/wireless controller in Catalyst 3850? what trap can I use?
Thank you in advance.
Tyler Chen