I think your problem might be related to this field notice: Field Notice:
7920 Locks Up after Receiving Inter-Access Point Protocol Response Packet from Cisco Aironet Access Points Controlled by Wireless LAN Controller Software Releases 126.96.36.199, 188.8.131.52, or 184.108.40.206 and Later Releases of 4.0
Have you contacted TAC yet? There is an issue with 7920s on LWAPP APs where a lot of APs or a lot of SSIDs per AP could cause issues with 7920s. There is an engineering code if you are running into this, but you need to talk to TAC to figure out if that is the problem. Sorry I don't have more info, but I have just started looking into it. Just wanted to let you know that if you haven't talked to TAC yet, it might be good to start because there are some outstanding issues that are not strictly config issues.
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...
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(#)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...