well my first thought was to add "service compress config" then I realised that the boot-roms in AP's don't support compressed configs. Your only real option is to reduce the config. 31K is very large for an access point.
Maybe it's time to consider using a different authentication other than mac.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
This is the start of a display filter cross reference between Wireshark
and OmniPeek. The 1st installment is a table of advanced filters. More
filters will be added as time allows. It is a living doc, so check back
for changes every so often Please feel f...