Symptom
Standby failing to add exclusion client - exclusion client mismatch between Active and Standby WLC
Conditions
Observing exclusion client mismatch between Active and Standby WLC. Standby failing to add the exclusion client entry.
Issue happening due to timing/race condition, Active deletes the client and sends delete request to Standby. Before standby deleting the client, client comes back and active sending add client to exclusion db. Since client entry exists in standby, it's not adding the entry.
(SYARA-KUKRI-Standby) >*HAConfigSyncTask: Jun 14 16:37:51.258: [SS] 04:69:f8:dc:f9:bf Client is already present in Stand-by black list entry
UsmDb:HA_send_usmDbMsFreeBlackListEntry, ErrType:Apply Config failed, Reason:1, TStamp:2018-Jun-14 09:38:25