Can the LWAPPs join a WLC that belongs to a Mobility Group that is different from the currently associated Mobility Group?
A. In all Wireless LAN Controller (WLC) versions earlier than 4.2.61.0, when a WLC goes “down,” the LAP registered to this WLC can failover only to another WLC of the same Mobility Group, if the LAP is configured for failover. From Cisco WLC version 4.2.61.0 and later, a new feature called Backup Controller Support is introduced for access points to failover to controllers even outside the Mobility Group. Refer to Wireless LAN Controller and Light Weight Access Points Failover Outside the Mobility Group Configuration Example for more information.
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