Extended support for link aggregation (LAG) on the Cisco Wireless LAN 2500, Flex 7500, and 8500 Series Controllers. With this feature, you can aggregate multiple links to protect against link failures.
Caution When you enable LAG on a Cisco 2500 Series Controller with which a direct-connect access point is associated, the direct-connect access point dissociates with the controller. When LAG is in enabled state, the direct-connect access points are not supported. For direct-connect access points to be supported, you must disable LAG and reboot the controller.
If LAG is enabled on the Cisco 2500 Series Controller and the controller is downgraded to a non-LAG aware release, the port information is lost and it requires manual recovery.