Cisco Aironet 1850, 2800, and 3800 Series APs' second Ethernet port, also called the AUX port（如下图中的④）, is used as a link aggregation (LAG) port, by default. It is possible to use this LAG port as a LAN port when LAG is disabled.
When the AUX port is configured as a LAN port, you can either use the AP group setting to configure the LAN port for a group of APs, or use the LAN override functionality to configure the LAN port for each AP separately. This Cisco Wave 2 AP AUX port to LAN port conversion feature is supported only in the following APs:
After global AP LAG is enabled, the CAPWAP connection with the AP is deleted; that is, the connection is deleted from the database in the controller. This results in AP disjoining and then rejoining the controller. Starting in Release 8.9, the change in functionality is that the connection is explicitly deleted from the database in the controller.
After global AP LAG is disabled, for the APs that do not have LAG enabled, their connection is deleted from the database in the controller. This results in APs to disjoin and rejoin the controller.
After global AP LAG is disabled, the APs that have LAG enabled are rebooted. This functionality remains unchanged.
（WLC）> show ap config general <ap-name>
LAP# show configuration
（WLC）> config ap lag-mode support disable <ap-name>