Currently TACACS is not supported on the Wireless LAN Controllers (WLCs). However, RADIUS can be set up to authenticate management users to the WLC.
To authenticate management users to the WLC through RADIUS, perform these steps:
For more information on how to troubleshoot WLC, refer to Wireless LAN Controller (WLC) Troubleshoot FAQ.
For more information on Configuring Radius server ,refer to Configure the WLC for RADIUS Authentication through an External RADIUS Server section of EAP Authentication with WLAN Controllers (WLC) Configuration Example
For more information about the WLC, refer to Cisco Wireless LAN Controllers.
Configure / Configuration issues
Wireless LAN Controllers
Now it is possible?