The primary RADIUS server (the server with the lowest server index) is assumed to be the most preferable server for the Cisco WLC. If the primary server becomes unresponsive, the controller switches to the next active backup server (the server with the next lowest server index). The controller continues to use this backup server, unless you configure the controller to fall back to the primary RADIUS server when it recovers and becomes responsive or to a more preferable server from the available backup servers.
| Step 1 |
| Navigate to Security
> AAA > RADIUS > Fallback |
| Step 2 |
| Set the Fallback Mode
to Active. |
| Step 3 |
| For the Username,
enter the name to be sent in the inactive server probes. |
| Step 4 |
| Enter a value for the
Interval in Sec. field. |
The interval serves as inactive time in passive mode and probe interval in active mode. The valid range is 180 to 3600 seconds, and the default value is 300 seconds.