To enable Radius load balancing :
ClearPass Server now allows you to see requests coming to more than one server at same time in access tracker before you could only see one at a time or the other and this is perfect since the controller is able to do load balancing
Here's an example of load balancing between two clearpass servers:
Another cool feature is that you are now able to see if the device is "Online"
In order to do this you need to enable accounting under the AAA profile and add ClearPass as an accounting server and make sure that accounting is also enabled under the server configuration settings