The simplest RADIUS server configuration is a site that uses a single user list for all its users, writes its accounting information to a file, and does not use session management to allocate dynamic resources.
To configure such a site, do the following:
1. Run the aregcmd command on your Cisco AR machine.
2. Configure the Cisco AR RADIUS server settings, such as the server name and the server defaults.
3. Add users by copying the sample users.
4. Configure the NAS clients and proxies that communicate with Cisco AR.
5. Change profile attributes as needed.
6. Save your changes and reload your Cisco AR RADIUS server.
http://www.cisco.com/en/US/customer/products/sw/netmgtsw/ps411/products_installation_and_configuration_guide_chapter09186a008043e915
