If you operate RADIUS for the central administration of accounts and access credentials in your wireless network, then the access point forwards requests for the authorization and accounting to the RADIUS server by default. If you are using a WLAN controller for access point management, then the controller can forward RADIUS requests from all of these access points to the RADIUS server.
In some cases, the operator of access points or WLAN controllers may wish to use a different RADIUS server for each logical wireless network (SSID). This may be the case, for example, when multiple customers share the same technical WLAN infrastructure but use their own authentication systems (e.g. with Wireless as a Service – WaaS).
In these cases, you have the option to choose a separate RADIUS profile for each logical WLAN (i.e. each SSID). The RADIUS profile contains all of the necessary information to use the appropriate RADIUS server, including the optional backup solution.