FreeRADIUS attributes

Hello, i would to deploy a freeradius system with dynamic vlan assignment in a wireless LAN. Ths SSID must be unique and the VLAN must be assigned via auth-type or username. The authentication is EAP and the users are in the "users" file. How can to pass a radius attributes, like auth-type, to my wireless switch? -------------------------------------- Vincenzo Agosti --------------------------------------