[USR-TC] Restrict interface for a perticular user

Hi , Can i restrict a specific interface (example slot:10/mod:1) to authenticate only for a perticular user and reject access for other users. or is it possible for any user on the authenticate on that perticular interface get a static ip reserved for that perticular interface.. i tried with the commands "set switched interface Slot:x/mod:y user_name" and "set switched interface slot:x/mod:y password" but this allows even other radius users to authenticate to that interface can anyone help me on this Regards Anil