User authorization through the RADIUS protocol is not supported. The access control of RADIUS users is enforced by the Extreme role-based access control (RBAC) protocol at the device level. A RADIUS user should therefore be assigned a role that is present on the device using the Vendor Specific Attribute (VSA) Brocade-Auth-Role. After the successful authentication of the RADIUS user, the role of the user configured on the server is obtained. If the role cannot be obtained or if the obtained role is not present on the device, the user will be assigned the "user" role and a session is granted to the user with "user" authorization.