262 Configuring Switch InformationPort Based AuthenticationPort based authentication enables authenticating system users on a per-port basis via an external server.Only authenticated and approved system users can transmit and receive data. Ports are authenticated viathe RADIUS server using the Extensible Authentication Protocol (EAP). Port Authentication includes:• Authenticators — Specifies the device port which is authenticated before permitting system access.• Supplicants — Specifies host connected to the authenticated port requesting to access the systemservices.• Authentication Server — Specifies the external server, for example, the RADIUS server that performsthe authentication on behalf of the authenticator, and indicates whether the supplicant is authorizedto access system services.Port based authentication creates two access states:• Controlled Access — Permits communication between the supplicant and the system, if thesupplicant is authorized.• Uncontrolled Access — Permits uncontrolled communication regardless of the port state.The device currently supports Port Based Authentication via RADIUS servers.MAC Based AuthenticationMAC based authentication is an alternative to 802.1x that allows allows network access to devices(such as printers and IP phones) that do not have the 802.1X supplicant capability. MAC authenticationuses the MAC address of the connecting device to grant or deny network access.Advanced Port Based AuthenticationAdvanced Port Based Authentication:• Enables multiple hosts to be attached to a single port.• Requires only one host to be authorized for all hosts to have system access. If the port is unauthorized,all attached hosts are denied access to the network.• Enables user based authentication. Specific VLANs in the device are always available, even if specificports attached to the VLAN are unauthorized.– For example, Voice over IP does not require authentication, while data traffic requiresauthentication. VLANs for which authorization is not required can be defined. UnauthenticatedVLANs are available to users, even if the ports attached to the VLAN are defined as authorized.Advanced Port Based Authentication is implemented in the following modes:• Single Host Mode — Enables only the authorized host for single-session access to the port.• Multiple Host Mode — Enables multiple hosts to be attached to a single port, for single-sessionaccess. Only one host must be authorized for all hosts to access the network. If the host authenticationfails or an EAPOL-logoff message is received, all attached clients are denied network access.
