User’s Manual of GS-4210 Series
Remote Authentication Dial-in User Service (RADIUS)
Terminal Access Controller Access Control System Plus (TACACS+)
Local user name and Privilege Level control
4.9.1.1 Understanding IEEE 802.1X Port-based Authentication
The IEEE 802.1X standard defines a client-server-based access control and authentication protocol that restricts unauthorized
clients from connecting to a LAN through publicly accessible ports. The authentication server authenticates each client
connected to a switch port before making available any services offered by the switch or the LAN.
Until the client is authenticated, 802.1X access control allows only Extensible Authentication Protocol over LAN (EAPOL)
traffic through the port to which the client is connected. After authentication is successful, normal traffic can pass through the
port.
This section includes this conceptual information:
Device Roles
Authentication Initiation and Message Exchange
Ports in Authorized and Unauthorized States
Device Roles
With 802.1X port-based authentication, the devices in the network have specific roles as shown below.
Figure 4-9-1
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