Switch (edge switch or wireless access point) - controls the physical access to the network based on the authentication status of the client. The switch acts as an intermediary (proxy) between the client and the authentication server, requesting identity information from the client, verifying that information with the authentication server, and relaying a response to the client. The switch includes the RADIUS client, which is responsible for encapsulating and decapsulating the Extensible Authentication Protocol (EAP) frames and interacting with the authentication server.
When the switch receives EAPOL frames and relays them to the authentication server, the Ethernet header is stripped and the remaining EAP frame is re-encapsulated in the RADIUS format. The EAP frames are not modified or examined during encapsulation, and the authentication server must support EAP within the native frame format. When the switch receives frames from the authentication server, the server's frame header is removed, leaving the EAP frame, which is then encapsulated for Ethernet and sent to the client.
There are three states a port can be in when using dot1x: force-authorized, force-unauthorized, and auto. If a port is in force-authorized status, then the switch will not prompt for authentication, and will allow all communication through this port. In the force-unauthorized status, the client doesn抰 even get a chance to authenticate; it is the equivalent of shutting the port down. Even if the user is dot1x capable, the switch just ignores any attempt to communicate through the switch.
Dot1x is supported on Layer 2 static-access ports and Layer 3 routed ports, but is not supported on the following port types: Trunk Port, Dynamic port, Dynamic-access port, EtherChannel Port, Secure Port, or SPAN Ports.
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