User's Manual

User’s Manual of SGS-5240 Series Managed Switch
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Figure 4-5-2-2: EAP Message Exchange
 Ports in Authorized and Unauthorized States
The switch port state determines whether or not the client is granted access to the network. The port starts in the
unauthorized state. While in this state, the port disallows all ingress and egress traffic except for 802.1X protocol
packets. When a client is successfully authenticated, the port transitions to the authorized state, allowing all traffic
for the client to flow normally.
If a client that does not support 802.1X is connected to an unauthorized 802.1X port, the switch requests the
client's identity. In this situation, the client does not respond to the request, the port remains in the unauthorized
state, and the client is not granted access to the network.
In contrast, when an 802.1X-enabled client connects to a port that is not running the 802.1X protocol, the client initiates the
authentication process by sending the EAPOL-start frame. When no response is received, the client sends the request for a
fixed number of times. Because no response is received, the client begins sending frames as if the port is in the authorized state
If the client is successfully authenticated (receives an Accept frame from the authentication server), the port state changes to
authorized, and all frames from the authenticated client are allowed through the port. If the authentication fails, the port remains
in the unauthorized state, but authentication can be retried. If the authentication server cannot be reached, the switch can
retransmit the request. If no response is received from the server after the specified number of attempts, authentication fails,
and network access is not granted.
When a client logs off, it sends an EAPOL-logoff message, causing the switch port to transition to the unauthorized state.
If the link state of a port transitions from up to down, or if an EAPOL-logoff frame is received, the port returns to the unauthorized
state.