PLANET FGSW-2620VM - Manual (Page 64)

FGSW-2620VM / FGSW-2624SF User’s Manual
z Switch (802.1X device)—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.
„ Authentication Initiation and Message Exchange
The switch or the client can initiate authentication. If you enable authentication on a port by using the dot1x
port-control auto interface configuration command, the switch must initiate authentication when it determines that the
port link state transitions from down to up. It then sends an EAP-request/identity frame to the client to request its identity
(typically, the switch sends an initial identity/request frame followed by one or more requests for authentication
information). Upon receipt of the frame, the client responds with an EAP-response/identity frame.
However, if during bootup, the client does not receive an EAP-request/identity frame from the switch, the client can
initiate authentication by sending an EAPOL-start frame, which prompts the switch to request the client's identity.
#
Notice:
If 802.1X is not enabled or supported on the network access device, any EAPOL frames from the
client are dropped. If the client does not receive an EAP-request/identity frame after three attempts
to start authentication, the client transmits frames as if the port is in the authorized state. A port in
the authorized state effectively means that the client has been successfully authenticated.
When the client supplies its identity, the switch begins its role as the intermediary, passing EAP frames between the
client and the authentication server until authentication succeeds or fails. If the authentication succeeds, the switch port
becomes authorized.
The specific exchange of EAP frames depends on the authentication method being used. “Figure 2-43” shows a
message exchange initiated by the client using the One-Time-Password (OTP) authentication method with a RADIUS
server.
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