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The switch makes use of three kinds of EAPOL protocol frame, including EAPOL-Start: Packet
Type value is 1, as the EAPOL-Start frame, firstly initicate this frame and supplicant system
forward it to switch if user need to be authenticated; EAPOL-Logoff：Packet Type value is 2, as
the EAPOL-Logoff frame, users can send this frame to inform switch if they need not internet;
EAP-Packet: Packet Type value is 0, as the authenticated info. frame, used for loading
authenticated info. About EAP packet format please refer to Figure 8-3. Code indicates the type
of EAP packet, including Request, Response, Success and Failure.
Identifier
Identifier is for indentifying purpose, used for match Response and Request. Length means the
total length of EAP packet, including packet head. Data means EAP packet data. EAP packet
includes following four types: EAP-Request, the code value is 1, as the EAP-Request packet,
request user's name and/or password from switch to suppliant system. EAP-Success：Code
value is 3, as the EAP-Success packet, to send to supplicant system from switch to inform whom
it is successful. EAP-Failure: Code value is 4, as the EAP-Failure packet, to send to supplicant
system from switch to inform whom it is failed.
Figure 8-3. EAP Packet Format
3. Internation of Protocol Flow
All users should after be authenticated can visit the internet if the switch make use of 802.1x and
the port is in Auto status. About Protocol Internation please refer to Figure8-4
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