H3C Technologies H3C S12500-X Series Switches - Manual (Page 75)

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Packet formats
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EAP packet format
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Figure 23 shows the EAP packet format.
Figure 23 EAP packet format
• Code—Type of the EAP packet. Options include Request (1), Response (2), Success (3), or Failure
(4).
• Identifier—Used for matching Responses with Requests.
• Length—Length (in bytes) of the EAP packet. The EAP packet length is the sum of the Code, Identifier,
Length, and Data fields.
• Data—Content of the EAP packet. This field appears only in a Request or Response EAP packet. The
Data field comprises the request type (or the response type) and the type data. Type 1 (Identify) and
type 4 (MD5-challenge) are two examples for the type field.
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EAPOL packet format
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Figure 24 shows the EAPOL packet format.
Figure 24 EAPOL packet format
• PAE Ethernet type—Protocol type. It takes the value 0x888E for EAPOL.
• Protocol version—The EAPOL protocol version used by the EAPOL packet sender.
• Type—Type of the EAPOL packet.
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Table 4 lists the types of EAPOL packets supported by H3C
implementation of 802.1X.
Table 4 Types of EAPOL packets
Value Type Description
0x00 EAP-Packet
The client and the network access device uses EAP-Packets to transport
authentication information.
0x01 EAPOL-Start
The client sends an EAPOL-Start message to initiate 802.1X
authentication to the network access device.
0 15
PAE Ethernet type
Packet body
Type Protocol version
Length
7
2
4
6
N