R2511-HP MSR Router Series Security Configuration Guide(V5)

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Packet formats
EAP packet format
Figure 33 shows the EAP packet format.
Figure 33 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 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.
EAPOL packet format
Figure 34 shows the EAPOL packet format.
Figure 34 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. Table 7 lists the t
ypes of EAPOL packets supported by HP
implementation of 802.1X.
Table 7 Types of EAPOL packets
Value T
yp
e Descri
p
tion
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.
015
PAE Ethernet type
Packet body
TypeProtocol version
Length
7
2
4
6
N