H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 385)

35-4
Figure 35-3 EAPOL frame format
PAE Ethernet type: Protocol type. It takes the value 0x888E.
Protocol version: Version of the EAPOL protocol supported by the sender.
Type: Type of the EAPOL frame. Table 35-1 lists the types that the device currently supports.
Table 35-1 Types of EAPOL frames
Type Description
EAP-Packet (a value of 0x00)
Packet for carrying authentication information, present between the device
and the authentication server.
A packet of this type is repackaged and transferred by RADIUS on the
device to get through complex networks to reach the authentication server.
EAPOL-Start (a value of 0x01) Packet for initiating authentication, present between a client and the device.
EAPOL-Logoff (a value of 0x02) Packet for the logoff request, present between a client and the device.
Length: Length of the data, that is, length of the Packet body field, in bytes. If the value of this field is 0,
no subsequent data field is present.
Packet body: Content of the packet. The format of this field depends on the value of the Type field.
EAP packet format
An EAP-Packet-type EAPOL frame carries an EAP packet in its Packet body field. The format of the
EAP packet is shown in Figure 35-4 .
Figure 35-4 EAP packet format
Code: Type of the EAP packet, which can be Request, Response, Success, or Failure.
An EAP success/failure packet has no Data field, and has a length of 4.
An EAP Request/Response packet has a Data field in the format shown in Figure 35-5 . The Type
field indicates the EAP authentication type. A value of 1 represents Identity, indicating that the
packet is for querying the identity of the client. A value of 4 represents MD5-Challenge, which are
similar to the PPP CHAP protocol.