1-5
EAP over LANs
EAPOL frame format
EAPOL, defined in 802.1X, is intended to carry EAP protocol packets between clients and devices over
LANs.
Figure 1-3 shows the EAPOL frame format.
Figure 1-3 EAPOL frame format
z PAE Ethernet type: Protocol type. It takes the value 0x888E.
z Protocol version: Version of the EAPOL protocol supported by the EAPOL frame sender.
z Type: Type of the EAPOL frame. Table 1-1 lists the types that the device currently supports.
Table 1-1 Types of EAPOL frames
Type Description
EAP-Packet (a value of 0x00)
Frame for carrying authentication information, present between
a device and the authentication server.
A frame of this type is repackaged and transferred by RADIUS
to get through complex networks to reach the authentication
server.
EAPOL-Start (a value of 0x01)
Frame for initiating authentication, present between a client and
a device.
EAPOL-Logoff (a value of 0x02) Frame for logoff request, present between a client and a device.
z 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.
z Packet body: Content of the packet. The format of this field varies with the value of the Type field.
EAP Packet Format
An EAPOL frame of the type of EAP-Packet carries an EAP packet in its Packet body field. The format
of the EAP packet is shown in
Figure 1-4.
Figure 1-4 EAP packet format
015
Code
Data
Length
7
Identifier
2
4
N
z Code: Type of the EAP packet, which can be Request, Response, Success, or Failure.
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