718 CHAPTER 50: 802.1X CONFIGURATION
Figure 212 EAPOL frame format
■ PAE Ethernet type: Protocol type. It takes the value 0x888E.
■ Protocol version: Version of the EAPOL protocol supported by the EAPOL frame
sender.
■ Type: Type of the EAPOL frame. Table 57 shows the defined types of EAPOL
frames.
■ 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 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 213.
Table 57 Types of EAPOL frames
Type Description
EAP-Packet (a value of 0x00) Frame for carrying authentication information,
present between an authenticator system 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 supplicant and an authenticator.
EAPOL-Logoff (a value of 0x02) Frame for logoff request, present between a
supplicant and an authenticator.
EAPOL-Key (a value of 0x03) Frame for carrying key information, present
between a supplicant and an authenticator.
EAPOL-Encapsulated-ASF-Alert (a value of
0x04)
Frame for carrying alerting information compliant
to Alert Standard Forum (ASF).
A frame of this type carries network
management-related information like warning
messages and is terminated at the authenticator.
015
PAE Ethernet type
Packet body
TypeProtocol version
Length
7
2
4
6
N
To Next Page
Loading...
