H3C S5500-EI Series Operation Manual page 7

Operation Manual – 802.1x-HABP-MAC Authentication
H3C S5500-EI Series Ethernet Switches
EAPOL-Encapsulated-ASF-Alert (a
value of 0x04)
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.
II. 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 EAP packet format
Code: Type of the EAP packet, which can be Request, Response, Success, or
Failure.
An EAP packet of the type of Success or Failure has no Data field, and has a length of
4.
An EAP packet of the type of Request or Response has a Data field in the format shown
in Figure
represents Identity, indicating that the packet is for querying the identity of the
supplicant. A value of 4 represents MD5-Challenge, which corresponds closely to the
PPP CHAP protocol.
Figure 1-5 Format of the Data field in an EAP request/response packet
Identifier: Allows matching of responses with requests.
Length: Length of the EAP packet, including the Code, Identifier, Length, and Data
fields, in bytes.
Type
1-5. The Type field indicates the EAP authentication type. A value of 1
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.
Figure 1-4.
1-5
Chapter 1 802.1x Configuration
Description