3Com Switch 8800 Advanced Software V5 Configuration Guide

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920 CHAPTER 71: 802.1X CONFIGURATION

Protocol version: Version of the EAPOL protocol supported by the EAPOL frame

sender.

Type: Type of the packet. The following types are defined:

■ EAP-Packet (a value of 0x00), frame for carrying authentication information.

■ EAPOL-Start (a value of 0x01), frame for initiating authentication.

■ EAPOL-Logoff (a value of 0x02), frame for logoff request.

■ EAPOL-Key (a value of 0x03), frame for carrying key information.

■ EAPOL-Encapsulated-ASF-Alert (a value of 0x04), frame for carrying alerting

information compliant to Alert Standard Forum (ASF).

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: The format of this field varies with the value of the Type field.

A frame of the type of EAPOL-Start, EAPOL-Logoff, or EAPOL-Key exists between a

supplicant and an authenticator. A frame of the type of EAP-Packet is repackaged

and transferred over RADIUS to get through complex networks to reach the

authentication server. A frame of the type of EAPOL-Encapsulated-ASF-Alert

carries network management-related information (for example, various warning

messages) and is terminated at the authenticator.

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 268.

Figure 268 EAP packet format

Code: Type of the EAP packet, which can be Request, Response, Success, or

Failure.

Identifier: Allows matching of responses with requests.

Length: Length of the EAP packet, including the Code, Identifier, Length, and Data

fields, in bytes.

Data: This field is zero or more bytes and its format is determined by the Code

field.

An EAP packet of the type of Success or Failure has no Data field, and has a length

of 4. The Data field in an EAP packet of the type of Request or Response is in the

format shown in

Figure 269.

015

Code

Data

Length

Identifier