Huawei Quidway S3100 Series Operation Manual page 206

Operation Manual – 802.1x
Quidway S3100 Series Ethernet Switches
In an EAPoL packet:
The PAE Ethernet type field holds the protocol identifier. The identifier for 802.1x is
888E.
The Protocol version field holds the version of the protocol supported by the
sender of the EAPoL packet.
The Type field can be one of the following:
00: Indicates that the packet is an EAP-packet, which carries authentication
information.
01: Indicates that the packet is an EAPoL-start packet, which initiates
authentication.
02: Indicates that the packet is an EAPoL-logoff packet, which sends logging off
requests.
03: Indicates that the packet is an EAPoL-key packet, which carries key
information packets.
04: Indicates that the packet is an EAPoL-encapsulated-ASF-Alert packet, which
is used to support the alerting messages of ASF (alert standard forum).
The Length field indicates the size of the Packet body field. A value of 0 indicates
that the Packet Body field does not exist.
The Packet body field differs with the Type field.
Note that EAPoL-Start, EAPoL-Logoff, and EAPoL-Key packets are only transmitted
between the supplicant system and the authenticator system. EAP-packets are
encapsulated by RADIUS protocol to allow them successfully reach the authentication
servers. Network management-related information (such as alarming information) is
encapsulated in EAPoL-Encapsulated-ASF-Alert packets, which are terminated by
authenticator systems.
II. The format of an EAP packet
For an EAPoL packet with the Type value being EAP-packet, the corresponding Packet
body is an EAP packet. Its format is illustrated in Figure 1-4.
0
Code
Figure 1-4 The format of an EAP packe
In an EAP packet:
The Code field specifies the EAP packet type, which can be Request, Response,
Success, or Failure.
The Identifier field is used to match a Response packets with the corresponding
Request packet.
The Length field indicates the size of an EAP packet, which includes the Code,
Identifier, Length, and Data fields.
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Identifier Length
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Chapter 1 802.1x Configuration
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