3com 5500-ei pwr Instrução De Instalação

 

1-4 

Figure 1-3 The format of an EAPoL packet 

 

 

In an EAPoL packet: 

z 

The PAE Ethernet type field holds the protocol identifier. The identifier for 802.1x is 0x888E. 

z 

The Protocol version field holds the version of the protocol supported by the sender of the EAPoL 

packet. 

z 

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 the 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. 

04: Indicates that the packet is an EAPoL-encapsulated-ASF-Alert packet, which is used to 

support the alerting messages of Alerting Standards Forum (ASF). 

z 

The Length field indicates the size of the Packet body field. A value of 0 indicates that the Packet 

Body field does not exist.  

z 

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. 

For an EAPoL packet with the value of the Type field being EAP-packet, its Packet body field is an EAP 

packet, whose format is illustrated in 

Figure 1-4 The format of an EAP packet 

 

 

In an EAP packet: 

z 

The Code field indicates the EAP packet type, which can be Request, Response, Success, or 

Failure. 

z 

The Identifier field is used to match a Response packet with the corresponding Request packet.