Pppoe Session Establishment Process - Huawei AR530 Series Configuration Manual

Huawei AR530&AR550 Series Industrial Switch Routers
Configuration Guide - WAN
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3.2.3 PPPoE Session Establishment Process

Figure 3-4
Figure 3-4 PPPoE session establishment process
Discovery
Terminate
The PPPoE session establishment process includes three stages: Discovery, Session, and
Terminate.
Discovery Stage
The Discovery stage consists of the following steps:
Issue 01 (2014-11-30)
Session_ID: indicates the session ID. It is an unsigned number in network byte order. This
field is 16 bits in length.
The value is fixed for a given PPPoE session and defines a PPPoE session along with
Ethernet Source_address and Destination_address.
The value 0xFFFF is reserved.
Length: indicates the length of the PPPoE payload. This field is 16 bits in length. It does
not include the length of the Ethernet or PPPoE packet header.
Tag_Type: indicates the network byte order. This field is 16 bits in length.
Tag_Length: indicates the number of bytes of the Tag_Value field. It is an unsigned number
in network byte order. This field is 16 bits in length.
Checksum: checks the validity of packets.
shows the process of establishing a PPPoE session.
PPPoE Client
Session
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PPPoE Server
PADI
PADO
PADR
PADS
PPP negotiation
Data transmission
PADT
3 PPPoE Configuration
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