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Figure 51-1: PPPoE IA protocol exchange process
51.1.2.2 PPPoE Packet Format
PPPoE packet format is as follows:
Ethernet II frame
Destination MAC
Source MAC
Type Field
PPPoE Data
CRC Check Sum
PPPoE data
Version
Type
Code
Session ID
Length Field
TLV1
......
TLV N
TLV frame
Type
Length
Data
Each field meanings in the following:
Type field (2 bytes) of Ethernet II frame: The protocol sets type field value of PPPoE protocol
packet as 0x8863 (include 5 kinds of packets in PPPoE discovery stage only), type field value
of session stage as 0x8864.
PPPoE version field (4 bits): Specify the current PPPoE protocol version, the current version
must be set as 0x1.
PPPoE type field (4 bits): Specify the protocol type, the current version must be set as 0x1.
PPPoE code field (1 byte): Specify the packet type. 0x09 means PADI packet, 0x07 means
PADO packet, 0x19 means PADR packet, 0x65 means PADS packet, 0xa7 means PADT
packet.
PPPoE session ID field (2 bytes): Specify the session ID.
PPPoE length field (2 bytes): Specify the sum of all TLV length.
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