Planet XGS3-24042 User Manual download pdf (Page 567)

100

101

61-11

PADO packet match with the servce information needed by client). MAC address of the other end

used for session will be known after server is selected, and send PADR (PPPoE Active Discovery

Request) packet to it to announce server the session requirement.

4. Server responds PADS packet: The fourth step, server establishes a session ID according to the

received PADR packet, this session ID will be sent to client through PADS (PPPoE Active Discovery

Session-confirmation) packet, hereto PPPoE discovery stage is completed, enter session stage.

PADT (PPPoE Active Discovery Terminate) packet is an especial packet of PPPoE, its’ Ethernet protocol

number (0x8863) is the same as four packets above, so it can be considered a packet of discovery stage. To

stop a PPPoE session, PADT may be sent at the discretional time of the session. (It can be sent by client or

server)

PPPoE Intermediate Agent supplies a function that identify and locate the user. When passing network

access device, PADI and PADR messages sent by client with the access link tag of this device at PPPoE

discovery stage, so as to exactly identify and locate the user on server.

If the direct-link access device is LAN switch, the added information include: MAC, Slot ID, Port Index, Vlan ID,

and so on. This function is implemented according to Migration to Ethernet-based DSL aggregation.

61.1.2.1 PPPoE Intermediate Agent Exchange Process

PPPoE Intermediate Agent exchange process is similar to PPPoE exchange process, for the first exchange

process, the access link tag is added to PADI and PADR packets. The exchange process is as follows:

Figure 61-1 PPPoE IA protocol exchange process

61.1.2.2 PPPoE Packet Format

PPPoE packet format is as follows:

Ethernet II frame

Destination MAC

Source MAC

Type Field

PPPoE Data

CRC Check Sum

1 2 ... 562 563 564 565 566 567 568 569 570 571 572 ... 720 721

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