Pppoe Intermediate Agent - ZyXEL Communications MSC1024G Series User Manual

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TR-101 uses the same remote ID sub-option format as the Private format.

5.1.4 PPPoE Intermediate Agent

You must use CLI commands to configure this feature.

This section describes how the MSC gives a PPPoE termination server additional information

that the server can use to identify and authenticate a PPPoE client.

If the PPPoE Intermediate Agent is enabled, the MSC adds a vendor-specific tag to PADI

(PPPoE Active Discovery Initialization) and PADR (PPPoE Active Discovery Request)

packets from PPPoE clients. This tag is defined in RFC 2516 and has the following format for

this feature.

Table 11 PPPoE Intermediate Agent Vendor-specific Tag Format

The Tag_Type is 0x0105 for vendor-specific tags, as defined in RFC 2516. The Tag_Len

indicates the length of Value, i1 and i2. The Value is the 32-bit number 0x00000DE9, which

stands for the "ADSL Forum" IANA entry. i1 and i2 are PPPoE intermediate agent sub-

options, which contain additional information about the PPPoE client. The MSC supports two

formats for the PPPoE intermediate agent sub-options: private and TR-101.

5.1.4.1 Private Format

There are two types of sub-option: "Agent Circuit ID Sub-option" and "Agent Remote ID

Sub-option". They have the following formats.

Table 12 PPPoE Intermediate Agent Vendor-specific Tag Format

Table 13 PPPoE Intermediate Agent Remote ID Sub-option Format

The MSC adds the slot ID of the PPPoE client, the port number of the PPPoE client, the

VLAN ID on the PPPoE packet, and any extra information (for example, the device name)

into the Agent Circuit ID Sub-option. In addition, the MSC puts the PPPoE client's MAC

address into the Agent Remote ID Sub-option. The slot ID is zero, if this value is not

applicable. If the MSC adds extra information, it does not append a trailing 0x00 (00h).

5.1.4.2 TR-101 Format

This format is the same as the TR-101 format for DHCP relay option 82; see

for more information.

Unlike the private format for PPPoE intermediate agent, the TR-101 format for PPPoE

intermediate agent does not include the Remote ID Sub-option.

MSC1000G/1024G/1224G Series User's Guide

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