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IES-1248-51V User’s Guide

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CHAPTER 39

PPPoE Intermediate Agent

This chapter describes how the IES-1248-51V gives a PPPoE termination server

additional information that the server can use to identify and authenticate a PPPoE

client.

39.1 PPPoE Intermediate Agent Tag Formate

If the PPPoE Intermediate Agent is enabled, the IES-1248-51V 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.

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 IES-1248-51V supports two formats for the PPPoE intermediate

agent sub-options: private and TR-101.

39.1.0.1 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 95 PPPoE Intermediate Agent Vendor-specific Tag Format

Tag_Type

(0x0105)

Tag_Len Value i1 i2

Table 96 PPPoE Intermediate Agent Vendor-specific Tag Format

SubOpt

(0x01)

Length Slot ID

(1 byte)

Port No

(1 byte)

VLAN ID

(2 bytes)

Extra Information

(0~23 bytes)

Table 97 PPPoE Intermediate Agent Remote ID Sub-option Format

SubOpt

(0x02)

Length MAC

(6 bytes)

1 2 ... 290 291 292 293 294 295 296 297 298 299 300 ... 653 654

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