Pppoe Intermediate Agent; Pppoe Intermediate Agent Tag Formate; Table 91 Pppoe Intermediate Agent Vendor-Specific Tag Format; Table 92 Pppoe Intermediate Agent Vendor-Specific Tag Format - ZyXEL Communications IES-1248-51V User Manual

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H A P T E R

PPPoE Intermediate Agent

This chapter describes how the IES 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 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 91 PPPoE Intermediate Agent Vendor-specific Tag Format

Tag_Type
(0x0105)
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 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 92 PPPoE Intermediate Agent Vendor-specific Tag Format

SubOpt
(0x01)

Table 93 PPPoE Intermediate Agent Remote ID Sub-option Format

SubOpt
(0x02)
IES-1248-51V User's Guide
Tag_Len Value
Length Slot ID
(1 byte)
Length MAC
(6 bytes)
i1
Port No VLAN ID
(1 byte) (2 bytes)
39
i2
Extra Information
(0~23 bytes)
305