Zyxel VES-1624FT-55A [225/312] Pppoe intermediate agent tag format

Zyxel VES-1624FT-55A [225/312] Pppoe intermediate agent tag format
VES-1624FT-55A User’s Guide
225
CHAPTER 41
PPPoE Intermediate Agent
This chapter describes how the IP DSLAM gives a PPPoE termination server additional
information that the server can use to identify and authenticate a PPPoE client.
41.1 PPPoE Intermediate Agent Tag Format
If the PPPoE Intermediate Agent is enabled, the IP DSLAM 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 IP DSLAM
supports two formats for the PPPoE intermediate agent sub-options: private and TR-101.
41.1.0.1 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.
The IP DSLAM 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 IP DSLAM 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 IP DSLAM adds extra information, it does not append a trailing 0x00 (00h).
Table 85 PPPoE Intermediate Agent Vendor-specific Tag Format
Tag_Type
(0x0105)
Tag_Len Value i1 i2
Table 86 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 87 PPPoE Intermediate Agent Remote ID Sub-option Format
SubOpt
(0x02)
Length MAC
(6 bytes)

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