Zyxel IES-5112 [81/1156] Private format

Zyxel IES-5112 [81/1156] Private format
Chapter 4 Access Control List Screens
Management Switch Card User’s Guide
81
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.
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.
4.1.4.1 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.
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).
4.1.4.2 TR-101 Format
This format is the same as the TR-101 format for DHCP relay option 82; see Section 4.1.3 on page
80 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.
Table 13 PPPoE Intermediate Agent Vendor-specific Tag Format
Tag_Type
(0x0105)
Tag_Len Value i1 i2
Table 14 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 15 PPPoE Intermediate Agent Remote ID Sub-option Format
SubOpt
(0x02)
Length MAC
(6 bytes)

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