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101

Chapter 39 PPPoE Intermediate Agent

IES-1248-51V User’s Guide

296

The IES-1248-51V 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

IES-1248-51V 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 IES-1248-51V adds

extra information, it does not append a trailing 0x00 (00h).

39.1.0.2 TR-101 Format

The PPPoE Intermediate Agent sub-option includes the system name or IP

address, slot ID, port number, VPI, and VCI on which the TCP/IP configuration

request was received.

The following figure shows the format of the TR-101 PPPoE Intermediate Agent

sub-option. The 1 in the first field identifies this as an Agent Circuit ID sub-option.

The next field specifies the length of the field. The hostname field displays the

system name, if it has been configured, the extra information field (A) if the

hostname was not configured, or the IP address in dotted decimal notation

(w.x.y.z), if neither the system name nor the extra information field was been

configured. In either case, the hostname is truncated to 23 characters, and

trailing spaces are discarded. The hostname field is followed by a space, the string

“atm”, and another space. Then, a 1-byte Slot ID field specifies the ingress slot

number, and a 1-byte Port No field specifies the ingress port number. Next, the

VPI and VCI denote the virtual circuit that received the DHCP request message

from the subscriber. If the VID is turned on, there is a colon and then the VLAN ID

(1 ~ 4094). If the VID is turned off, there is neither colon nor VID.

The slot ID, port number, VPI, VCI and MAC are separated from each other by a

forward slash (/) colon (:) or period (.). An example is “SYSNAME atm 3/

10:0.33:12”.

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 98 PPPoE Intermediate Agent Sub-option Format: TR-101 (VID on)

1Nhostname / A /

“ atm

“

Slot ID / Port No. : VPI . VCI : VLAN ID

Table 99 PPPoE Intermediate Agent Sub-option Format: TR-101 (VID off)

1Nhostname / A /

“ atm

“

Slot ID / Port No. : VPI . VCI

1 2 ... 291 292 293 294 295 296 297 298 299 300 301 ... 653 654

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