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Chapter 28 DHCP Relay

IES-1248-51V User’s Guide

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and optional information about the slot and port on which the DHCP request was

received.

The following table shows the format of the private Agent Circuit ID sub-option.

The (binary) “1” in the first field identifies this as an Agent Circuit ID sub-option.

The length N gives the total number of octets in the Agent Information Field. If

the configuration request was received on a DSL port, a 1-byte Slot No field

specifies the ingress slot number, and a 1-byte Port No field specifies the ingress

port number (both in hexadecimal format). The next field is 2 bytes and displays

the DHCP request packet’s VLAN ID. The last field (A) can range from 1 to 24

bytes (including a one-byte termination character) and is optional information

(that you specify) about this relay agent.

The Agent Information field that the device adds also contains an “Agent Remote-

ID sub-option” of information that you specify.

The following table shows the format of the private Agent Remote ID sub-option.

The “2” in the first field identifies this as an Agent Remote ID sub-option. The

length N gives the total number of octets in the Agent Information Field. Next, the

extra information field (A in the table) contains from 0 to 23 bytes of optional

information (that you specify) with no spaces and no termination character (if you

do not specify any information, this field contains no data). Next, there is a space

and the letters “eth” followed by another space. Then there is the slot number and

port number (in plain text format) upon which the DHCP client request was

received. This is followed by a colon (:), the VLAN ID (VID) number, a period (.)

and the MAC address (in hexadecimal format).

28.2.2 TR-101 Format

The Agent Information field that the IES-1248-51V adds contains an “Agent

Circuit-ID sub-option” that 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 Agent Circuit ID 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

Table 57 DHCP Relay Agent Circuit ID Sub-option Format: Private

1NSlot No Port No VLAN ID A

Table 58 DHCP Relay Agent Remote ID Sub-option Format: Private

2N A“ eth

“

Slot No. / Port No. : VLAN ID . MAC

1 2 ... 213 214 215 216 217 218 219 220 221 222 223 ... 653 654

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