Tripp Lite NGI-M08C4POE8-2 Owner's Manual page 135

Option Frame Format:
Code Len
82 N
The Agent Information field consists of a sequence of Sub-Opt/Length value for each sub-
option, encoded in the following manner:
Sub-Option Len
1 N
DHCP Agent
Sub-Option Code
---------------
1
2
Circuit ID Sub-Option Format:
Sub-option Length
Type
0x01
Remote ID Sub-Option Frame Format:
Sub-option Length
Type
0x02 8
Circuit Form:
The circuit form is a flexible architecture. It allows user to combine any information or the system
configurations into the circuit sub-option.
The Circuit Form is a string format. And its maximum length is 100 characters.
The keyword, %SPACE, will be replaced with a space character.
The other keywords get system configurations from the system and then replace the keyword and
its leading code in the Circuit form. Eventually, the content of the circuit form is part of the
payload on the DHCP option 82 packet.
Rules:
The keyword must have a leading code '%'. For example: %HOSTNAME.

If there are any characters following the keywords, you must add '+' between the

keyword and character. For example: %HOSTNAME+/.
If there are any characters before the keyword, you must add '+' between the character

and the keyword. For example: Test+%HOSTNAME.
Keyword:
HOSTNAME - Add the system name into the Circuit sub-option..
SPACE - Add a space character.
SVLAN - Add the service provider VLAN ID into the Circuit sub-option.
If the service provider VLAN is not defined, the system will return
Agent Information Field
i1 i2
s1 s2
Sub-Option Description
----------------------
Agent Circuit ID Sub-option
Agent Remote ID Sub-option
Information
Circuit Form
Type Length
0 6
135
i3 i4 . . .
Sub-Option Value
s3 s4
MAC Address
6
iN
. . . sN