Configuring Option 82 - Allied Telesis AT-8600 Series How To Use Manual

Analysis
The following table provides an analysis of the strings in the above DHCP Request packet
extract:
Text Colour
Green
Blue
Red
The Agent circuit ID string 00 30 00 05 translates as:
30 = vlan48
05 = switch port 5

Configuring Option 82

Different commands are used to turn on Option 82 depending on whether the switch is
performing DHCP snooping or DHCP relay. For the DHCP snooping, the command is:
enable dhcpsnooping option82
The subscriber ID to be used on any given port can be set using the command:
set dhcpsnooping port=x subscriberid="xxxx"
If the switch is acting as a DHCP relay and there is no requirement to also maintain a DHCP
snooping database, then the DHCP relay process can be configured to insert option 82
information into the relayed packets:
enable bootp relay option82
The subscriber ID to be used on any given port can be configured with:
set bootp relay option82 subscriberid="xxxx"
Note:
Agent Circuit ID and Agent Remote ID are sub-options that are also sent as part of the
Option 82 data but they are not configurable.
Page 10 | AlliedWare™ OS How To Note: DHCP Snooping on Rapier-style switches
Analysis
This is the Agent Circuit ID
This is the Agent
This is the subscriber ID sub-option
The use of BOOTP relay without DHCP snooping will not be discussed any further
in this document.
DHCP Option 82