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Relay Agent: To enable or disable DHCP Option 82 Relay Agent Global setting. When
enabled, Relay Agent Information option is inserted by the DHCP relay agent when
forwarding client-originated DHCP packets to a DHCP server. Servers recognizing the Relay
Agent Information option may use the Information to implement IP address or other
parameter assignment policies. Switch or Router (as the DHCP relay agent) intercepting the
DHCP requests, appends the circuit ID + remote ID into the option 82 fields and forwards
the request message to DHCP server.
Opt82 Port: By default, port 1~24 are Opt82-enabled ports.
Trust Port: Tick the checkbox on ports that you would like them to become trust ports. The
trusted ports will not discard DHCP messages.
For example:
A DHCP request is from Port 1 that is marked as both Opt 82 port and trust port.
A. If a DHCP request is with Opt 82 Agent information and then the Managed Switch will
forward it.
B. If a DHCP request is without Opt82 Agent information and then the Managed Switch will
add Opt82 Agent information an forward it.
A DHCP request is from Port 2 that is marked as Opt 82 port.
A. If a DHCP request is with Opt82 Agent information and then the Managed Switch will
drop it because it is not marked as a trust port.
B. If a DHCP request is without Opt82 Agent information and then the Managed Switch will
add Opt82 Agent information and then forward it.
4.3.13.2 DHCP Port Settings
Select the option DHCP Port Settings from the Security Configuration menu and then the
following screen page appears.