A DHCP request is from Port 2 that is marked as Opt82 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.
4.4.12.2 DHCP Option 82 Configuration
The Managed Switch adds the option 82 information in the packet when it receives the DHCP
request. In general, the switch MAC address(the remote-ID suboption) and the port identifier, vlan-
mod-port or snmp-ifindex are included in the option 82 information. You can configure the remote
ID and circuit ID. Click DHCP Opt82 Configuration from the Security Configuration and the
following screen page appear.
Circuit ID Suboption: This suboption may be added by DHCP relay agents that terminate
switched or permanent circuits. It encodes an agent-local identifier of the circuit from which a
DHCP client-to-server packet was received. It is intended for use by agents in relaying DHCP
responses back to the proper circuit. Servers may use the Circuit ID for IP and other parameter
assignment policies.
Remote ID Suboption: This suboption may be added by DHCP relay agents that terminate
switched or permanent circuits and have machanisms to identify the remote host end of the circuit.
DHCP servers may use this option to select parameters specific to particular users, hosts, or
subscriber modems. The relay agent may use this field in addition to or instead of the Agent
Circuit ID field to select the circuit on which to forward the DHCP reply.
Click on the checkbox of the corresponding port number you would like to configure with circuit ID.
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