Option 82 configuration example

As shown in Figure 28, the DHCP relay agent (Router A) replaces Option 82 in DHCP requests before forwarding them to the DHCP server (Router B).

• The Circuit ID sub-option is company001.

• The Remote ID sub-option is device001.

To use Option 82, you must also enable the DHCP server to handle Option 82.

# Specify IP addresses for the interfaces. (Details not shown.)

# Enable DHCP.

<RouterA> system-view
[RouterA] dhcp enable

# Enable the DHCP relay agent on GigabitEthernet 1/0/1.

[RouterA] interface gigabitethernet 1/0/1
[RouterA-GigabitEthernet1/0/1] dhcp select relay

# Specify the IP address of the DHCP server on the relay agent.

[RouterA-GigabitEthernet1/0/1] dhcp relay server-address 10.1.1.1

# Enable the DHCP relay agent to handle Option 82, and perform Option 82 related configuration.

[RouterA-GigabitEthernet1/0/1] dhcp relay information enable
[RouterA-GigabitEthernet1/0/1] dhcp relay information strategy replace
[RouterA-GigabitEthernet1/0/1] dhcp relay information circuit-id string company001
[RouterA-GigabitEthernet1/0/1] dhcp relay information remote-id string device001