TP-Link T1600G-18TS Configuration Manual page 439

Configuring DHCP
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The following example shows how to enable Option 82 and configure the process of Option
82 information as keep:
Switch#configure
Switch(config)#ip dhcp relay information
Switch(config)#ip dhcp relay information policy keep
configure
Enter global configuration mode.
ip dhcp relay information
Enable the Option 82 feature.
ip dhcp relay information policy { keep | replace | drop }
Configure how to process Option 82 information.
keep: The switch will keep the Option 82 information in the packet.
replace: The switch will replace the Option 82 information with the customized
configurations on the switch.
drop: The switch will drop the packets carrying Option 82 information
ip dhcp relay information custom
Enable the Customization feature of Option 82.
ip dhcp relay information circuit-id circuit-id
If the Customization feature is enabled, specify the circuit ID.
Specify the circuit ID with 1 to 63 characters including digits, English letters and
circuit-id:
underlines.
ip dhcp relay information remote-id remote-id
If the Customization feature is enabled, specify the remote ID.
Specify the remote ID with 1 to 32 characters including digits, English letters and
remote-id:
underlines.
show ip dhcp relay
Verify the configuration of DHCP Relay.
end
Return to Privileged EXEC Mode.
copy running-config startup-config
Save the settings in the configuration file.
DHCP Relay Configuration
Configuration Guide 416