(Optional) Configuring Option 82 - TP-Link T1600G-52TS User Manual

Configuring DHCP Service
Switch(config)#service dhcp relay
Switch(config)#show ip dhcp relay
Switch(config)#ip dhcp relay hops 5
Switch(config)#ip dhcp relay time 10
DHCP relay state: enabled
DHCP relay hops: 5
DHCP relay Time Threshold: 10 seconds
...
Switch(config)#end
Switch#copy running-config startup-config

3.2.2 (Optional) Configuring Option 82

Follow these steps to configure Option 82:
Step 1
Step 2
Step 3
Step 4
Step 5
configure
Enter Global Configuration Mode.
interface { fastEthernet port | range fastEthernet port-list | gigabitEthernet port | range
gigabitEthernet port-list | ten-gigabitEthernet port | range ten-gigabitEthernet port-list }
Enter Interface Configuration Mode.
ip dhcp relay information option
Enable the Option 82 feature on the port.
ip dhcp relay information strategy { keep | replace | drop }
Specify the operation for the switch to take when receiving DHCP packets that include the
Option 82 field.
keep: The switch keeps the Option 82 field of the packets.
replace: The switch replaces the Option 82 field of the packets with a new one. The switch
presets a default circuit ID and remote ID in TLV (Type, Length, and Value) format. You can
also configure the format to include Value only and customize the Value.
drop: The switch discards the packets that include the Option 82 field.
ip dhcp relay information format { normal | private }
Specify the packet format for the sub-option fields of Option 82.
normal: Indicates the fields consist of three parts: Type, Length, and Value (TLV).
private: Indicates the fields consist of the value only.
DHCP Relay Configuration
User Guide 454