TP-Link T1600G-18TS Configuration Manual page 441

Configuring DHCP
Step 5
Step 6
The following example shows how to configure the DHCP server address as 192.168.1.7
on VLAN interface 66:
Switch#configure
Switch(config)#interface vlan 66
Switch(config-if)#ip helper-address 192.168.1.7
Switch(config-if)#show ip dhcp relay
......
DHCP relay helper address is configured on the following interfaces:
Interface
----------
VLAN 66
Switch(config-if)#end
Switch#copy running-config startup-config
 DHCP VLAN Relay
Only T1600G-18TS supports this feature.
Follow these steps to configure DHCP VLAN Relay:
Step 1
end
Return to Privileged EXEC Mode.
copy running-config startup-config
Save the settings in the configuration file.
Helper address
--------------
192.168.1.7
configure
Enter global configuration mode.
DHCP Relay Configuration
Configuration Guide 418