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Chapter 46  DHCP Relay Commands 
A DHCP Relay is a Layer 3 device that forwards DHCP packets between clients and servers. 
DHCP Relay forward requests and replies between clients and servers when they are not on the 
same physical subnet. 
46.1 service dhcp relay 
Description 
The  service  dhcp relay  command is used to enable DHCP Relay function 
globally. To  disable DHCP Relay function, please use no  service  dhcp relay 
command. 
Syntax 
service dhcp relay 
no service dhcp relay 
Command Mode 
Global Configuration Mode 
Privilege Requirement 
Only Admin, Operator and Power User level users have access to these 
commands. 
Example 
Enable DHCP Relay function globally: 
T2600G-28TS(config)# service dhcp relay 
46.2 ip helper-address 
Description 
The ip helper-address command is used to add DHCP Server address to the 
Layer 3 interface. To delete the server address, please use no ip 
helper-address command. 
Syntax 
ip helper-address ip-address 
no ip helper-address [ ip-address ] 
Parameter 
ip-address —— DHCP Server address.