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3com WX3000 User Manual

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2-4 
Configuring the DHCP Relay Agent 
 
 
If a device belongs to an IRF fabric, you need to enable the UDP Helper function on it before configuring 
it as a DHCP relay agent. 
 
DHCP Relay Agent Configuration Task List 
Complete the following tasks to configure the DHCP relay agent: 
Task 
Remarks 
Required 
Optional 
Optional 
 
Correlating a DHCP Server Group with a Relay Agent Interface 
To enhance reliability, you can set multiple DHCP servers on the same network. These DHCP servers 
form a DHCP server group. When an interface of the relay agent establishes a correlation with the 
DHCP server group, the interface will forward received DHCP packets to all servers in the server group.  
Follow these steps to correlate a DHCP server group with a relay agent interface: 
To do… 
Use the command… 
Remarks 
Enter system view 
system-view 
— 
Configure the DHCP server IP 
address(es) in a specified 
DHCP server group 
dhcp-server groupNo ip 
ip-address&<1-8> 
Required 
By default, no DHCP server IP 
address is configured in a 
DHCP server group. 
interface interface-type 
interface-number 
Map an interface to a DHCP 
server group 
dhcp-server groupNo 
Required 
By default, a VLAN interface is 
not mapped to any DHCP 
server group.