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If a switch belongs to an XRN 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
Enabling DHCP Required
Correlating a DHCP Server Group with a Relay Agent Interface Required
Configuring DHCP Relay Agent Security Functions Optional
Configuring the DHCP Relay Agent to Support Option 82 Optional
Enabling DHCP
Make sure to enable DHCP before you perform other DHCP relay-related configurations, since other
DHCP-related configurations cannot take effect with DHCP disabled.
Follow these steps to enable DHCP:
To do… Use the command… Remarks
Enter system view
system-view
—
Enable DHCP
dhcp enable
Required
Enabled by default.
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.