Dhcp Relay Agent Configuration Task List; Enabling Dhcp; Correlating A Dhcp Server Group With A Relay Agent Interface - 3Com E4500-24 Cli Configuration Manual

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:

Enabling DHCP

Correlating a DHCP Server Group with a Relay Agent Interface

Configuring DHCP Relay Agent Security Functions
Configuring the DHCP Relay Agent to Support Option 82
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...
Enter system view
Enable DHCP
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...
Enter system view
Configure the DHCP server IP
address(es) in a specified
DHCP server group
Map an interface to a DHCP
server group
Task
Use the command...
system-view
dhcp enable
Use the command...
system-view
dhcp-server groupNo ip
ip-address&<1-8>
interface interface-type
interface-number
dhcp-server groupNo
3-4
Remarks
Required
Required
Optional
Optional
Remarks
—
Required
Enabled by default.
Remarks
—
Required
By default, no DHCP server IP
address is configured in a
DHCP server group.
Required
By default, a VLAN interface is
not mapped to any DHCP
server group.