H3C Technologies H3C S7500E Series Switches - Manual (Page 69)

6-4
Configuring the DHCP Relay Agent
Enabling DHCP
Enable DHCP before performing other DHCP-related configurations.
Follow these steps to enable DHCP:
To do… Use the command… Remarks
Enter system view system-view —
Enable DHCP dhcp enable
Required
Disabled by default.
Enabling the DHCP Relay Agent on an Interface
With this task completed, upon receiving a DHCP request from the enabled interface, the relay agent
will forward the request to a DHCP server for address allocation.
Follow these steps to enable the DHCP relay agent on an interface:
To do… Use the command… Remarks
Enter system view system-view —
Enter interface view
interface interface-type
interface-number
—
Enable the DHCP relay agent on
the current interface
dhcp select relay
Required
With DHCP enabled, interfaces
work in the DHCP server mode.
If the DHCP client obtains an IP address via the DHCP relay agent, the address pool of the subnet to
which the IP address of the DHCP relay agent belongs must be configured on the DHCP server.
Otherwise, the DHCP client cannot obtain a correct IP address.
Correlating a DHCP Server Group with a Relay Agent Interface
To improve reliability, you can specify several DHCP servers as a group on the DHCP relay agent and
correlate a relay agent interface with the server group. When the interface receives requesting
messages from clients, the relay agent will forward them to all the DHCP servers of the group.
Follow these steps to correlate a DHCP server group with a relay agent interface: