H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – DHCP
H3C S7500E Series Ethernet Switches Chapter 3 DHCP Relay Agent Configuration
3-4
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.
3.3.2 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.
 Note:
If the DHCP client obtains an IP address via the DHCP relay agent, the address pool of
the subnet which the IP address of the DHCP relay agent belongs to must be
configured on the DHCP server. Otherwise, the DHCP client cannot obtain a correct IP
address.
3.3.3 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: