H3C S9500 Series Operation Manual page 88

Operation Manual – DHCP
H3C S9500 Series Routing Switches
Note that when configuring a new DHCP server for a VLAN interface, the newly
configured one does not overwrite the existing ones. Both the new and the old ones are
valid. You can configure up to 20 DHCP server addresses for a VLAN interface.
Caution:
The IP address of a specified DHCP server cannot be the IP address of the VLAN
interface where the DHCP relay agent resides.
II. Configuring client address entries for a DHCP relay agent
In a VLAN that has DHCP Relay agent configured, to enable a DHCP client using a
legal fixed IP address to pass the address checking of the DHCP relay agent security
feature, you must add a static address entry for the DHCP client. A static address entry
is a binding between a fixed IP address and a MAC address.
Perform the following configuration in system or VLAN interface view to configure an
IP-MAC entry of a client on the DHCP relay agent:
Add a user address entry for DHCP relay
Remove a user address entry for DHCP
relay
To do...
3-3
Chapter 3 DHCP Relay Agent Configuration
Use the command...
dhcp relay security ip-address
mac-address static
undo dhcp relay security ip-address