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74 CHAPTER 4: NETWORK PROTOCOL OPERATION
The backup server IP address cannot be configured independently, instead, it has
to be configured together with the master server IP address.
By default, the IP address of the DHCP Server is not configured. The DHCP Server
address must be configured before DHCP relay can be used.
Configuring the DHCP Server Group for the VLAN Interface
Perform the following configuration in VLAN interface view.
When associating a VLAN interface to a new DHCP server group, you can
configure the association without disassociating it from the previous group.
By default, VLAN interfaces have no associated DHCP server group.
Configuring the Address Table Entry
To check the address of users who have valid and fixed IP addresses in the VLAN
(with DHCP enabled), it is necessary to add an entry in the static address table.
Perform the following configuration in system view.
Enabling/Disabling DHCP Security Features
Enabling DHCP security features starts an address check on the VLAN interface,
while disabling DHCP security features cancels an address check.
Perform the following configuration in VLAN interface view.
Remove all the IP addresses of the DHCP
Server (set the IP addresses of the primary and
secondary servers to 0).
undo dhcp-server groupNo
Table 70 Configure/Delete the Corresponding DHCP Server Group of VLAN Interface
Operation Command
Configure the DHCP server group for the
VLAN interface
dhcp-server groupNo
Delete the DHCP server group for the VLAN
interface
undo dhcp-server
Table 71 Configure/Delete the Address Table Entry
Operation Command
Add an entry to the address table dhcp-security static ip_address
mac_address { dynamic | static }
Delete an entry from the address table undo dhcp-security { ip_address |
all | dynamic | static }
Table 72 Enable/Disable DHCP Security on VLAN Interfaces
Operation Command
Enable DHCP security features address-check enable
Disable DHCP security features on VLAN
interface
address-check disable
Table 69 Configure/Delete the IP Address of the DHCP Server
Operation Command