3Com 10014298 manual Configuring the Dhcp Server Group for the Vlan Interface

74CHAPTER 4: NETWORK PROTOCOL OPERATION

Table 69 Configure/Delete the IP Address of the DHCP Server

Operation	Command
Remove all the IP addresses of the DHCP	undo dhcp-server groupNo
Server (set the IP addresses of the primary and
secondary servers to 0).

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.

Table 70 Configure/Delete the Corresponding DHCP Server Group of VLAN Interface

Operation	Command
Configure the DHCP server group for the	dhcp-server groupNo
VLAN interface
Delete the DHCP server group for the VLAN	undo dhcp-server
interface

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.

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 }

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.

Table 72 Enable/Disable DHCP Security on VLAN Interfaces

Operation	Command
Enable DHCP security features	address-check enable
Disable DHCP security features on VLAN	address-check disable
interface