3Com Switch 7700 Configuration Manual page 74

66 C 4: N
HAPTER ETWORK
Example: Configuring
DHCP Relay
P O
ROTOCOL PERATION
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 10 Configure/Delete the Address Table Entry
Operation
Add an entry to the address table
Delete an entry from the address table
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 11 Enable/Disable DHCP Security on VLAN Interfaces
Operation
Enable DHCP security features
Disable DHCP security features on VLAN
interface
By default, DHCP security features function are disabled.
Displaying and Debugging DHCP Relay
Execute display command in all views to display the current DHCP Relay
configuration, and to verify the effect of the configuration. Execute the
debugging command in user view to debug DHCP Relay configuration.
Table 12 Displaying and Debugging DHCP Relay
Operation
Display the information about the DHCP
server group
Display the information about the DHCP
server group corresponding to the VLAN
interface.
Enable DHCP relay debugging
Disable DHCP relay debugging
Display address information for all the legal
clients of the DHCP Server group.
Configure the VLAN interface corresponding to the user and the related DHCP
server so as to use DHCP relay.
Command
dhcp-security static ip_address mac_address
{ dynamic | static }
undo dhcp-security { ip_address | all |
dynamic | static }
Command
address-check enable
address-check disable
Command
display dhcp-server groupNo
display dhcp-server interface
vlan-interface vlan-id
debugging dhcp-relay
undo debugging dhcp-relay
display dhcp-security [ ip_address |
dynamic | static ]