Switch 7700 Configuration Guide, v2

DHCP Relay 53
Note: The backup server IP address cannot be configured independently, instead,
it has to be configured together with the master server IP address.
The corresponding IP address of the DHCP Server is not configured by default. The
DHCP Server address must be configured before DHCP relay can be used.
Configure Corresponding DHCP Server Group of 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.
No VLAN interface corresponds to a DHCP server group, by default.
Configure 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.
Enable/Disable 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.
By default, the DHCP security features function is disabled.
Displaying and
Debugging DHCP Relay
After the above configuration, execute display command in all views to display the
running of the DHCP Relay configuration, and to verify the effect of the
Table 8 Configure/Delete the Corresponding DHCP Server Group of VLAN Interface
Operation Command
Configure Corresponding DHCP
Server Group of the VLAN Interface
dhcp-server groupNo
Delete the corresponding DHCP
server group of the VLAN interface
undo dhcp-server
Table 9 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
Table 10 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