3Com 3031 Command Reference Manual page 413

dhcp server forbidden-ip
Description
Using the dhcp server expired command in system view, you can configure a valid
period allowed for leasing IP addresses in the interface DHCP address pool of the
interfaces in a specified range. Using the undo dhcp server expired command in
system view, you can restore the default setting.
By default, the leasing valid period is one day.
After configuring this command, you cannot view the configuration by executing
the display current-configuration command. By calling the dhcp server expired
command respectively on the specified interfaces, you can fulfill the batch
configurations of the command.
For the related commands, see dhcp server ip-pool, dhcp server expired (in
interface view), and expired.
Example
Set the valid period for leasing IP addresses in the interface address pool of the
interfaces in the range of Ethernet2/0/0.1 to Ethernet2/0/0.5 to unlimited.
[3Com] dhcp server expired unlimited interface ethernet 2/0/0.1 to
ethernet 2/0/0.5
Syntax
dhcp server forbidden-ip low-ip-address [ high-ip-address ]
undo dhcp server forbidden-ip low-ip-address [ high-ip-address ]
View
System view
Parameter
low-ip-address: The low IP address that does not participate in the
auto-allocation.
high-ip-address: The high IP address that does not participate in the
auto-allocation. It must belong to the same segment to which the
low-ip-address belongs as well and must not be smaller than the
low-ip-address. If this parameter is not specified, there will be only one IP
address, i.e., low-ip-address.
Description
Using the dhcp server forbidden-ip command, you can exclude IP addresses in a
specified range to participate in the auto-allocation. Using the undo dhcp server
forbidden-ip command, you can delete the configuration.
By default, all the IP addresses in address pools participate in the auto-allocation.
You can configure multiple IP address ranges that do not participate in the
auto-allocation. Before using the undo dhcp server forbidden-ip command to
delete the setting, you must make sure that you are using exactly the same
parameters that you have configured. In other words, you cannot delete only
some addresses from the configured range.
For the related commands, see dhcp server ip-pool, network, and static-bind
ip-address.
DHCP Server Configuration Commands 413