Excluding Specified Ip Addresses From Assignment; Configuring A Lease Time For A Dhcp Address Pool - H3C S9500 Series Operation Manual

Operation Manual – DHCP
H3C S9500 Series Routing Switches
Remove an dynamic assignment
address range
By default, no IP address range is configured for dynamic IP address assignment.
Each DHCP address pool can be configured with only one address range. If you
execute the network command multiple times, then only the last configured address
range works.
Caution:
When addresses are obtained through a DHCP relay agent, the involved address pool,
global address pool with a static binding and the Relay agent's address must have the
same subnet mask. Otherwise, the binding will fail, or the addresses assigned to clients
will not be in the same network segment as the Relay agent.

2.1.3 Excluding Specified IP Addresses from Assignment

You can use the following command to prevent the DHCP server from assigning IP
addresses that are already occupied by such network devices as gateways and file
transfer protocol (FTP) servers to other DHCP clients to avoid IP address conflicts.
Perform the following configuration in system view to exclude specified IP addresses
from assignment:
Exclude specified IP addresses from
assignment
Cancel the forbiddance
All IP addresses in a DHCP address pool can be automatically assigned by default.
You can set multiple IP address ranges that cannot be assigned automatically by
executing the dhcp server forbidden-ip command multiple times.

2.1.4 Configuring a Lease Time for a DHCP Address Pool

You can configure different lease times for different DHCP address pools. But you can
configure only one lease time for one DHCP address pool and all the address in the
same pool will have the same lease time.
To do...
To do...
2-5
Chapter 2 DHCP Server Configuration
Use the command...
undo network
Use the command...
dhcp server forbidden-ip
low-ip-address [ high-ip-address ]
undo dhcp server forbidden-ip
low-ip-address [ high-ip-address ]