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Usage guidelines
The DHCP server assigns an IP address together with the lease duration to the DHCP client. Before
the lease expires, the DHCP client must extend the lease duration.
• If the lease extension operation succeeds, the DHCP client can continue to use the IP address.
• If the lease extension operation does not succeed, both of the following events occur:
{ The DHCP client cannot use the IP address after the lease duration expires.
{ The DHCP server will label the IP address as an expired address.
Examples
# Set the lease duration to 1 day, 2 hours, 3 minutes, and 4 seconds in DHCP address pool 0.
<Sysname> system-view
[Sysname] dhcp server ip-pool 0
[Sysname-dhcp-pool-0] expired day 1 hour 2 minute 3 second 4
Related commands
display dhcp server expired
display dhcp server pool
reset dhcp server expired
forbidden-ip
Use forbidden-ip to exclude IP addresses from dynamic allocation in an address pool.
Use undo forbidden-ip to remove the configuration.
Syntax
forbidden-ip ip-address&<1-8>
undo forbidden-ip [ ip-address&<1-8> ]
Default
No IP addresses are excluded from dynamic allocation in an address pool.
Views
DHCP address pool view
Predefined user roles
network-admin
Parameters
ip-address&<1-8>: Specifies a space-separated list of up to eight excluded IP addresses.
Usage guidelines
The excluded IP addresses in an address pool are still assignable in other address pools.
You can exclude a maximum of 4096 IP addresses in an address pool by executing this command
multiple times.
If you do not specify any parameters, the undo forbidden-ip command removes all excluded IP
addresses.
Examples
# Exclude IP addresses 192.168.1.3 and 192.168.1.10 from dynamic allocation in DHCP address
pool 0.
<Sysname> system-view
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