R21xx-HP FlexFabric 11900 Layer 3 IP Services Configuration Guide

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• You can specify a maximum of 32 secondary subnets in each address pool.
• IP addresses specified by the forbidden-ip command are not assignable in the current address pool,
but are assignable in other address pools. IP addresses specified by the dhcp server forbidden-ip
command are not assignable in any address pool.
To specify a primary subnet and secondary subnets for a DHCP address pool:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter address pool view.
dhcp server ip-pool pool-name N/A
3. Specify the primary subnet.
network network-address
[ mask-length | mask mask ]
By default, no primary subnet
is specified.
4. (Optional.) Specify a secondary
subnet.
network network-address
[ mask-length | mask mask ]
secondary
By default, no secondary
subnet is specified.
5. (Optional.) Return to address pool
view.
quit N/A
6. (Optional.) Specify the address
lease duration.
expired { day day [ hour hour
[ minute minute [ second second ] ] ]
| unlimited }
The default setting is one day.
7. (Optional.) Exclude the specified
IP addresses from dynamic
allocation.
forbidden-ip ip-address&<1-8>
By default, all the IP
addresses in the DHCP
address pool can be
dynamically allocated.
To exclude multiple address
ranges from the address pool,
repeat this step.
8. Return to system view.
quit N/A
9. (Optional.) Exclude the specified
IP addresses from dynamic
allocation globally.
dhcp server forbidden-ip
start-ip-address [ end-ip-address ]
Except for the IP address of
the DHCP server interface, IP
addresses in all address pools
are assignable by default.
To exclude multiple address
ranges globally, repeat this
step.
Configuring a static binding in a DHCP address pool
Some DHCP clients, such as a WWW server, need fixed IP addresses. To provide a fixed IP address for
such a client, you can statically bind the MAC address or ID of the client to an IP address in a DHCP
address pool. When the client requests an IP address, the DHCP server assigns the IP address in the static
binding to the client.
Follow these guidelines when you configure a static binding:
• One IP address can be bound to only one client MAC or client ID. You cannot modify bindings that
have been created. To change the binding for a DHCP client, you must delete the existing binding
first.