HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Services Configuration G - Page 43

subnet and multiple secondary subnets in a DHCP address pool, which are consistent with the subnets

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request, the DHCP server selects an address from the primary subnet. If no assignable address is found, the server selects an address from the secondary subnets in the order they are configured. In scenarios where the DHCP server and the DHCP clients reside on different subnets and the DHCP clients obtain IP addresses through a DHCP relay agent, the DHCP server needs to use the same address pool to assign IP addresses to clients in different subnets. To satisfy this need, you can specify a primary subnet and multiple secondary subnets in a DHCP address pool, which are consistent with the subnets where the relay agent interfaces reside. Upon receiving a DHCP request forwarded by a relay agent, the DHCP server reads the giaddr field in the request to find the corresponding subnet and selects an IP address for the client. Follow these guidelines when you specify a primary subnet and secondary subnets for a DHCP address pool: • You can specify only one primary subnet in each address pool. If you use the network command multiple times, the most recent configuration takes effect. • 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: Step 1. Enter system view. 2. Enter address pool view. Command system-view dhcp server ip-pool pool-name Remarks N/A 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 5. (Optional.) Return to address pool view. quit By default, no secondary subnet is specified. N/A 6. (Optional.) Specify the address lease duration. expired { day day [ hour hour [ minute minute [ second second ] ] ] The default setting is one day. | unlimited } 7. (Optional.) Exclude the specified IP addresses from dynamic allocation. forbidden-ip ip-address& 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 34

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34
request, the DHCP server selects an address from the primary subnet. If no assignable address is found,
the server selects an address from the secondary subnets in the order they are configured.
In scenarios where the DHCP server and the DHCP clients reside on different subnets and the DHCP
clients obtain IP addresses through a DHCP relay agent, the DHCP server needs to use the same address
pool to assign IP addresses to clients in different subnets. To satisfy this need, you can specify a primary
subnet and multiple secondary subnets in a DHCP address pool, which are consistent with the subnets
where the relay agent interfaces reside. Upon receiving a DHCP request forwarded by a relay agent, the
DHCP server reads the
giaddr
field in the request to find the corresponding subnet and selects an IP
address for the client.
Follow these guidelines when you specify a primary subnet and secondary subnets for a DHCP address
pool:
•
You can specify only one primary subnet in each address pool. If you use the
network
command
multiple times, the most recent configuration takes effect.
•
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:
Step
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