The subnet of the pool cannot be overlapped with that of other pools.

<Huawei>sys
Enter system view, return user view with Ctrl+Z.
[Huawei]vlan batch 500 501
Info: This operation may take a few seconds. Please wait for a moment...done.
[Huawei]un in en
Info: Information center is disabled.
[Huawei]int vlanif 500

[Huawei-Vlanif500]ip add 192.168.200.1 28
[Huawei-Vlanif500]int vlanif 501
[Huawei-Vlanif501]ip add 192.168.200.17 27
Info: A similar IP subnet already exists. Please verify the current IP subnet design.
[Huawei-Vlanif501]dis th
#
interface Vlanif501
 ip address 192.168.200.17 255.255.255.224
#
return
[Huawei-Vlanif501]q
[Huawei]ip pool 500
Info:It's successful to create an IP address pool.
[Huawei-ip-pool-500]gate    
[Huawei-ip-pool-500]gateway-list 192.168.200.1
[Huawei-ip-pool-500]net    
[Huawei-ip-pool-500]network 192.168.200.0 mask 255.255.255.240
[Huawei-ip-pool-500]q
[Huawei]ip pool 501
Info:It's successful to create an IP address pool.
[Huawei-ip-pool-501]gateway-list 192.168.200.17
[Huawei-ip-pool-501]network 192.168.200.16 mask 255.255.255.224
Error:The subnet of the pool cannot be overlapped with that of other pools.

 

Subnet partition

①、 Determine the length of the subnet mask .

②、 Determine the available address range of the host under the subnet （ The first one is available IP And the last one available IP）.

③、 Determine the network address （ All hosts are 0） And broadcast address （ All hosts are 1）, Cannot assign computer host to .

Division of constant length subnet and variable length subnet

Subnets are divided into equal length subnets and variable length subnets , The latter is relatively flexible .

1、 Equal length subnet division

Equal length subnet division is to divide a class network into multiple networks , That is, it is equally divided into multiple subnets , All subnets have the same subnet mask .

2、 Division of variable length subnet

VLSM It specifies how to divide subnets in a network , Different subnets use different subnet masks . This is very effective when different segments of the network need different big and small networks , This method of subnet division is called variable length subnet division .

The division of variable length subnet is actually the division of equal length subnet , Take one or more subnets in different molecular networks .

This is error reporting The subnet of the pool cannot be overlapped with that of other pools Why ！！！