(Optional) Configuring the Range of IP Addresses in an Address Pool

Context

This configuration allows you to determine the scope of IP addresses that a DHCP server can allocate.

Procedure

Configure a range in an interface address pool:
1. Enter the system view.
```
system-view 
```
2. Enter the interface or sub-interface view.
```
interface interface-type interface-number[.subinterface-number ]
```
  Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731S-H, S5731-S, S5731S-S, S6720-HI, S5732-H, S6730-H, S6730S-H, S6730-S, S6730S-S, S6720-EI, and S6720S-EI support sub-interfaces.
3. (Optional) On an Ethernet interface, run undo portswitch
  The interface is switched to Layer 3 mode.
  
  By default, an Ethernet interface works in Layer 2 mode.
  
  Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support switching between Layer 2 and Layer 3 modes.
4. Specify the range of IP addresses that the DHCP server can allocate.
```
dhcp server ip-range start-ip-address end-ip-address
```
5. Specify the subnet mask for the range of IP addresses.
```
dhcp server mask { mask | mask-length }
```
Global address pool:
1. Enter the system view.
```
system-view
```
2. Enter the global address pool view.
```
ip pool ip-pool-name
```
3. Specify the IP address segment of the global address pool.
```
section section-id start-address [ end-address ]
```
  An IP address pool can contain one or more IP address segments that cannot overlap with each other.
  Note the following points when specifying IP address segment of the global address pool:
  - If you run the network (IP address pool view) first, ensure that the address segment specified in the section (IP address pool view) command is included in the address range specified in the network (IP address pool view) command.
  - If you run the section (IP address pool view) first, ensure that the address segment specified in the network (IP address pool view) command includes the address range specified in the section (IP address pool view) command.