Example for Configuring a DHCP Server (Based on an Interface Address Pool)

Networking Requirements

In Figure 1, an enterprise plans two network segments for office terminals: 10.1.1.0/24 for fixed terminals and 10.1.2.0/24 for terminals used by staff on business trips. To facilitate unified management, the enterprise requires terminals to automatically obtain IP addresses and the DNS server IP address from the Switch (if users access the Internet using domain names, a DNS server must be specified). A PC (DHCP Client_1) requires fixed IP address 10.1.1.100/24 to meet service requirements.

Figure 1 Networking diagram for configuring a device as a DHCP server

Configuration Roadmap

The configuration roadmap is as follows:

Configure the switch as a DHCP server to dynamically allocate IP addresses on the two network segments and the DNS server IP address to enterprise terminals.
Allocate IP addresses on 10.1.1.0/24 to fixed terminals and set the lease time of these IP addresses to 30 days.
Statically allocate the fixed IP address 10.1.1.100/24 to DHCP Client_1.
Allocate IP addresses on 10.1.2.0/24 to terminals used by staff on business trips and set the lease time of these IP addresses to two days.

Procedure

Enable DHCP.

<HUAWEI> system-view
[HUAWEI] sysname Switch
[Switch] dhcp enable

Add interfaces to VLANs.

# Add GE0/0/1 to VLAN 10.

[Switch] vlan batch 10 to 11
[Switch] interface gigabitethernet 0/0/1
[Switch-GigabitEthernet0/0/1] port link-type hybrid
[Switch-GigabitEthernet0/0/1] port hybrid pvid vlan 10
[Switch-GigabitEthernet0/0/1] port hybrid untagged vlan 10
[Switch-GigabitEthernet0/0/1] quit

# Add GE0/0/2 to VLAN 11.

[Switch] interface gigabitethernet 0/0/2
[Switch-GigabitEthernet0/0/2] port link-type hybrid
[Switch-GigabitEthernet0/0/2] port hybrid pvid vlan 11
[Switch-GigabitEthernet0/0/2] port hybrid untagged vlan 11
[Switch-GigabitEthernet0/0/2] quit

Configure IP addresses for VLANIF interfaces.

# Configure an IP address for VLANIF 10.

[Switch] interface vlanif 10
[Switch-Vlanif10] ip address 10.1.1.1 24
[Switch-Vlanif10] quit

# Configure an IP address for VLANIF 11.

[Switch] interface vlanif 11
[Switch-Vlanif11] ip address 10.1.2.1 24
[Switch-Vlanif11] quit

Configure interface address pools.

# Configure the clients connected to VLANIF 10 to obtain IP addresses and other network parameters from the address pool on VLANIF 10.

[Switch] interface vlanif 10
[Switch-Vlanif10] dhcp select interface
[Switch-Vlanif10] dhcp server gateway-list 10.1.1.1
[Switch-Vlanif10] dhcp server lease day 30
[Switch-Vlanif10] dhcp server domain-name huawei.com
[Switch-Vlanif10] dhcp server dns-list 10.1.3.1
[Switch-Vlanif10] dhcp server static-bind ip-address 10.1.1.100 mac-address 286e-d488-b684
[Switch-Vlanif10] quit

# Configure the clients connected to VLANIF 11 to obtain IP addresses and other network parameters from the address pool on VLANIF 11.

[Switch] interface vlanif 11
[Switch-Vlanif11] dhcp select interface
[Switch-Vlanif11] dhcp server gateway-list 10.1.2.1
[Switch-Vlanif11] dhcp server lease day 2
[Switch-Vlanif11] dhcp server domain-name huawei.com
[Switch-Vlanif11] dhcp server dns-list 10.1.3.1
[Switch-Vlanif11] quit

Enable the device to save DHCP data to the storage device. If a fault occurs on the device, you can run the dhcp server database recover command after the system restarts to restore DHCP data from files on the storage device.
```
[Switch] dhcp server database enable
```

Verify the configuration.

# On the switch, run the display ip pool command to view IP address allocation in address pools. The Used field displays the number of used IP addresses in the address pool. For example, the enterprise has 100 employees with fixed office terminals and 3 employees on business trips.

[Switch] display ip pool interface vlanif10
  Pool-name        : Vlanif10
  Pool-No          : 0
  Lease            : 30 Days 0 Hours 0 Minutes
  Domain-name      : huawei.com
  DNS-server0      : 10.1.3.1
  NBNS-server0     : -
  Netbios-type     : -
  Position         : Interface
  Status           : Unlocked
  Gateway-0        : 10.1.1.1
  Network          : 10.1.1.0
  Mask             : 255.255.255.0
  VPN instance     : --
  Logging          : Disable
  Conflicted address recycle interval: -
  Address Statistic: Total       :253       Used        :100
                     Idle        :153       Expired     :0
                     Conflict    :0         Disabled     :0

 -------------------------------------------------------------------------------
  Network section
         Start           End       Total    Used Idle(Expired) Conflict Disabled
 -------------------------------------------------------------------------------
        10.1.1.1      10.1.1.254     253     100        153(0)       0     0
 -------------------------------------------------------------------------------

[Switch] display ip pool interface vlanif11
  Pool-name        : Vlanif11
  Pool-No          : 1
  Lease            : 2 Days 0 Hours 0 Minutes
  Domain-name      : huawei.com
  DNS-server0      : 10.1.3.1
  NBNS-server0     : -
  Netbios-type     : -
  Position         : Interface
  Status           : Unlocked
  Gateway-0        : 10.1.2.1
  Network          : 10.1.2.0
  Mask             : 255.255.255.0
  VPN instance     : --
  Logging          : Disable
  Conflicted address recycle interval: -
  Address Statistic: Total       :253       Used        :3
                     Idle        :250       Expired     :0
                     Conflict    :0         Disabled     :0

 -------------------------------------------------------------------------------
  Network section
         Start           End       Total    Used Idle(Expired) Conflict Disabled
 -------------------------------------------------------------------------------
        10.1.1.1      10.1.1.254    253       3        250(0)       0     0
 -------------------------------------------------------------------------------

Check IP address information on Client_1 (using Windows 7 operating system). The IP address 10.1.1.100/24 has been assigned to Client_1.

C:\Documents and Settings\Administrator>ipconfig

Windows IP Configuration


Ethernet adapter Local Area Connection 2:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 10.1.1.100
   Subnet Mask . . . . . . . . . . . : 255.255.254.0
   Default Gateway . . . . . . . . . : 10.1.1.1

Check IP address information another DHCP client (for example, a terminal belonging to the network segment 10.1.1.0/24 and using Windows 7 operating system). An IP address has been assigned.

C:\Documents and Settings\Administrator>ipconfig

Windows IP Configuration


Ethernet adapter Local Area Connection 2:

   Connection-specific DNS Suffix  . :
   IPv4 Address. . . . . . . . . . . : 10.1.1.51
   Subnet Mask . . . . . . . . . . . : 255.255.254.0
   Default Gateway . . . . . . . . . : 10.1.1.1

Configuration Files

Switch configuration file

#
sysname Switch
#
vlan batch 10 to 11
#
dhcp enable
#
dhcp server database enable
#
interface Vlanif10
 ip address 10.1.1.1 255.255.255.0
 dhcp select interface
 dhcp server gateway-list 10.1.1.1
 dhcp server static-bind ip-address 10.1.1.100 mac-address 286e-d488-b684
 dhcp server lease day 30 hour 0 minute 0
 dhcp server dns-list 10.1.3.1
 dhcp server domain-name huawei.com
#
interface Vlanif11
 ip address 10.1.2.1 255.255.255.0
 dhcp select interface
 dhcp server gateway-list 10.1.2.1
 dhcp server lease day 2 hour 0 minute 0
 dhcp server dns-list 10.1.3.1
 dhcp server domain-name huawei.com
#
interface GigabitEthernet0/0/1
 port link-type hybrid
 port hybrid pvid vlan 10
 port hybrid untagged vlan 10
#
interface GigabitEthernet0/0/2
 port link-type hybrid
 port hybrid pvid vlan 11
 port hybrid untagged vlan 11
#
return