Dynamic IP address assignment configuration example
Network requirements
As shown in Figure 30, the DHCP server (Switch A) assigns IP addresses to clients in subnet 10.1.1.0/24, which is subnetted into 10.1.1.0/25 and 10.1.1.128/25.
The IP addresses of VLAN-interfaces 1 and 2 on Switch A are 10.1.1.1/25 and 10.1.1.129/25 respectively.
In address pool 10.1.1.0/25, configure the address lease duration as ten days and twelve hours, domain name suffix aabbcc.com, DNS server address 10.1.1.2/25, gateway 10.1.1.126/25, and WINS server 10.1.1.4/25.
In address pool 10.1.1.128/25, configure the address lease duration as five days, domain name suffix aabbcc.com, DNS server address 10.1.1.2/25, and gateway address 10.1.1.254/25, and there is no WINS server address.
The domain name and DNS server address on subnets 10.1.1.0/25 and 10.1.1.128/25 are the same. Therefore, the domain name suffix and DNS server address can be configured only for subnet 10.1.1.0/24. Subnet 10.1.1.128/25 can inherit the configuration of subnet 10.1.1.0/24.
Figure 30: Network diagram
Configuration procedure
Specify IP addresses for VLAN interfaces. (Details not shown.)
Configure the DHCP server:
# Enable DHCP.
<SwitchA> system-view [SwitchA] dhcp enable
# Enable the DHCP server on VLAN-interface 1 and VLAN-interface 2.
[SwitchA] interface vlan-interface 1 [SwitchA-Vlan-interface1] dhcp select server global-pool [SwitchA-Vlan-interface1] quit [SwitchA] interface vlan-interface 2 [SwitchA-Vlan-interface2] dhcp select server global-pool [SwitchA-Vlan-interface2] quit
# Exclude IP addresses (addresses of the DNS server, WINS server and gateways).
[SwitchA] dhcp server forbidden-ip 10.1.1.2 [SwitchA] dhcp server forbidden-ip 10.1.1.4 [SwitchA] dhcp server forbidden-ip 10.1.1.126 [SwitchA] dhcp server forbidden-ip 10.1.1.254
# Configure DHCP address pool 0 (subnet, client domain name suffix, and DNS server address).
[SwitchA] dhcp server ip-pool 0 [SwitchA-dhcp-pool-0] network 10.1.1.0 mask 255.255.255.0 [SwitchA-dhcp-pool-0] domain-name aabbcc.com [SwitchA-dhcp-pool-0] dns-list 10.1.1.2 [SwitchA-dhcp-pool-0] quit
# Configure DHCP address pool 1 (subnet, gateway, lease duration, and WINS server).
[SwitchA] dhcp server ip-pool 1 [SwitchA-dhcp-pool-1] network 10.1.1.0 mask 255.255.255.128 [SwitchA-dhcp-pool-1] gateway-list 10.1.1.126 [SwitchA-dhcp-pool-1] expired day 10 hour 12 [SwitchA-dhcp-pool-1] nbns-list 10.1.1.4 [SwitchA-dhcp-pool-1] quit
# Configure DHCP address pool 2 (subnet, gateway, and lease duration).
[SwitchA] dhcp server ip-pool 2 [SwitchA-dhcp-pool-2] network 10.1.1.128 mask 255.255.255.128 [SwitchA-dhcp-pool-2] expired day 5 [SwitchA-dhcp-pool-2] gateway-list 10.1.1.254
Verifying the configuration
After the preceding configuration is complete, clients on networks 10.1.1.0/25 and 10.1.1.128/25 can obtain IP addresses on the corresponding network and other network parameters from Switch A. You can use the display dhcp server ip-in-use command on the DHCP server to view the IP addresses assigned to the clients.