H3C Technologies H3C S12500 Series Switches - Manual (Page 60)

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[SwitchA-dhcp-pool-2] domain-name aabbcc.com
[SwitchA-dhcp-pool-2] dns-list 10.1.1.2
[SwitchA-dhcp-pool-2] gateway-list 10.1.1.254
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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 correct IP addresses 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.
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DHCP user class configuration example
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Network requirement
• The DHCP relay agent (Switch A) forwards the packets from DHCP clients to the DHCP server.
Enable switch A to support Option 82 so that switch A can add Option 82 in the DHCP requests
sent by the DHCP clients.
• The DHCP server (Switch B) assigns IP addresses and other configuration parameters to the DHCP
clients. If the DHCP requests the DHCP server receives contain Option 82, the server assigns IP
addresses in the range of 10.10.1.2 to 10.10.1.10 to the clients.
• For clients in subnet 10.10.1.0/24, the DNS server address is 10.10.1.20/24 and the gateway
address is 10.10.1.255/24.
Figure 18 Network diagram
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Configuration procedure
1. Specify IP addresses for interfaces on DHCP server and DHCP relay agent. (Details not shown.)
2. Configure DHCP services:
# Enable DHCP and configure the DHCP server to handle Option 82.
<SwitchB> system-view
[SwitchB] dhcp enable
[SwitchB] dhcp server relay information enable
# Enable DHCP server on VLAN-interface10.
[SwitchB] interface vlan-interface 10
[SwitchB-Vlan-interface10] dhcp select server
[SwitchB-Vlan-interface10] quit
# Create DHCP user class tt to match client requests with Option 82.
[SwitchB] dhcp class tt