H3C S5120-SI Series Configuration Manual page 41

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relay agent is deployed to forward messages between DHCP clients and the DHCP server. VLAN-

interface 1 on the DHCP relay agent (Switch A) connects to the network where DHCP clients reside. The IP

address of VLAN-interface 1 is 10.10.1.1/24 and the IP address of VLAN-interface 2 is 10.1.1.2/24.

Figure 1 1

Network diagram for DHCP relay agent

Configuration procedure

Specify IP addresses for the interfaces (detailed steps not shown).

Enable DHCP.

<SwitchA> system-view

[SwitchA] dhcp enable

Add DHCP server 10.1.1.1 into DHCP server group 1.

[SwitchA] dhcp relay server-group 1 ip 10.1.1.1

Enable the DHCP relay agent on VLAN-interface 1.

[SwitchA] interface vlan-interface 1

[SwitchA-Vlan-interface1] dhcp select relay

Correlate VLAN-interface 1 to DHCP server group 1.

[SwitchA-Vlan-interface1] dhcp relay server-select 1

After the preceding configuration is complete, DHCP clients can obtain IP addresses and other network

parameters through the DHCP relay agent from the DHCP server. You can use the display dhcp relay

security command to view bindings of DHCP relay agents, and use the display dhcp relay

statistics command to view statistics of DHCP packets forwarded by DHCP relay agents.

Because the DHCP relay agent and server are on different subnets, you need to configure a static route or dynamic

routing protocol to make them reachable to each other.

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