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2-10

Configuration procedure

# Specify IP addresses for the interfaces (omitted).

# 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

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.

DHCP Relay Agent Option 82 Support Configuration Example

Network requirements

z As shown in Figure 2-3, Enable Option 82 on the DHCP relay agent (Switch A).

z Configure the handling strategy for DHCP requests containing Option 82 as replace.

z Configure the padding content for the circuit ID sub-option as company001 and for the remote ID

sub-option as device001.

z Switch A forwards DHCP requests to the DHCP server after replacing Option 82 in the requests, so

that the DHCP clients can obtain IP addresses.