820 CHAPTER 58: DHCP RELAY AGENT CONFIGURATION
DHCP Relay Agent
Configuration
Example
Network requirements
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
IP address of VLAN-interface 2 is 10.1.1.2/24 that communicates with the DHCP
server 10.1.1.1/24. As shown in the figure below, Switch A forwards messages
between DHCP clients and the DHCP server.
Network diagram
Figure 249 Network diagram for DHCP relay agent
Configuration procedure
# Enable DHCP.
<SwitchA> system-view
[SwitchA] dhcp enable
# Enable the DHCP relay agent on VLAN-interface 1.
[SwitchA] interface vlan-interface 1
[SwitchA-Vlan-interface1] dhcp select relay
[SwitchA-Vlan-interface1] quit
# Configure DHCP server group 1 with the DHCP server 10.1.1.1, and correlate
the DHCP server group 1 with VLAN-interface 1.
[SwitchA] dhcp relay server-group 1 ip 10.1.1.1
[SwitchA] interface vlan-interface 1
[SwitchA-Vlan-interface1] dhcp relay server-select 1
n
■ Performing the configuration on the DHCP server is also required to guarantee
the client-server communication via the relay agent. Refer to “DHCP Server
Configuration Examples” on page 809 for DHCP server configuration
information.
■ If the DHCP relay agent and server are on different subnets, routes in between
must be reachable.
Switch B
DHCP serve
Switch A
DHCP relay agent
DHCP client DHCP client
DHCP clientDHCP client
Vlan-int2
10.1.1.2/24
Vlan-int1
10.10.1.1/24
Vlan-int2
10.1.1.1/24
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