H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 312)

31-8
Configuring the DHCP relay agent to support Option 82
Follow these steps to configure the DHCP relay agent to support Option 82:
To do… Use the command… Remarks
Enter system view system-view —
Enable Option 82 support on the DHCP
relay agent
dhcp relay information enable
Required
Disabled by default.
Configure the strategy for the DHCP
relay agent to process request packets
containing Option 82
dhcp relay information strategy
{ drop | keep | replace }
Optional
By default, the replace
strategy is adopted
z
By default, with the Option 82 support function enabled on the DHCP relay agent, the DHCP relay
agent will adopt the replace strategy to process the request packets containing Option 82.
However, if other strategies are configured before, then enabling the 82 support on the DHCP relay
agent will not change the configured strategies.
z
To enable Option 82, you need to perform the corresponding configuration on the DHCP server
and the DHCP relay agent.
Displaying and Maintaining DHCP Relay Agent Configuration
To do… Use the command… Remarks
Display the information about a specified
DHCP server group
display dhcp-server groupNo
Display the information about the DHCP
server group to which a specified VLAN
interface is mapped
display dhcp-server interface
vlan-interface vlan-id
Display the specified client address entries on
the DHCP relay agent display dhcp-security [ ip-address |
dynamic | static | tracker ]
Available in any
view
Clear the statistics information of the specified
DHCP server group
reset dhcp-server groupNo
Available in user
view
DHCP Relay Agent Configuration Example
Network requirements
As shown in Figure 33-4 , 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 to assign IP
addresses in subnet 10.10.1.0/24 to the clients.