3Com WX3000 operation manual Displaying and Maintaining Dhcp Relay Agent Configuration

To do…	Use the command…	Remarks
Enter system view	system-view	—
Enable Option 82 support on the	dhcp relay information	Required
DHCP relay agent	enable	Disabled by default.
Configure the strategy for the DHCP	dhcp relay information	Optional
relay agent to process request	strategy { drop keep	By default, the replace
packets containing Option 82	replace }	strategy is adopted

zBy 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.

zTo 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	display dhcp-server groupNo
DHCP server group
Display the information about the DHCP	display dhcp-server interface	Available in any
server group to which a specified VLAN
	vlan-interface vlan-id	view
interface is mapped
Display the specified client address	display dhcp-security [ ip-address
entries on the DHCP relay agent	dynamic static tracker ]
Clear the statistics information of the	reset dhcp-server groupNo	Available in user
specified DHCP server group		view

DHCP Relay Agent Configuration Example

Network requirements

As shown in Figure 2-4, 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.

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