3Com 5500G, 4210, 4200G manual Requirements, # Map VLAN-interface 1 to Dhcp server group

200CHAPTER 21: DHCP CONFIGURATION GUIDE

Network Diagram Figure 55 Network diagram for DHCP relay agent configuration

DHCP client DHCP client

				Vlan-int1	Vlan-int2
			10.10.1.1/24		10.1.1.2/24
						Vlan-int2
				Switch A		10.1.1.1/24	Switch B
				DHCP relay		DHCP server
	Host A	DHCP client
	IP:10.10.10.5/24
	MAC:0001-0010-0001
Networking and	■ VLAN-interface 1 on the DHCP relay agent (Switch A) connects to the network
Configuration	where DHCP clients reside. The IP address of VLAN-interface 1 is 10.10.1.1/24
Requirements	and the IP address of VLAN-interface 2 is 10.1.1.2/24.

■The clients (except Host A, which uses a fixed IP address of 10.10.10.5/24) dynamically obtain IP addresses from the DHCP server at 10.1.1.1/24.

■Switch A forwards messages between DHCP clients and the DHCP server to assign IP addresses in subnet 10.10.1.0/24 and related configuration information to the clients.

■Enable the address check function on Switch A to allow only the clients with valid fixed IP addresses or with IP addresses obtained from the DHCP server to access external networks.

Applicable Products

Product series	Software version	Hardware version
Switch 5500	Release V03.02.04	All versions
Switch 5500G	Release V03.02.04	All versions
Switch 4500	Release V03.03.00	All versions

Configuration Procedure # Create DHCP server group 1 and specify DHCP server 10.1.1.1 for it.

[SwitchA] dhcp-server 1 ip 10.1.1.1

# Configure the IP address of VLAN-interface 1 as 10.10.1.1/24.

[SwitchA] interface Vlan-interface 1

[SwitchA-Vlan-interface1] ip address 10.10.1.1 24

# Map VLAN-interface 1 to DHCP server group 1.

[SwitchA-Vlan-interface1] dhcp-server 1

[SwitchA-Vlan-interface1] quit

#Bind the IP address 10.10.10.5/24 to the MAC address 0001-0010-0001 of Host A on the DHCP relay agent.