3com 5500G ユーザーズマニュアル

C

HAPTER

 21: DHCP C

ONFIGURATION

 G

UIDE

Figure 55   Network diagram for DHCP relay agent configuration

 

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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 the IP address of VLAN-interface 2 is 10.1.1.2/24.

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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.

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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.

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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.

# 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.

Switch B

Switch A

IP:10.10.10.5/24

MAC:0001 -0010- 0001

Vlan- int2
10.1.1.2 /24

Vlan-int1

10.10.1.1 /24

Vlan- int2

10.1.1.1 /24

Switch 5500

Release V03.02.04 

All versions 

Switch 5500G

Release V03.02.04 

All versions 

Switch 4500

Release V03.03.00 

All versions