3com 5500-SI Manual De Usuario

C

HAPTER

 17: N

ETWORK

 P

ROTOCOL

 O

PERATION

1 Create a DHCP server group that will use two DHCP servers (a master and an optional 

backup) and assign it the IP addresses of the two DHCP servers (the first IP address is 
the master).

[SW5500]dhcp-server 0 ip 192.168.1.1 192.168.2.1

2 Configure the Switch so all clients use DHCP server group '0'.

[SW5500]interface vlan-interface 1

[SW5500-Vlan-interface1]dhcp-server 0

[SW5500-Vlan-interface1]quit

[SW5500]interface vlan-interface 10

[SW5500-Vlan-interface10]dhcp-server 0

[SW5500-Vlan-interface10]quit

The segment address for the DHCP Client is 10.110.0.0, which is connected to a port 
in VLAN2 on the Switch. The IP address of the DHCP Server is 202.38.1.2. The DHCP 
packets should be forwarded using the Switch with DHCP Relay enabled. A DHCP 
Client can get its IP address and other configuration information from the DHCP 
Server.

Figure 75   Networking Diagram of Configuration DHCP Relay

1 Configure the group number of DHCP Server as 1 and the IP address as 202.38.1.2. 

[SW5500]dhcp-server 1 ip 202.38.1.2

2 Associate the VLAN interface 2 with DHCP Server group 1. 

[SW5500]interface vlan 2

[SW5500-Vlan-interface2]dhcp-server 1

3 Configure the IP address of the VLAN interface 2, which must be in the same segment 

as DCHP Client.

[SW5500-Vlan-interface2]ip address 10.110.1.1 255.255.0.0

To allocate an IP address successfully for the DHCP Client, you need to make the 
necessary configuration on the DHCP Server, which varies, depending on device type.

Ethernet

Ethernet

Internet

DHCP client

DHCP client

Switch ( DHCP Relay )

10.110.0.0

DHCP Server

202.38.1.2

10.110.1.1

202.38.0.0

202.38.1.1