3com 5500-ei pwr Installation Instruction

 

3-9 

Figure 3-4 Network diagram for DHCP relay agent 

Switch B

Switch A

Vlan-int2
10.1.1.2/24

Vlan-int1

10.10.1.1/24

Vlan-int2

10.1.1.1/24

 

 

# Create DHCP server group 1 and configure an IP address of 10.1.1.1 for it. 

<SwitchA> system-view 

[SwitchA] dhcp-server 1 ip 10.1.1.1 

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

[SwitchA] interface Vlan-interface 1 

[SwitchA-Vlan-interface1] dhcp-server 1 

 

z 

You need to perform corresponding configurations on the DHCP server to enable the DHCP clients 

to obtain IP addresses from the DHCP server. The DHCP server configurations vary with different 

DHCP server devices, so the configurations are omitted. 

z 

The DHCP relay agent and DHCP server must be reachable to each other. 

 

A client fails to obtain configuration information through a DHCP relay agent. 

This problem may be caused by improper DHCP relay agent configuration. When a DHCP relay agent 

operates improperly, you can locate the problem by enabling debugging and checking the information 

about debugging and interface state (You can display the information by executing the corresponding 

display command.) 

z 

Check if DHCP is enabled on the DHCP server and the DHCP relay agent.