H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – DHCP
H3C S7500 Series Ethernet Switches Chapter 3
DHCP Relay Agent Configuration
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Chapter 3 DHCP Relay Agent Configuration
When configuring DHCP relay agents, go to these sections for information you are
interested in:
z Introduction to DHCP Relay Agent
z Configuring DHCP Relay Agent
z Displaying and Maintaining DHCP Relay Agent
z DHCP Relay Agent Configuration Example
z Troubleshooting DHCP Relay Agent
3.1 Introduction to DHCP Relay Agent
3.1.1 Usage of DHCP Relay Agent
Since the packets are broadcasted in the process of obtaining IP addresses, DHCP is
only applicable to the situation that DHCP clients and DHCP servers are in the same
network segment, that is, you need to deploy at least one DHCP server for each
network segment, which is far from economical.
The DHCP relay agent is designed to address this problem. It enables DHCP clients
in a subnet to communicate with the DHCP server in another subnet so that the DHCP
clients can obtain IP addresses. In this case, the DHCP clients in multiple networks
can use the same DHCP server, which can decrease your cost and provide a
centralized administration.
3.1.2 DHCP Relay Agent Fundamentals
Figure 3-1 illustrates a typical DHCP relay agent application.
DHCP server
t
DHCP relay agen
DHCP client DHCP client
DHCP clientDHCP client
IP networkIP network
DHCP server
t
DHCP relay agen
DHCP client DHCP client
DHCP clientDHCP client
IP networkIP network
n Figure 3-1 Typical DHCP relay agent applicatio