H3C S5120-EI Series, Operation Manual

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1-1
This document is organized as follows:
z
DHCP Overview
z
DHCP Relay Agent Configuration
z
DHCP Client Configuration
z
DHCP Snooping Configuration
z
BOOTP Client Configuration
1
DHCP Overview
Support for enabling the DHCP relay agent to periodically refresh dynamic client entries is newly added
in Release 2202P19 of S5120-EI series Ethernet switches. For details, refer to
Configuring dynamic
binding update interval .
Introduction to DHCP
The fast expansion and growing complexity of networks result in scarce IP addresses assignable to
hosts. Meanwhile, as many people need to take their laptops across networks, the IP addresses need
to be changed accordingly. Therefore, related configurations on hosts become more complex. The
Dynamic Host Configuration Protocol (DHCP) was introduced to solve these problems.
DHCP is built on a client-server model, in which a client sends a configuration request and then the
server returns a reply to send configuration parameters such as an IP address to the client.
A typical DHCP application, as shown in
Figure 1-1 , includes a DHCP server and multiple clients (PCs
and laptops).
Figure 1-1
A typical DHCP application