Chapter 1 Dhcp Overview; Introduction To Dhcp; Dhcp Address Allocation; Allocation Mechanisms - H3C S9500 Series Operation Manual

Operation Manual – DHCP
H3C S9500 Series Routing Switches
When configuring DHCP, go to these sections for information you are interested in:

Introduction to DHCP

DHCP Address Allocation

DHCP Message Format
Protocols and Standards
1.1 Introduction to DHCP
The fast expansion and growing complexity of networks result in scarce IP addresses
assignable to hosts. Meanwhile, many people need to take their laptops across
networks, and the IP addresses need be changed accordingly. Therefore, the related
configurations on hosts become more complex. Dynamic host configuration protocol
(DHCP) was introduced to provide a framework for passing configuration information to
hosts on a TCP/IP network.
DHCP is built on a client-server model, in which the 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
multiple clients (PCs and laptops).
DHCP client
DHCP client
Figure 1-1 A typical DHCP application
1.2 DHCP Address Allocation

1.2.1 Allocation Mechanisms

Different DHCP clients need to occupy their IP addresses for different time durations.
For example, some servers need fixed IP addresses, some hosts need to use dynamic

Chapter 1 DHCP Overview

DHCP client
DHCP client
Figure 1-1, includes a DHCP server and
DHCP server
1-1
Chapter 1 DHCP Overview