H3C Technologies H3C S3600 Series Switches - Manual (Page 636)

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DHCP Overview
When configuring DHCP, go to these sections for information you are interested in:
z Introduction to DHCP
z DHCP IP Address Assignment
z DHCP Packet Format
z Protocol Specification
z The qos-profile keyword and IP filtering based on authenticated 802.1x clients are added. For
details, refer to Configuring IP Filtering .
z The function of removing DHCP snooping entries is added in this manual. For details, refer to
Displaying and Maintaining DHCP Snooping Configuration .
z The function of DHCP Inform Message Handling Feature Used in IRF System is added in this
manual. For details, refer to Configuring DHCP Inform Message Handling Feature Used in IRF
System.
Introduction to DHCP
With networks getting larger in size and more complicated in structure, lack of available IP addresses
becomes the common situation the network administrators have to face, and network configuration
becomes a tough task for the network administrators. With the emerging of wireless networks and the
using of laptops, the position change of hosts and frequent change of IP addresses also require new
technology. Dynamic Host Configuration Protocol (DHCP) is developed to solve these issues.
DHCP adopts a client/server model, where the DHCP clients send requests to DHCP servers for
configuration parameters; and the DHCP servers return the corresponding configuration information
such as IP addresses to implement dynamic allocation of network resources.
A typical DHCP application includes one DHCP server and multiple clients (such as PCs and laptops),
as shown in Figure 1-1 .