Dhcp Overview; Introduction To Dhcp; Dhcp Address Allocation; Allocation Mechanisms - 3Com Baseline 2928 PWR Plus User Manual

1

DHCP Overview

After the DHCP client is enabled on an interface, the interface can dynamically obtain an IP address
and other configuration parameters from the DHCP server. This facilitates configuration and centralized
management. For details about the DHCP client configuration, refer to VLAN Interface Configuration.

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
and laptops).
Figure 1-1 A typical DHCP application
A DHCP client can get an IP address and other configuration parameters from a DHCP server on
another subnet via a DHCP relay agent. For details about the DHCP relay agent configuration, refer to
DHCP Relay Agent

DHCP Address Allocation

Allocation Mechanisms

DHCP supports three mechanisms for IP address allocation.
Figure
Configuration.
1-1, includes a DHCP server and multiple clients (PCs
1-1