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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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DHCP Overview

DHCP Overview

This section describes the definition and purpose of DHCP.


The Dynamic Host Configuration Protocol (DHCP) dynamically assigns IP addresses to users and manages user configurations in a centralized manner.


As the network expands and becomes complex, the number of hosts often exceeds the number of available IP addresses. As portable computers and wireless networks are widely used, the positions of computers often change, causing IP addresses of the computers to be changed accordingly. As a result, network configurations become increasingly complex. To properly and dynamically assign IP addresses to hosts, DHCP is used.

DHCP is developed based on the BOOTstrap Protocol (BOOTP). BOOTP runs on networks where each host has a fixed network connection. The administrator configures a BOOTP parameter file for each host, and the file remains unchanged for a long period of time. DHCP has the following new features compared with BOOTP:

  • Dynamically assigns IP addresses and configuration parameters to clients.
  • Enables a host to obtain an IP address dynamically, but does not specify an IP address for each host.

DHCP rapidly and dynamically allocates IP addresses, which improves IP address usage.


The device supports DHCP snooping. For details about DHCP snooping, see the CX11x&CX31x&CX91x Series Switch Modules Configuration Guide - Security.

Updated: 2019-08-09

Document ID: EDOC1000041694

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