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IPC-63

Cisco IOS IP Configuration Guide

Configuring DHCP

This chapter describes how to configure Dynamic Host Configuration Protocol (DHCP). For a complete

description of the DHCP commands listed in this chapter, refer to the “DHCP Commands” chapter of

the Cisco IOS IP Command Reference, Volume 1 of 3: Addressing and Services publication. To locate

documentation of other commands that appear in this chapter, use the command reference master index,

or search online.

As explained in RFC 2131, Dynamic Host Configuration Protocol, DHCP provides configuration

parameters to Internet hosts. DHCP consists of two components: a protocol for delivering host-specific

configuration parameters from a DHCP Server to a host and a mechanism for allocating network

addresses to hosts. DHCP is built on a client/server model, where designated DHCP Server hosts allocate

network addresses and deliver configuration parameters to dynamically configured hosts.

DHCP supports three mechanisms for IP address allocation:

• Automatic allocation—DHCP assigns a permanent IP address to a client.

• Dynamic allocation—DHCP assigns an IP address to a client for a limited period of time (or until

the client explicitly relinquishes the address).

• Manual allocation—The network administrator assigns an IP address to a client and DHCP is used

simply to convey the assigned address to the client.

The format of DHCP messages is based on the format of Bootstrap Protocol (BOOTP) messages, which

ensures support for BOOTP relay agent functionality and interoperability between BOOTP clients and

DHCP Servers. BOOTP relay agents eliminate the need for deploying a DHCP Server on each physical

network segment. BOOTP is explained in RFC 951, Bootstrap Protocol (BOOTP), and RFC 1542,

Clarifications and Extensions for the Bootstrap Protocol.

To identify the hardware platform or software image information associated with a feature, use the

Feature Navigator on Cisco.com to search for information about the feature or refer to the software

release notes for a specific release. For more information, see the “Identifying Supported Platforms”

section in the “Using Cisco IOS Software” chapter in this book.

DHCP Server Overview

The Cisco IOS DHCP Server feature is a full DHCP Server implementation that assigns and manages IP

addresses from specified address pools within the router to DHCP clients. If the Cisco IOS DHCP Server

cannot satisfy a DHCP request from its own database, it can forward the request to one or more

secondary DHCP Servers defined by the network administrator.

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Inhaltsverzeichnis

Seite 1 - Configuring DHCP

IPC-63Cisco IOS IP Configuration GuideConfiguring DHCPThis chapter describes how to configure Dynamic Host Configuration Protocol (DHCP). For a comple

Seite 2 - DHCP Server Overview

Configuring DHCPDHCP Configuration Task ListIPC-72Cisco IOS IP Configuration GuideConfiguring DHCP Server Options Import and AutoconfigurationThe Cisc

Seite 3 - DHCP Relay Agent Overview

Configuring DHCPMonitoring and Maintaining the DHCP ServerIPC-73Cisco IOS IP Configuration GuideConfiguring the Relay Agent Information Option in BOOT

Seite 4 - DHCP Configuration Task List

Configuring DHCPConfiguration ExamplesIPC-74Cisco IOS IP Configuration GuideTo enable DHCP Server debugging, use the following command in privileged E

Seite 5 - Excluding IP Addresses

Configuring DHCPConfiguration ExamplesIPC-75Cisco IOS IP Configuration GuideDHCP Address Pool Configuration ExampleIn the following example, three DHC

Seite 6

Configuring DHCPConfiguration ExamplesIPC-76Cisco IOS IP Configuration GuideBecause attributes are inherited, the previous configuration is equivalent

Seite 7 - Configuring Manual Bindings

Configuring DHCPConfiguration ExamplesIPC-77Cisco IOS IP Configuration GuideFigure 17 DHCP Example Network TopologyCentral Router!do not assign this r

Seite 8

Configuring DHCPConfiguration ExamplesIPC-78Cisco IOS IP Configuration Guide

Seite 9

Configuring DHCPDHCP Server OverviewIPC-64Cisco IOS IP Configuration GuideFigure 15 shows the basic steps that occur when a DHCP client requests an IP

Seite 10

Configuring DHCPDHCP Client OverviewIPC-65Cisco IOS IP Configuration GuideBefore you configure the Cisco IOS DHCP Server feature, complete the followi

Seite 11

Configuring DHCPDHCP Configuration Task ListIPC-66Cisco IOS IP Configuration GuideDHCP Configuration Task ListThe DHCP Server database is organized as

Seite 12 - Configuration Examples

Configuring DHCPDHCP Configuration Task ListIPC-67Cisco IOS IP Configuration GuideIf you choose not to configure a DHCP database agent, disable the re

Seite 13

Configuring DHCPDHCP Configuration Task ListIPC-68Cisco IOS IP Configuration GuideConfiguring the DHCP Address Pool Subnet and MaskTo configure a subn

Seite 14 - Cisco IOS DHCP Client Example

Configuring DHCPDHCP Configuration Task ListIPC-69Cisco IOS IP Configuration GuideConfiguring the NetBIOS Node Type for the ClientThe NetBIOS node typ

Seite 15 - Remote Router

Configuring DHCPDHCP Configuration Task ListIPC-70Cisco IOS IP Configuration GuideAutomatic bindings are IP addresses that have been automatically map

Seite 16

Configuring DHCPDHCP Configuration Task ListIPC-71Cisco IOS IP Configuration GuideConfiguring the Number of Ping PacketsBy default, the DHCP Server pi