Cisco CNS Network Registrar User's Guide, 6.0
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Table Of Contents


Who Should Read This Guide

How This Guide Is Organized

Document Conventions

Obtaining Documentation

Documentation CD-ROM

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Technical Assistance Center

Cisco TAC Website

Cisco TAC Escalation Center

Obtaining Additional Publications and Information


This section describes the reader, organization, and conventions contained in this guide.

Who Should Read This Guide

This guide is designed for network managers who are responsible for maintaining the network DNS, DHCP, and TFTP servers. The network manager should be familiar with the following topics:

Basic concepts and terminology used in internetworking

Network topology and protocols

Note This guide describes configuring Cisco CNS Network Registrar using the command line interface (CLI) and Windows graphical user interface (GUI). The new Web-based user interface (Web UI) is covered in a separate Network Registrar Web UI Guide.

How This Guide Is Organized

This guide describes how to become familiar with Network Registrar features so that you can use them to administer network addresses. The major sections of this guide are as follows:

Chapter 1

Introducing Network Registrar

Describes the Network Registrar features, and provides configuration guidelines and a documentation road map

Chapter 2

Understanding Network Registrar Concepts

Provides an overview of Internet Protocol (IP) concepts and their implementation

Chapter 3

Network Registrar User Interfaces

Describes the basic capabilities of the Network Registrar command line (CLI) and graphical user (GUI) interfaces

Chapter 4

Administering Network Registrar

Explains how to administer and control Network Registrar servers

Chapter 5

Configuring DNS Servers

Explains how to configure a Domain Name System (DNS) server using Network Registrar

Chapter 6

Customizing DNS Zone and Server Parameters

Explains how to configure DNS zones and zone properties

Chapter 7

Configuring DHCP Servers

Explains how to configure a Dynamic Host Configuration Protocol (DHCP) server

Chapter 8

Configuring DHCP Scopes and Leases

Explains how to define and configure DHCP scopes and manage leases

Chapter 9

Configuring Dynamic DNS Update

Explains how to define and configure dynamic DNS update support for DHCP servers

Chapter 10

Configuring Clients and Client-Classes

Explains how to configure the client-class quality of service for groups of DHCP clients

Chapter 11

Configuring DHCP Failover

Explains how to configure redundant DHCP servers for failover purposes

Chapter 12

Configuring BOOTP

Explains how to configure a DHCP server as a Bootstrap Protocol (BOOTP) server

Chapter 13

Configuring LDAP

Describes how configure a Lightweight Directory Access Protocol (LDAP) directory server for Network Registrar

Chapter 14

Configuring the DHCP Server for Virtual Private Networks and Subnet Allocation

Describes how to configure virtual private networks (VPNs) and subnet allocation of on-demand address pools in DHCP

Chapter 15

Using Extension Points

Describes how to use extensions and extension points to affect DHCP request processing and server behavior

Appendix A

Resource Records

Defines the supported DNS resource records

Appendix B

DHCP Options

Defines the DHCP options used in policies and scopes

Appendix C

Restoring a Loopback Zone

Explains how to restore a deleted loopback zone

Appendix D

Windows 2000 Interoperability

Explains how Network Registrar interoperates with Windows 2000 clients and servers

Appendix E

SNMP Notification

Explains error notification through the Simple Network Management Protocol (SNMP)

Appendix F

DHCP Extension Dictionary

Lists the DHCP extension dictionary entries and application program interface (API) calls

Appendix G

Variations to the GUI

Lists the variations found in the GUI per release



Defines terms applicable to Network Registrar



Provides an index to this guide

Document Conventions

This guide uses the following documentation conventions:

Command paths in the GUI are indicated in the form Start > Programs > Network Registrar.

Windows systems use a two-button mouse. To drag and drop an object, click and hold the left mouse button on the object, drag the object to the target location, then release the button.

Solaris systems use a three-button mouse. To drag and drop an object, click and hold the middle mouse button on the object, drag the object to the target location, then release the button.

Screen displays can differ slightly from those included in this guide, depending on the system you use. For example, Microsoft Windows screens are different from X-Windows screens.

Caution Be careful. The description alerts you to potential data damage or loss in the context.

Note Take note. The description is particularly noteworthy in the context.

Timesaver Save time. The description can present a timesaver in the context.

Tip Consider this helpful hint. The description can present an optimum action to take in the context.

Obtaining Documentation

Cisco provides several ways to obtain documentation, technical assistance, and other technical resources. These sections explain how to obtain technical information from Cisco Systems.

You can access the most current Cisco documentation on the World Wide Web at this URL:

You can access the Cisco website at this URL:

International Cisco websites can be accessed from this URL:

Documentation CD-ROM

Cisco documentation and additional literature are available in a Cisco Documentation CD-ROM package, which may have shipped with your product. The Documentation CD-ROM is updated regularly and may be more current than printed documentation. The CD-ROM package is available as a single unit or through an annual or quarterly subscription.

Registered users can order a single Documentation CD-ROM (product number DOC-CONDOCCD=) through the Cisco Ordering tool:

All users can order monthly or quarterly subscriptions through the online Subscription Store:

Ordering Documentation

You can find instructions for ordering documentation at this URL:

You can order Cisco documentation in these ways:

Registered users (Cisco direct customers) can order Cisco product documentation from the Networking Products MarketPlace:

Nonregistered users can order documentation through a local account representative by calling Cisco Systems Corporate Headquarters (California, U.S.A.) at 408 526-7208 or, elsewhere in North America, by calling 800 553-NETS (6387).

Documentation Feedback

You can submit comments electronically on On the Cisco Documentation home page, click Feedback at the top of the page.

You can e-mail your comments to

You can submit comments by using the response card (if present) behind the front cover of your document or by writing to the following address:

Cisco Systems
Attn: Customer Document Ordering
170 West Tasman Drive
San Jose, CA 95134-9883

We appreciate your comments.

Obtaining Technical Assistance

Cisco provides, which includes the Cisco Technical Assistance Center (TAC) website, as a starting point for all technical assistance. Customers and partners can obtain online documentation, troubleshooting tips, and sample configurations from the Cisco TAC website. registered users have complete access to the technical support resources on the Cisco TAC website, including TAC tools and utilities. offers a suite of interactive, networked services that let you access Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world. provides a broad range of features and services to help you with these tasks:

Streamline business processes and improve productivity

Resolve technical issues with online support

Download and test software packages

Order Cisco learning materials and merchandise

Register for online skill assessment, training, and certification programs

To obtain customized information and service, you can self-register on at this URL:

Technical Assistance Center

The Cisco TAC is available to all customers who need technical assistance with a Cisco product, technology, or solution. Two types of support are available: the Cisco TAC website and the Cisco TAC Escalation Center. The type of support that you choose depends on the priority of the problem and the conditions stated in service contracts, when applicable.

We categorize Cisco TAC inquiries according to urgency:

Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities, product installation, or basic product configuration. There is little or no impact to your business operations.

Priority level 3 (P3)—Operational performance of the network is impaired, but most business operations remain functional. You and Cisco are willing to commit resources during normal business hours to restore service to satisfactory levels.

Priority level 2 (P2)—Operation of an existing network is severely degraded, or significant aspects of your business operations are negatively impacted by inadequate performance of Cisco products. You and Cisco will commit full-time resources during normal business hours to resolve the situation.

Priority level 1 (P1)—An existing network is "down," or there is a critical impact to your business operations. You and Cisco will commit all necessary resources around the clock to resolve the situation.

Cisco TAC Website

The Cisco TAC website provides online documents and tools to help troubleshoot and resolve technical issues with Cisco products and technologies. To access the Cisco TAC website, go to this URL:

All customers, partners, and resellers who have a valid Cisco service contract have complete access to the technical support resources on the Cisco TAC website. Some services on the Cisco TAC website require a login ID and password. If you have a valid service contract but do not have a login ID or password, go to this URL to register:

If you are a registered user, and you cannot resolve your technical issues by using the Cisco TAC website, you can open a case online at this URL:

If you have Internet access, we recommend that you open P3 and P4 cases online so that you can fully describe the situation and attach any necessary files.

Cisco TAC Escalation Center

The Cisco TAC Escalation Center addresses priority level 1 or priority level 2 issues. These classifications are assigned when severe network degradation significantly impacts business operations. When you contact the TAC Escalation Center with a P1 or P2 problem, a Cisco TAC engineer automatically opens a case.

To obtain a directory of toll-free Cisco TAC telephone numbers for your country, go to this URL:

Before calling, please check with your network operations center to determine the Cisco support services to which your company is entitled: for example, SMARTnet, SMARTnet Onsite, or Network Supported Accounts (NSA). When you call the center, please have available your service agreement number and your product serial number.

Obtaining Additional Publications and Information

Information about Cisco products, technologies, and network solutions is available from various online and printed sources.

The Cisco Product Catalog describes the networking products offered by Cisco Systems, as well as ordering and customer support services. Access the Cisco Product Catalog at this URL:

Cisco Press publishes a wide range of networking publications. Cisco suggests these titles for new and experienced users: Internetworking Terms and Acronyms Dictionary, Internetworking Technology Handbook, Internetworking Troubleshooting Guide, and the Internetworking Design Guide. For current Cisco Press titles and other information, go to Cisco Press online at this URL:

Packet magazine is the Cisco quarterly publication that provides the latest networking trends, technology breakthroughs, and Cisco products and solutions to help industry professionals get the most from their networking investment. Included are networking deployment and troubleshooting tips, configuration examples, customer case studies, tutorials and training, certification information, and links to numerous in-depth online resources. You can access Packet magazine at this URL:

iQ Magazine is the Cisco bimonthly publication that delivers the latest information about Internet business strategies for executives. You can access iQ Magazine at this URL:

Internet Protocol Journal is a quarterly journal published by Cisco Systems for engineering professionals involved in designing, developing, and operating public and private internets and intranets. You can access the Internet Protocol Journal at this URL:

Training—Cisco offers world-class networking training. Current offerings in network training are listed at this URL: