Cisco CNS Network Registrar User's Guide, 5.5
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Table Of Contents


Who Should Read This Guide

How This Guide Is Organized

Document Conventions

Obtaining Documentation

World Wide Web

Documentation CD-ROM

Ordering Documentation

Documentation Feedback

Obtaining Technical Assistance

Technical Assistance Center

Cisco TAC Web Site

Cisco TAC Escalation Center


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

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 Cisco 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

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)



Defines terms applicable to Network Registrar



Provides an index to the 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 Helpful hint. The description can present an optimum action to take within the context.

Obtaining Documentation

The following sections explain how to obtain documentation from Cisco Systems.

World Wide Web

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

Translated documentation is available at the following URL:

Documentation CD-ROM

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

Ordering Documentation

Cisco documentation is available in the following ways:

Registered Cisco Direct Customers can order Cisco product documentation from the Networking Products MarketPlace:

Registered users can order the Documentation CD-ROM through the online Subscription Store:

Nonregistered users can order documentation through a local account representative by calling Cisco corporate headquarters (California, USA) at 408 526-7208 or, elsewhere in North America, by calling 800 553-NETS (6387).

Documentation Feedback

If you are reading Cisco product documentation on, you can submit technical comments electronically. Click Leave Feedback at the bottom of the Cisco Documentation home page. After you complete the form, print it out and fax it to Cisco at 408 527-0730.

You can e-mail your comments to

To submit your comments by mail, use the response card behind the front cover of your document, or write to the following address:

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

We appreciate your comments.

Obtaining Technical Assistance

Cisco provides as a starting point for all technical assistance. Customers and partners can obtain documentation, troubleshooting tips, and sample configurations from online tools by using the Cisco Technical Assistance Center (TAC) Web Site. registered users have complete access to the technical support resources on the Cisco TAC Web Site. is the foundation of a suite of interactive, networked services that provides immediate, open access to Cisco information, networking solutions, services, programs, and resources at any time, from anywhere in the world. is a highly integrated Internet application and a powerful, easy-to-use tool that provides a broad range of features and services to help you to

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

You can self-register on to obtain customized information and service. To access, go to the following 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 through the Cisco TAC: the Cisco TAC Web Site and the Cisco TAC Escalation Center.

Inquiries to Cisco TAC are categorized according to the urgency of the issue:

Priority level 4 (P4)—You need information or assistance concerning Cisco product capabilities, product installation, or basic product configuration.

Priority level 3 (P3)—Your network performance is degraded. Network functionality is noticeably impaired, but most business operations continue.

Priority level 2 (P2)—Your production network is severely degraded, affecting significant aspects of business operations. No workaround is available.

Priority level 1 (P1)—Your production network is down, and a critical impact to business operations will occur if service is not restored quickly. No workaround is available.

Which Cisco TAC resource you choose is based on the priority of the problem and the conditions of service contracts, when applicable.

Cisco TAC Web Site

The Cisco TAC Web Site allows you to resolve P3 and P4 issues yourself, saving both cost and time. The site provides around-the-clock access to online tools, knowledge bases, and software. To access the Cisco TAC Web Site, go to the following URL:

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

If you cannot resolve your technical issues by using the Cisco TAC Web Site, and you are a registered user, you can open a case online by using the TAC Case Open tool at the following URL:

If you have Internet access, it is recommended that you open P3 and P4 cases through the Cisco TAC Web Site.

Cisco TAC Escalation Center

The Cisco TAC Escalation Center addresses issues that are classified as priority level 1 or priority level 2; 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 will automatically open a case.

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

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