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Kevin Dooley - Cisco IOS Cookbook

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Never has something cried out for a cookbook quite as much as Ciscos Internetwork Operating System (IOS). IOS is powerful and flexible, but also confusing and daunting. Most tasks can be accomplished in several different ways. And you dont want to spend precious time figuring out which way is best when youre trying to solve a problem quickly. Thats what this cookbook is for. Fortunately, most router configuration tasks can be broken down into several more or less independent steps: you configure an interface, you configure a routing protocol, you set up backup links, you implement packet filters and other access control mechanisms. What you really need is a set of recipes that show you how to perform the most common tasks, so you can quickly come up with a good configuration for your site. And you need to know that these solutions work: you dont want to find yourself implementing a backup link at 2 A.M. because your main link is down and the backup link you set up when you installed the router wasnt quite right.Thoroughly revised and expanded, Cisco IOS Cookbook, 2nd Edition, adds sections on MPLS, Security, IPv6, and IP Mobility, and presents solutions to the most common configuration problems, including: * Configuring interfaces of many types, from serial to ATM and Frame Relay * Configuring all of the common IP routing protocols (RIP, EIGRP, OSPF, and BGP) * Configuring authentication * Configuring other services, including DHCP and NTP * Setting up backup links, and using HSRP to configure backup routers * Managing the router, including SNMP and other solutions * Using access lists to control the traffic through the router If you work with Cisco routers, you need a book like this to help you solve problems quickly and effectively. Even if youre experienced, the solutions and extensive explanations will give you new ideas and insights into router configuration. And if youre not experienced--if youve just been given responsibility for managing a network with Cisco routers--this book could be a job-saver.

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Cisco IOS Cookbook
Kevin Dooley
Ian Brown

Copyright 2008 O'Reilly Media, Inc.

OReilly Media Preface Cicso routers are nearly ubiquitous in IP networks - photo 1

O'Reilly Media

Preface

Cicso routers are nearly ubiquitous in IP networks. They are extremely flexible and reliable devices. The number and variety of features grows with each new release of the Internetwork Operating System (IOS). And while Cisco Press and several other publishers supply excellent documentation of these features both online and in a variety of books, it is often difficult to know when, why, and how to use these features. There are often many different ways to solve any given networking problem using Cisco devices. Some of these solutions are clearly more effective than others.

The most pressing question in the mind of you, the network engineer, is which of the many potential solutions is the most appropriate for your particular situation. And once you have decided to use a particular feature, the next question is how to actually implement it. Unfortunately, the feature documentation that describes a particular command or feature frequently does very little to answer either of these questions.

Indeed, there are many cases in which the Cisco IOS and documentation offers solutions that will make the network extremely difficult to support in the long term. These solutions are legitimate in odd special situations, but we strongly believe that they should be avoided in most production networks. In some cases this is because there are features that open potentially serious security holes in their default modes. In other cases, there are features that can render the network exceedingly difficult to manage effectively (policy-based routing is the classic example of this problem). Everybody who has worked with Cisco routers for any length of time has at one time or another had to ask their friends and co-workers for example router configuration files that show how to actually solve a common problem. A good working configuration example can often save huge amounts of time and frustration when implementing a feature that youve never used before. This is often true even when you already understand the theory behind this feature. This is why we have written this book.

We dont intend the Cisco IOS Cookbook to replace the detailed feature documentation included in books like Cisco IOS in a Nutshell, Second Edition, by James Boney (OReilly), or information available on Ciscos web site (http://www.cisco.com). We dont have the space to tell you in detail about how particular protocols actually work. This is information that you can find in places like the Internet Engineering Task Force (IETF) Request for Comment (RFC) documents, as well as a wide variety of books.

Instead, this book is a complement to those sources of information. They will tell you things like what a routing protocol is, how it works, and which command turns it on. We will help you select the right routing protocol and configure it in the most efficient way for your network.

This book includes a collection of sample router configurations and scripts that we have found useful in real-world networks. It also includes, wherever possible, our advice on what features to use in which situations and how to use them most effectively. There are many common mistakes that we have seen before (although we rarely make mistakes ourselves), and we want to help you to avoid making these same mistakes yourself.

Whats New in This Edition

The first important difference between the first and second editions of this book is visible right on the cover: we changed the title from Cisco Cookbook to Cisco IOS Cookbook . We had two main reasons for making this change. First, its more accurate. Cisco has several different product lines with completely different configuration interfaces. This book just covers the Cisco Internetwork Operating System (IOS), the software that runs on most of Ciscos routers and switches. It doesnt cover PIX or ASA firewall configuration or content switching or Ciscos Intrusion Detection Systems (IDS), for example.

The second reason for the change is that somebody might one day want to write a Cisco firewall or content switching or IDS cookbook. In fact, several readers have written to us asking for such things, although having just completed the marathon process of updating this book, neither of us feels a burning desire to undertake such a project right away.

For the second edition, we had two main goals. The first was to update the information for the first edition so that it now reflects IOS Version 12.4. And our second goal was to add some of the new topics, like MPLS and IPv6, which have become more relevant since the first edition was published. Many of these ideas came from reader suggestions. However, Cisco rarely deletes features from its software when it creates a new version, so we have also retained most of the content from the first edition of this book.

This means that much of the content in this book is also relevant to lower IOS versions. We have tried to make it clear when certain features were introduced, or if they are only available with certain IOS feature sets.

In each chapter, whenever there were relevant and useful new features, we have added new recipes showing how to use these features effectively. And when there were modifications to existing features, we have added information to the existing recipes.

We have also written four new chapters on topics that either were requested by readers, or that we felt were interesting and important. The new chapters cover IP Mobility, IP Version 6, MPLS, and Security, respectively.

In all, this edition contains 89 entirely new recipes, and we have deleted two old ones, one because we didnt feel it was still the best solution to the problem, and the other because it made sense to absorb its content into another recipe. We have made significant updates to existing recipes in every chapter, mostly to describe useful new options to existing commands.

We welcome feedback from our readers. If you have comments, suggestions, or ideas for other recipes or topics that youd like to see covered, please let us know. Just as we did with this edition, if there are additional future editions of the Cisco IOS Cookbook , we will include any suggestions that we think are especially useful. You can reach us at or ijbrown@hotmail.com .

Organization

As the name suggests, the Cisco Cookbook is organized as a series of recipes. Each recipe begins with a problem statement that describes a common situation that you might be faced with. After each problem statement is a brief solution that shows a sample router configuration or a script that you can use to resolve this particular problem. Then we turn to a discussion section where we describe the solution, how it works, and when you should or should not use it.

We have tried to construct the recipes so you can turn directly to the one that addresses your specific problem and find a useful solution without needing to read the entire book. If the solution includes terms or concepts that you are not familiar with, the chapter introductions should help to bridge the gap. And many recipes refer to other recipes or chapters that discuss related topics. We have also included a variety of references to other sources in case you need more background information on a particular subject.

The chapters are organized by the feature or protocol discussed. So, if you are looking for information on a particular feature such as NAT, NTP, or SNMP, you can turn to that chapter and find a variety of related recipes. Most of the chapters list the more basic problems first, and any unusual or complicated situations last. But there are some exceptions to this, when we have opted instead to group related recipes together.

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