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Harry Reynolds - JUNOS Enterprise Switching

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Harry Reynolds JUNOS Enterprise Switching

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JUNOS Enterprise Switching is the only detailed technical book on Juniper Networks new Ethernet-switching EX product platform. With this book, youll learn all about the hardware and ASIC design prowess of the EX platform, as well as the JUNOS Software that powers it. Not only is this extremely practical book a useful, hands-on manual to the EX platform, it also makes an excellent study guide for certification exams in the JNTCP enterprise tracks.
The authors have based JUNOS Enterprise Switching on their own Juniper training practices and programs, as well as the configuration, maintenance, and troubleshooting guidelines they created for their bestselling companion book, JUNOS Enterprise Routing. Using a mix of test cases, case studies, use cases, and tangential answers to real-world problems, this book covers:

  • Enterprise switching and virtual LANs (VLANs)
  • The Spanning tree protocol and why its needed
  • Inter-VLAN routing, including route tables and preferences
  • Routing policy and firewall filters
  • Switching security, such as DHCP snooping
  • Telephony integration, including VLAN voice

Part of the Juniper Networks Technical Library, JUNOS Enterprise Switching provides all-inclusive coverage of the Juniper Networks EX product platform, including architecture and packet flow, management options, user interface options, and complete details on JUNOS switch deployment.

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JUNOS Enterprise Switching
Harry Reynolds
Doug Marschke
Beijing Cambridge Farnham Kln Sebastopol Tokyo Special Upgrade Offer If you - photo 1

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Foreword
Scott Morris
Four-time CCIE and JNCIE-M, and a Juniper Networks Certified Instructor

Charles Darwin once said, I have called this principle, by which each slight variation, if useful, is preserved, by the term of Natural Selection. This principle of evolution applies to business as well as to nature. Individuals, companies, and industries evolve and compete with one another in preparation for the future.

Back in 1998, a group of engineers decided to split from the mainstream and form a new company, Juniper Networks. That company has evolved to create and acquire many products over the last decade. While Darwin might have viewed this as an evolutionary step in products, we view it as a competitive step.

Humankind differs from the rest of the animal kingdom not only because our instincts go beyond the primal survival urge (a.k.a. Darwins survival of the fittest), but also because of our intellect and capacity to improve. When one group splits off from another, it does not necessarily sound the death knell for the original group. More likely, the two groups will start taking steps to outdo one another. In other words, they compete.

Those who are not directly involved in that competition can reap the benefits of the intellectual sparring. We have observed many such competitive moves within the routing industry over the years. Now, we are entering another such arena within the switching side of our industry.

Evolution of the Bridging World

More than 20 years ago, Radia Perlman developed an interesting algorithm while working for Digital Equipment Corporation. At the time, it was meant to solve an irritating little problem brought on by the forced evolution of data networks. Although networking in 1985 was significantly different than it is today, its amazing how some of the basic building blocks have survived.

This book discusses some of those building blocks, both historically and with reference to the present-day network infrastructure. For example, the Spanning Tree Protocol, which was based on Perlmans algorithm, is like one of the amino acids from which todays switching was created. (Ive always despised biology, but it seems to fit here!)

Youll also learn how to improve on features weve always believed to be necessities just because they are. This book helps you understand the evolutionor stagnationof networking to date, and then shows you how to see past it and unlock your networking potential in a few short steps.

What Is the Big Deal About Switching Anyway?

Interestingly, Layer 2 networking in general, and Ethernet internetworking in particular, are technologies vastly overlooked by many people in the current networking world.

Ethernet has become a commodity. We see many a WAN link today delivered as an Ethernet handoff, which tells the tale of how common and simple it has become. And with it has emerged a number of supporting technologies and design mediums.

Many people see this area of networking as voodoo magic. That term implies it can be good as well as bad, but it doesnt explain why! Without waxing philosophical or launching a religious debate in this foreword, Ill leave it at this: you may learn things in this book that you knew only bits and pieces of before.

As we expand our networks to include IP telephony, data centers, or really large Layer 2 networks, we should pay attention to the details of many technologies that we have taken for granted over the years.

Even with as much Layer 2 experience as I have, serving as technical editor for this book has opened my eyes on several topics. It has spurred some entertaining debates, and perhaps it will do the same for you!

How This Book Will Help You (a.k.a. Whats in It for Me?)

I dont think better people could have been found to write this book. Doug and Harry not only have an incredible set of technical talentswhich Ive come to know over the yearsbut they also have a great sense of style. Although those virtues alone make them qualified, their track record of success in teaching, training, and consulting has also been put to use for your edification.

Too many technical books jump off the Boring Board into the abyss of Techie Soup. While this book covers plenty of deep technical matters, I think you will find its approach refreshing and compelling.

Now, I cant guarantee that it will lead to any evolutionary process in your own life. But I can certainly say that after you read it, youll have some eye-opening conversations (at least with yourself!). This book will help you quickly acquire knowledge surrounding the topics presented, and it will add to your successful implementation of those technologies.

One thing Ive gained from being part of this books evolutionary process is the burning desire to dive in and get my hands on these switches to see what they can do. While that may not mean much to some of you, anyone who has perused my personal lab on the Internet should understand.

Evolution is progress. The antithesis of that is Congress.... No, sorry, wrong dissertation. The antithesis of that is stagnancy. We should always strive to find new ways to improve our conditions. Whether you apply that to your personal life or to networking, it has the ring of truth.

Darwin said, In the long history of humankind (and animal kind, too) those who learned to collaborate and improvise most effectively have prevailed. Let us go forth and collaborate on and improvise our internetworking.

At the very least, as you go through this book and pay attention to the details, youll feel like Saturday Night Lives Church Lady: Well.... Isnt that special!

Preface

It wasnt but a day or so after we finished JUNOS Enterprise Routing, the companion book to this one, that our editor started pressuring us to start writing again. Writing a book may seem easy on the surface; how hard could it have been to write some words on these pages? But in reality, writing a book is a time-consuming and collaborative effort that affects everyone close to you. Also, at the time of the request, the EX Series was a new product line, and although we had extensive experience in the switching space, we did not have many customer deployments of the EX Series switches.

We were really impressed when the first EX units arrived for us to put in the rack that we reserved for this book. As JUNOS experts, we expected a lot, and we were impressed at the ease of configuration and stability that the JUNOS software provided to the EX. Although the performance and configuration of the EX switches are slightly different from those of a JUNOS router, the EX platform fit our needs, and hopefully it will fit yours, too.

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