Arista交换机特性详解

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"Arista 技术特性.pdf" 是一本由 Gary A. Donahue 撰写的关于 Arista 交换机特性的技术资料，ISBN 为 978-1-449-31453-8。该书由 O'Reilly Media 出版，主要面向教育、商业或销售推广用途，并提供在线版本。书中涵盖了 Arista 交换机的各种技术细节，包括但不限于网络配置、性能优化、管理和监控等方面。 Arista Networks 是一家专注于数据中心网络解决方案的公司，其产品以其高性能、低延迟和可编程性而闻名。Arista 的交换机通常用于云数据中心、大型企业和科研机构，以支持大规模虚拟化和大数据应用。在本书中，读者可以期待学习到以下关键知识点： 1. **Arista EOS (Extensible Operating System)**：这是 Arista 交换机的核心操作系统，它提供了丰富的命令行接口（CLI）和基于 Web 的管理界面。EOS 提供了模块化设计，支持热补丁更新，确保了高可用性和稳定性。 2. **硬件架构**：Arista 交换机采用先进的芯片技术，如 ASIC 和 FPGA，以实现高速数据处理和低延迟通信。这些硬件特性对于金融交易、云计算服务和高性能计算至关重要。 3. **软件定义网络 (SDN)** 支持：Arista 的交换机支持 OpenFlow 和其他 SDN 控制协议，允许网络管理员通过集中式控制器进行灵活的网络策略配置。 4. **网络虚拟化**：Arista 提供了多租户和虚拟化功能，如 Virtual EOS (vEOS) 和 Virtual Switching Instance (VSI)，能够在一个物理设备上创建多个逻辑独立的网络环境。 5. **自动化和可编程性**：Arista 的 API 和 SDK 允许通过 Python、Java 或其他编程语言对网络进行自动化配置和监控，简化了运维工作。 6. **监控和故障排除工具**：EOS 提供了强大的诊断和性能监控工具，如 eAPI、eoscli 和 Arista Network State Analyzer (ansa)，帮助管理员实时了解网络状态并快速定位问题。 7. **安全性**：Arista 的交换机支持多种安全机制，包括访问控制列表 (ACL)、端口安全、IP Source Guard 和 MAC 地址绑定，以保护网络免受未经授权的访问。 8. **QoS (Quality of Service)**：Arista 交换机提供了精细的 QoS 设置，可以根据应用需求调整带宽分配，确保关键流量的优先级。 9. **冗余和高可用性**：Arista 的硬件和软件设计都考虑到了冗余，例如通过 Link Aggregation Control Protocol (LACP) 实现链路聚合，通过 StackWise Plus 实现堆叠冗余，以提高网络的可靠性。 10. **网络分析和优化**：Arista 的 NetMRI 和 Arista Network Visualizer 工具可以帮助分析网络流量，识别潜在瓶颈，以及进行网络优化。通过阅读 "Arista Warrior"，读者将深入理解 Arista 交换机的技术优势和最佳实践，从而更好地部署、管理和维护复杂的数据中心网络。这本书不仅适合网络工程师和技术决策者，也适合希望了解现代数据中心网络技术的任何人。

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Using Code Examples

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xiv | Preface

fond memories of the two of us sitting in front of my RadioShack Model III computer

while w

e entered basic programs from a magazine. I am where I am today largely because

of your influence, direction, and teachings. You made me the man I am today. Thank

you, Papa. I miss you.

This book would not have been possible without the significant help from the following

people at Arista Networks: Mark Berly, Andre Pech, Dave Twinam, Brad Danitz, Nick

Giampa, Doug Gourlay, and Kevin McCabe. I’d also like to personally thank Jayshree

Ullal, CEO of Arista, for allowing me access to some of the Arista equipment used for

examples in this book. This book would simply not have been possible without all of

your time and generosity.

A special word of thanks is needed for Mark Berly. I met with Mark many times, and

probably emailed him 30 times a day for six months. It takes a special kind of person to

tolerate me in the first place, but putting up with my nonstop questions takes someone

who is either as nuts as I am, or who really loves the subject at hand, or both. Thank you

for taking the time to answer my many hundreds of questions. This book would have

sucked without your many helpful insights.

I would like to thank Craig Gleason for his considerable help with VMware and for

putting up with my many ridiculous questions on the subject. The sections containing

VMware references would not have been possible without your help and enthusiasm.

I would like to especially thank Glenn Bradley with his help designing and implementing

my secret underground bunker. An entire chapter of this book would literally have not

been possible without your help. You also get special recognition for finding an error in

the 2nd edition of

Network Warrior that made it through two editions, two technical

editors, countless edits, and five years of public scrutiny. Not bad. Not bad at all.

I’d like to thank Bill Turner for always delivering what I needed without asking too many

questions. May your cowboy changes never cause an outage.

Once again, I would like to thank Michael Heuberger, Helge Brummer, Doug Kemp,

and the rest of the team in North Carolina for allowing me the chance to annoy and

entertain them all on a daily basis. Oh, and Jimmy Lovelace, too; just because I know

he’ll love to see his name here.

I would like to thank my editors, Mike Loukides for initially approving the project, and

Meghan (with an h!) Blanchette, for dealing with my quirks on an almost daily basis.

I would like to thank all the wonderful people at O’Reilly. Writing this book was a great

experience, due in large part to the people I worked with at O’Reilly. This is my third

project with O’Reilly, and it just never stops being great.

I would like to thank my good friend, John Tocado, who hopefully by now already knows

why. Thank you.

xvi | Preface

I still wish to thank everyone else who has given me encouragement. Living and working

ith a writer must, at times, be maddening. Under the burden of deadlines, I’ve no doubt

been cranky, annoying, and frustrating, for which I apologize.

My main drive for the last few months has been the completion of this book. All other

responsibilities, with the exception of health, family, and work, took a backseat to my

goal. Realizing this book’s publication is a dream come true for me. You may have dreams

yourself, for which I can offer only this one bit of advice: Work toward your goals and

you will realize them. It really is that simple.

Remember the tree, for the mighty oak is simply a nut that stood its ground.

A Quick Note About Versions

When

I started writing this book, EOS version 4.8.3 was the state-of-the art release from

rista. As I continued writing over the course of about a year, new versions of code came

out. As a result, there are a variety of code revisions used in this book ranging from 4.8.3

to 4.10, which was released after the first draft of the book was finished.

While I would have loved to have gone back and updated all the examples to reflect the

latest code, I simply ran out of time. Where there were significant changes or new fea

tures added, I made sure to use the latest code. In some cases, part of the chapter shows

exam

ples from one rev, while another part shows a different rev. I apologize in advance

if this confuses anyone, but I really don’t think there should be any issues because the

tech reviewers were great about pointing out where I needed to update my examples.

In my defense, the Arista team works so hard on releasing killer new versions of code

hat I had a hard enough time keeping up with new features, most of which I’m happy

to say were included in this book. Hopefully, when I get to write

Arista Warrior 2n

edition, I’ll get the opportunity to go through the entire book and update every example

to the latest rev of EOS.

A Quick Note About Code Examples

any of the examples involving code, I’ve had to slightly alter the output in order to

make it fit within the margins of this book. I’ve taken great pains to not alter the mean

ingful output, but rather to only alter the format. For example, in the output of show

top, the output includes lines that say something to the effect of:

last five minutes: 18.1%, last five seconds 3.1%.

In order to make the example fit, I might alter this to read:

last five mis: 18%, last five secs 3%.

Preface | xvii

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