Juniper MX Series

902 Pages·2012·53.015 MB·English

by  Douglas Richard Hanks Jr., Harry Reynolds

Juniper MX Series
Douglas Richard Hanks, Jr. and Harry Reynolds
Beijing • Cambridge • Farnham • Köln • Sebastopol • Tokyo
Juniper MX Series
by Douglas Richard Hanks, Jr. and Harry Reynolds
Copyright © 2012 Douglas Hanks, Jr., Harry Reynolds. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.
O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions
are also available for most titles (http://my.safaribooksonline.com). For more information, contact our
corporate/institutional sales department: 800-998-9938 or [email protected].
Editors: Mike Loukides and Meghan Blanchette Indexer: Bob Pfahler
Development Editor: Patrick Ames Cover Designer: Karen Montgomery
Production Editor: Holly Bauer Interior Designer: David Futato
Copyeditor: Absolute Service, Inc. Illustrator: Rebecca Demarest
Proofreader: Rachel Leach
October 2012: First Edition.
Revision History for the First Edition:
2012-09-24 First release
See http://oreilly.com/catalog/errata.csp?isbn=9781449319717 for release details.
Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of
O’Reilly Media, Inc. Juniper MX Series, the image of a tawny-shouldered podargus, and related trade
dress are trademarks of O’Reilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as
trademarks. Where those designations appear in this book, and O’Reilly Media, Inc., was aware of a
trademark claim, the designations have been printed in caps or initial caps.
While every precaution has been taken in the preparation of this book, the publisher and authors assume
no responsibility for errors or omissions, or for damages resulting from the use of the information con-
tained herein.
ISBN: 978-1-449-31971-7
[LSI]
1348575579
Dedicated to my wife and my parents. You guys
are the best. Love you.
—Douglas

I would like to acknowledge my wife, Anita, and
our two lovely daughters, Christina and Marissa,
for once again understanding and accommodating
my desire to engage in this project. And thanks to
Doug, that plucky young lad who managed to
goad me into engaging in this project when my day
job was already rather action-packed. A special
thanks to my manager, Andrew Pangelinan at
Juniper Networks, for his understanding and
support in this project.
—Harry

Table of Contents
About the Authors ........................................................... xv
Preface .................................................................... xvii
1. Juniper MX Architecture .................................................. 1
Junos 2
One Junos 3
Software Releases 3
Three Release Cadence 4
Software Architecture 5
Daemons 6
Routing Sockets 11
Juniper MX Chassis 13
MX80 14
Midrange 17
MX240 18
MX480 20
MX960 21
Trio 24
Trio Architecture 25
Buffering Block 26
Lookup Block 27
Interfaces Block 28
Dense Queuing Block 30
Line Cards and Modules 30
Dense Port Concentrator 31
Modular Port Concentrator 32
Packet Walkthrough 41
Modular Interface Card 44
Network Services 46
Switch and Control Board 47
vii
Ethernet Switch 48
Switch Fabric 52
J-Cell 55
MX Switch Control Board 57
Enhanced MX Switch Control Board 60
MX2020 61
Architecture 61
Summary 67
Chapter Review Questions 69
Chapter Review Answers 70
2. Bridging, VLAN Mapping, IRB, and Virtual Switches .......................... 71
Isn’t the MX a Router? 71
Layer 2 Networking 73
Ethernet II 73
IEEE 802.1Q 74
IEEE 802.1QinQ 75
Junos Interfaces 77
Interface Bridge Configuration 80
Basic Comparison of Service Provider versus Enterprise Style 80
Service Provider Interface Bridge Configuration 83
Tagging 84
Encapsulation 87
Service Provider Bridge Domain Configuration 91
Enterprise Interface Bridge Configuration 94
Interface Mode 94
VLAN Rewrite 97
Service Provider VLAN Mapping 99
Stack Data Structure 99
Stack Operations 100
Stack Operations Map 103
Tag Count 106
Bridge Domain Requirements 107
Example: Push and Pop 107
Example: Swap-Push and Pop-Swap 109
Bridge Domains 111
Learning Domain 112
Bridge Domain Modes 115
Bridge Domain Options 131
Show Bridge Domain Commands 135
Clear MAC Addresses 137
MAC Accounting 139
Integrated Routing and Bridging 141
viii | Table of Contents