yes, there is a good book about the QFX 5100
Juniper QFX5100 Series
by Douglas Richard Hanks, Jr.
Copyright © 2015 Douglas Richard Hanks, Jr. All rights reserved.
Printed in the United States of America.
Published by O’Reilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.
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Editors: Mike Loukides and Allyson MacDonald
Production Editor: Nicole Shelby
Copyeditor: Octal Publishing Services
Proofreader: Charles Roumeliotis
Indexer: Lucie Haskins
Interior Designer: David Futato
Cover Designer: Ellie Volckhausen
Illustrator: Douglas Richard Hanks, Jr.
December 2014: First Edition
Revision History for the First Edition
2014-11-17: First Release