Gartner Research

Exercise Caution Before Stretching VLANs

Published: 22 March 2018

ID: G00353284

Analyst(s): Andrew Lerner , Mark Jaggers , Ron Blair

Summary

Stretching VLANs appears as an easy way to interconnect separate physical data centers and simplify disaster recovery. However, I&O leaders responsible for connecting data center networks should be wary, as there are substantial risks to implementing the technology.

Table Of Contents
  • Key Challenges

Introduction

  • Stretched VLANs

Analysis

  • Avoid Making a Shortsighted Decision to Implement VLAN Stretching
    • Technological Risks
  • Invest in Global Load Balancing, DDI and/or ITRO Tools
    • Simplify IP and DNS Changes
  • Use VLAN Stretching as a Last Resort
    • Don't Stretch for DR
    • Use Cases Where Stretching Isn't That Bad
  • Following Specific Practices When Stretching VLANs

Gartner Recommended Reading

©2019 Gartner, Inc. and/or its affiliates. All rights reserved. Gartner is a registered trademark of Gartner, Inc. and its affiliates. This publication may not be reproduced or distributed in any form without Gartner’s prior written permission. It consists of the opinions of Gartner’s research organization, which should not be construed as statements of fact. While the information contained in this publication has been obtained from sources believed to be reliable, Gartner disclaims all warranties as to the accuracy, completeness or adequacy of such information. Although Gartner research may address legal and financial issues, Gartner does not provide legal or investment advice and its research should not be construed or used as such. Your access and use of this publication are governed by Gartner’s Usage Policy. Gartner prides itself on its reputation for independence and objectivity. Its research is produced independently by its research organization without input or influence from any third party. For further information, see Guiding Principles on Independence and Objectivity.

Already have a Gartner Account?

Purchase this Document

To purchase this document, you will need to register or sign in above

Become a client