Gartner Research

Exercise Caution Before Stretching VLANs

Published: 22 March 2018

ID: G00353284

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


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


  • Stretched VLANs


  • 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

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