Network Overlays: An Introduction

While network overlays are not a new concept, they have come back into the limelight, thanks to drivers brought on by large-scale virtualization. Several standards have been proposed to enable virtual networks to be layered over a physical network infrastructure: VXLAN, NVGRE, and SST. While each proposed standard uses different encapsulation techniques to solve current network limitations, they share some similarities. Let’s look at how network overlays work in general…

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