Authors Note: I wrote 95% of this post just after VmWorld and just prior to the announcement of NVGRE. I was too lazy to go back and add something on this new proposed standard but as a different scheme for tunneling layer 2 over layer 3, it plays directly into the theme of this piece.
In the welcome post for The Whole Stack I wrote a bit about layering and abstractions. To that end, VXLAN was introduced with great fan fair at VmWorld. This announcement made me realize how similarly the data center network is evolving, as compared to what we have already seen in carrier IP backbones, specifically with Pseudo Wires and VPLS.
As someone who got into technology via networking, the venerable OSI model is often my guide. Of course this is a just a reference model and not a strict guide or a reflection of actual practice. The idea of “this over that networking,” and “almost anything over IP,” are marketing and technical truisms. Continue reading →
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