Overlay-to-Underlay Network Interactions: Document Your Hidden Assumptions
If you listen to the marketing departments of overlay virtual networking vendors, it looks like the world is a simple place: you deploy their solution on top of any IP fabric, and it all works.
You’ll hear a totally different story from the physical hardware vendors: they’ll happily serve you a healthy portion of FUD, hoping you swallow it whole, and describe in gory details all the mishaps you might encounter on your virtualization quest.
The funny thing is they’re all right (not to mention the really fun part when FUDders change sides ;).
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