Vincent Bernat: A non-interactive introduction to the spanning tree protocol

Imagine you rent office space for a three-day event. You quickly set up a few Ethernet switches and tape some cables on the floor to get everyone online. Unfortunately, Stan, your clumsiest coworker, kicks out a cable every time he gets up for coffee. Spare cables would fix that, but a loop turns into a broadcast storm: Ethernet packets multiply until nothing else gets through. That’s where the spanning tree protocol comes in: it blocks just enough of the spare…

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