Well, I broke the spanning-tree topology at work today. It was not one of my proudest moments 🙂 I was playing around with the very delicate portfast command, which states in all its glory:
“%Warning: portfast should only be enabled on ports connected to a single
host. Connecting hubs, concentrators, switches, bridges, etc… to this
interface when portfast is enabled, can cause temporary bridging loops.
Use with CAUTION”
So ofcourse I had it hooked up to another switch, because I was convinced that I read somewhere, that even though this could happen, some still-unknown feature would save the topology…. Not so.
Another apparent need for redundancy is in the cellular network. The largest wireless carrier in Denmark, TDC had a couple of fibercables cut, and the entire cellular network in the country has been affected. Not good.