This was in my Cisco training. Unidirectional line break.
No. I don't speak Japanese. Or whatever that is.
this post was submitted on 12 Feb 2026
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iiiiiiitttttttttttt
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you know the computer thing is it plugged in?
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Ya it came from an exercise about STP Loop Guard. Cool.
Plugging in a VOIP phone to the same switch with both interfaces will have a similar effect if loopguard is not enabled.
I will try that! Actually, I've accidentally done that shit in Prod. I connected our 10g and our 1g networks with a virtual switch in a Proxmox server. I undid it shortly after that, but it caused a network storm that impacted customers in 2 datacenters.