this post was submitted on 11 Dec 2023
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If you have no RSTP/MSTP you're just asking for trouble.
Switching loops are unlikely unless you have bad or non-existent documentation or someone new.
Or users
Fun story. I was tasked with figuring out a connection problem on a client's network. STP was enabled, but everyone having problems were all connected to one switch.
Some investigation later and STP's root port is not the expected root port....
After some investigation, a user took the ethernet cable for their computer (Daisy chained off their VoIP phone), and decided to store it, in the wall jack.... Across the office.
That was Jack was on a different switch, and it had a lower port cost than the primary root port between the switches, so naturally, let's send all inter-switch traffic over to this..... Telephone.
/Facepalm
The only switching hardware they should have physical access to is a dumb switch if absolutely needed. Then control the cables.
Yep. That happened once. The user plugged the cable for their laptop, from the dumb switch, into the same dumb switch and took out most of the network.