The frames on the switch go round and round, round and round and round and round
The frames on the switch go round and round, round and round and round and round
The frames on the switch go round and round, round and round and round and round
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Wouldn't something like spanning-tree just down all ports on this?
Yes.
If it’s present, and loop guard is enabled, it would block the ports. This looks like an unmanaged switch so probably doesn’t have that feature.
Most of Netgear’s managed switch range have a loop guard function, even if they don’t do full STP.