Switches, Hubs, and Modems
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switch loops

Occasional Visitor

switch loops

One of the employee in the office connected one patch cord back to another port of the switch.

Loop is created in the switch where port no 2 and port no 14 are connected by the same patch cable.

The total network was affected.

STP was alredy enabled on the switches but it didnt solve the loop problem.
Matt Hobbs
Honored Contributor

Re: switch loops

Spanning-tree should have blocked it, what switch do you have and what version firmware version are you running? Can you reproduce this? Try again with the latest firmware maybe.

Alternatively, if your switch supports it you may also want to enable 'loop-protect' which is a new feature included in the latest software for most of the current ProCurve switches.

You can read about this feature in the 5300xl release notes: