Deny Access to rogue switches.

[16again]

Michal,
Your link doesn't show how HP loop detection works, this one does:
http://lkhill.com/loop-detection-without-stp/

[Mike_ES]

Maybe not such detailed as your link to article (great details!), but basics are described well (please scroll down the article).

I think worth to look there due multi-port loopback-detection example.

Cheers!

Michal

[Dave Harrold]

Thanks for the replies everyone.  Not to find some time to test out in a lab. :-)