[rbridge] Non-Spanning-Tree bridges do exist
Harald Tveit Alvestrand
harald at alvestrand.no
Tue Oct 18 14:40:53 PDT 2005
My curiosity got the better of me....
I remembered that the el-cheapo switch I'm using as a junction box in my
office had 2 spare ports.
So I crawled under my desk and connected a wire between the two.
Sure enough, in a little while the two lamps turned green; a little later
the lamps started flashing, and just a few moments later, ALL the lamps on
the box started flashing.
I had created a broadcast storm.
I hurriedly disconnected the link, and the network went back to normal. End
Not all bridges implement spanning tree.
Users who have physical access to such a device, and connect wires without
thinking, can create broadcast storms.
But as long as the physical topology is a tree, they do no harm.
Not sure what implications this has for this group.
(note: Either this device is in category BLOCK, or it's TRANSPARENT, and
ALL the switches in my house, which are of about 4 different makes, all of
them cheap, fail to implement any form of ST - because I don't see any
BPDUs on the wire).
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