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Spanning Tree Protocol is used to prevent layer-2 loops which would cause broadcast storms in a LAN.

The developer of Spanning Tree was Dr. Radioa Perlman of Sun. He wrote a poem about the spanning tree idea, here it is:

"Algorhyme" by Dr. Radia Perlman[edit]

I think that I shall never see
A graph more lovely than a tree.
A tree whose crucial property
Is loop-free connectivity.
A tree which must be sure to span.
So packets can reach every LAN.
First the Root must be selected 
By ID it is elected.
Least cost paths from Root are traced
In the tree these paths are placed.
A mesh is made by folks like me 
Then bridges find a spanning tree.

(*) based on Joyce Kilmer's "Trees"




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