Algorhyme
"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 that must be sure to span, so packets can reach every LAN.
First the root must be selected, by ID it is selected
Least-cost paths from root are traced
In the tree these paths are placed
A mesh is made for folks by me, then bridges find a spanning tree."
--Radia Perlman