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TORA builds and maintains a [[Directed acyclic graph|Directed Acyclic Graph]] rooted at a destination. No two nodes may have the same height.
[[Information]] may flow from nodes with higher heights to nodes with lower heights. Information can therefore be thought of as a fluid that may only flow downhill. By maintaining a set of totally-ordered heights at all times, TORA achieves loop-free multipath routing, as information cannot 'flow uphill' and so cross back on itself
==See Also==
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