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{{Redirect|TORA|the aviation term|Runway#Declared distances}} |
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[[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.
the key design concepts of TORA is localization of control messages to a very small set of nodes near the occurrence of a topological change.To accomplish this,nodes need to maintain the routing information about adjacent (one hop) nodes.The protocol performs three basic functions:
Route creation
Route maintenance
Route erasure
During the route creation and maintenance phases,nodes use a height metric to establish a directed acyclic graph(DAG) rooted at destination.Thereafter links are assigned based on the relative height metric of neighboring nodes.during the times of mobility the DAG is broken and the route maintenance unit comes into picture to reestablish a DAG routed at the destination.
Timing is an important factor for TORA because the height metric is dependent on the logical time of the link failure.
TORA's route erasure phase is essentially involving flooding a broadcast clear packet(CLR) throughput the network to erase invalid routes
==See also==
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