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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.
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