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It is also a source initiated
routing algorithm, creates multiple routes for any source/ destination pair.
The advantage of multiple routes is that route discovery is not required for every
alteration in the network topology.
TORA consists of three phases,
1. Route Creation/discovery
2. Route maintenance
3. Route erasure
TORA uses three types of packets:
Query Packets for route creation, Update Packets for both creation and
maintenance
The route will be discovered from
the source to destination only when a request is made for the transmission. In
this algorithm the source will generate a query packet which will be broadcasted
in the network this continues as long as a node that is directly connected to
the destination is identified.
When the destination is
identified an update packet will be generated and sent back to the source. The
update packet will have the path information if there are more than one update
packet received by the source, it means there are multiple paths to the
destination, the source has to choose best path available.
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