❒
Whenever routes are not used -> get expired -> Discarded
❍ Reduces stale routes
❍ Reduces need for route maintenance
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Minimizes number of active routes between an active source and destination
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Can determine multiple routes between a source and a destination, but implements only a single route, because
❍
Difficult to manage multiple routes between same source/destination pair
❍
If one route breaks, its difficult to know whether other route is available
❍
Lot of book-keeping involved