Path Vector Algorithms

Path Vector Algorithms, such as BGP, are similar to a distance vector protocol. The major difference between the two is that instead of looking at just distance to determine a loop free path to the destination, various other attributes are considered instead, in the case of BGP:

  • Autonomous system path (AS_Path)
  • Multi exit discriminator (MED)
  • Origin
  • Next hop
  • Local preference
  • Atomic aggregate
  • Aggregator

Path vector protocols such as BGP guarantee a loop free path by keeping records of each autonomous system (AS) that the route advertisement traverses. If the router receives an advertisement where it is already part of the AS_Path, it is rejected.



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