Delayed Convergence Background(why does this happen?)

• Well known that distance vector protocols exhibit poor convergence behaviors

  • Counting to infinity, looping, bouncing problem

• RIP redefines infinity and adds split-horizon, poison reverse, etc.

  • Still, slow convergence and not scalable

• BGP advertises ASPaths instead of distance

  • Solves counting to infinity and RIP looping problem, but…
  • BGP can still explore “invalid” paths during convergence (i.e. the bouncing problem)

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