Sunday, January 6, 2013

How BGP select the best path.

BGP Attribute and Best Path



  • Step 1:   Prefer highest weight
  • Step 2:   Prefer highest local preference
  • Step 3:   Prefer route originated by the local router
  • Step 4:   Prefer shortest AS Path
  • Step 5:   Prefer lowest origin code
  • Step 6:   Prefer lowest MED
  • Step 7:   Prefer EBGP path over IBGP path
  • Step 8:   Prefer the path through the closest IGP neighbor
  • Step 9:   Prefer oldest route for EBGP paths
  • Step 10: Prefer the path with the lowest neighbor BGP Router ID

Foot Notes:
We Like Orange AS Orange Mean Pure Refreshment.

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