BGP Decision ProcessWhat is the deciding factor?

• Reason for path choice varies wildly depending on network architecture and peer choices

  • Border router, no policy: AS path length 5%, External BGP, 50%, IGP or router ID 45%
  • Core router, no policy: IGP or router ID
  • Policy usually accounts for 20% of path decisions where used

• Policy is not being used in most enterprise networks

  • Lack of expertise
  • Inability to achieve goals

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