ASN Guidelines

• When do I need an AS?
  • Multi-homed network to different providers and
  • Routing policy different to external peers
• Factors that don’t count
  • Transition and ‘future proofing’
  • Multi-homing to the same upstream
    • RFC2270: A dedicated AS for sites homed to a single provider
  • Service differentiation
    • RFC1997: BGP Communities attribute
  • Recommended reading
    • RFC1930: Guidelines for creation, selection and registration of an Autonomous System

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