Definition: PI and PA

• Provider Independent (Portable)

  • Customer holds addresses independent from ISP
  • Customer keeps addresses when changing ISP
  • Bad for size of routing tables
  • Bad for QOS: routes may be filtered, flap-dampened

• Provider Aggregatable (Non-portable)

  • Customer uses ISP’s address space
  • Customer must renumber if changing ISP
  • Only way to effectively scale the Internet

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