PA and PI assignments

• Provider Aggregatable (PA)
  • customer uses addresses out of registry’s allocation
  • good for minimising size of routing tables
  • but customer has to renumber if changing ISP
• Provider Independent (PI)
  • customer gets separate range of addresses
  • customer keeps addresses when changing ISP
  • customer may experience routing problems
  • bad for routing tables
• APNIC requires ‘Provider Aggregatable’

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