Aggregatable Global Unicast Addresses

• Address allocation:“provider-based” plan

• Format: TLA + NLA + SLA + 64-bit interface ID

• TLA = “Top level aggregator.” (13 bits)

  • Ranges of TLA values allocated to various registries
  • For “backbone” providers or “exchange points”

• NLA = “Next Level Aggregator” (32 bits)

  • Second tier provider and a subscriber
  • More levels of hierarchy possible within NLA

• SLA = “Site level aggregator” = 16 bits for link

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