Hierarchical Routing

IPv6 Routing Hierarchy

• IPv4 addresses deployed without strategy
• January 2021
  • IPv4 Routes in BGP - 861,418
  • IPv6 Routes in BGP - 109,398
• Make better decisions to where your data should be send.
• We minimize the impact of memory in routing table through summarization
  • "Prefix relevant to the continent"

Routing Hierarchy 2001

• IPv6 2001: Prefix is in use by:
  • ARIN
  • LACNIC
  • RIPE
  • APNIC
  • AfriNIC
• The 2001 prefix can be found anywhere on Earth
• Complex routing tables

IPv6 Geographic Prefixes

• "You basically have a sing on the side of the world that says where to go"
• 2400 - APNIC
• 2600 - ARIN
• 2A00 - RIPE
• /19 to /22 block sizes based on region
  • Different mask depending on the region
• Simplifies routing tables around the world.