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Efficient IPv6 Pool Management Strategies for Improved Address Space Utilization

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Learn about balancing conservation and aggregation in IPv6 management practices, the concept of Sparse Allocation, collision issues, and potential solutions to maximize long-term aggregation potential and minimize fragmentation. Explore the benefits of using multiple allocation pools and the importance of policy considerations in address pool management.

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Efficient IPv6 Pool Management Strategies for Improved Address Space Utilization

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  1. APNIC IPv6 Pool Management Sanjaya, Services and Operations Director

  2. Overview • Background • Current practice • Issues discovered • Solution • Policy considerations

  3. Background • There are two IP address management principles which need to be balanced Conservation Aggregation

  4. Background • IPv4’s limited space put emphasis on conservation over aggregation • Results in heavily fragmented space and complex/large global routing table Conservation Aggregation

  5. Background • IPv6’s huge space puts emphasis on aggregation over conservation • Policies and practices should maximize long-term aggregation potential Conservation Aggregation

  6. What is Sparse Allocation? Sequential Allocation: 1 2 3 4 5 6 7 8 = reservation Sparse Allocation: 1 5 3 7 2 6 4 8

  7. Collisions • Mixing large (fast-growing) and small (slow-growing) blocks in the same sparse allocation pool is problematic • Early collisions result in disaggregation • “Same size fits all” creates fragmentation S S L S S S S S Collision S = Small block L = Large block

  8. Multiple Pools • Use multiple large allocation pools • For example, one pool for very large/fast-growing blocks, the other for “normal” • Reduced fragmentation as the larger blocks have more room to grow • Still an informal “best effort” strategy • We cannot predict the future!

  9. Current Practice • APNIC currently has a single /12 IPv6 block (delegated 3 October 2006) • Two sparse allocation pools • /13 pool for large (fragmented to /17) • /13 pool for small/medium (fragmented to /24) • No reservations • So far, so good • But, collision is coming • Need additional pools for better management

  10. Future Practice • Designate additional separate IPv6 pools • Introduce internal, administrative “reservations” • Requires additional /12 from IANA • APNIC will qualify under global policy • Can submit IANA request shortly

  11. IPv6 Address Pool Map Example *) Reservations can expire and the space will be optimally used

  12. Selection Process • APNIC/NIR hostmasters select pool on: • Economy size, population etc • ISP market share, customer base, plans, etc • Note: still a best-effort process • Aim is to be “good” not “perfect”

  13. Reservation Conditions • Currently considered as an internal/administrative practice • Reservations are not registered or certified • i.e. no authority to advertise or route • Never guaranteed • May be advised to holder • Will be reallocated if/when necessary

  14. Policy Considerations • Address pool management (including sparse allocation and reservation) is currently considered as administrative practice • Chosen by APNIC staff/Secretariat • Must be consistent with all address policies • Should any part of it be formalised in Policy? • Community decision • Proposals welcome as always

  15. Questions?

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