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On Feb 27, 2015, at 21:28, Mark Tinka email@example.com wrote:
On 28/Feb/15 03:08, David Farmer wrote:
If you only look at it through the lens of the current multi-homing requirement for an ASN then you don't need it, it is totally anticipatory and only a future need, but that is self-fulfilling. I'm suggesting that multi-homing is too narrow of a definition of need for an ASN. The PI assignment and what every justified that should also equally justify the need for ASN assignment. The PI assignment was intended to be portable, also assigning an ASN simply is intended to facilitate that portability. I'm saying that the need for portability is also a need for an ASN, if you look beyond multi-homing.
True, PI is meant to be portable, which is fine for IPv6 because we have a lot of address space.
But don't you worry that you will blow through 4.2 billion ASN's soon if PI allocation policy evolves to become liberal that 4.2 billion PI allocations become a reality?
If IPv6 PI allocations gets too liberal, the routing system as we know it will implode long before we allocate 4.2 billion ASNs. Restricting the number of ASNs in use in the routing system isn't really going to help that much. The total number of prefixes, PA or PI, has been the primary limiting factor historically. Limiting the portability of PI prefixes by not allocating ASNs won't save the routing system. Only ensuring that the growth in the number of prefixes, both PA and PI, is sustainable and doesn't exceed the growth in the prefix limit for the typical router in use in the Internet at any point in time will keep the current routing system going.
We need a new kind of routing system, we've known that for a while. But that is not a policy issues for the RIRs, that is a technology issues for the IETF and the IRTF. I think things like LISP and ILNP are promising in the long run. We just have to keep the current routing system going until those technologies can prove themselves. We do that by keeping total prefix growth sustainable, not by limiting portability of PI prefixes.