RE: [sig-policy]the size of sparse allocation

["Paul Wilson" <pwilson@apnic.net>]

> My personal question.
> 
> What would be a typical reservation size for large LIRs, say, 
> with 1 million subscribers, if the sparse allocation is implemented?
> 
> If the answer is around /20 or so, I guess /12 is OK for IANA-RIR 
> allocation size.

Dear Arano san,

Based on HD=0.80, a /23 provides up to 1,048,576 site addresses.  Therefore
a large LIR with a million subscribers would probably have a /23, assuming
each subscriber gets a /48.

If an RIR has a /12, then after 2048 allocations under a sparse allocation
system, the maximum allocation size (or "reservation" as you put it) would
be /23.  After this time, an ISP requiring more than a /23 would need to
receive a separate block.

This situation would occur today if all RIR member LIRs transitioned to
IPv6, since at least one RIR has more than 2048 member LIRs, and a number of
those LIRs would qualify for more than a /23.

Perhaps this type of analysis gives us a means to determine whether a /12
allocation from IANA is large enough?

Paul
APNIC.


> 
> Regards,
> Arano
> 
> 
> At 12:56 03/08/27, Takashi Arano wrote:
> >Hi,
> >
> >the outline of IPv6 sparse allocation policy proposal got 
> consensus in 
> >both SIG and AMM as I previously mailed.
> >
> >One issue still remains about the size of allocation (from IANA to 
> >RIRs), /8 or /12. Let's discuss this in this mailing list.
> >
> >Regards,
> >Takashi Arano
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