[address-policy-wg] 2016-05 New Policy Proposal (Synchronising the Initial and Subsequent IPv6 Allocation Policies) - HD-ratio

Hi,

just a few bits of clarification...

On Tue, Dec 20, 2016 at 11:30:13AM -0500, JORDI PALET MARTINEZ wrote:
> I???ve decided to propose, for this discussion, 75%, following ARIN similar policy. I believe is a fair threshold when a network is expanding number of customers, to allow the ISP to plan ahead with sufficient anticipation.

Well, the reason for HD ratio is that a fixed utilization rate was seen
as "too unflexible to accomodate aggregation loss on multiple hierarchies",
especially in large networks - where HD ratio requires FAR less than 75%,
so that would be a large change towards a much more conservative(!) rule.

> So yes, you???re right that we could split the question in two:
> 1) Do you agree removing the HD-ratio and using a % utilization value instead?
> 2) If yes to 1), What % do you think is a good threshold?
> 
> My point of view is that HD-ratio makes it unnecesarily complex, and causes confusion if you???re using something different than /56, as the actual table in the existing policy works based on that, but you may be assigning /48, a mix of /48 and /56, or something else.

The "confusion" about /48 and /56 has been brought up a few times, and 
the NCC has made it clear that they consider "a single assigned /48" to
be the equivalent of "256 /56s" for the purpose of evaluating HD ratio.

Nothing really "complex" or "confusing" here - you count your /56s, you
look up the HD value that applies to your network size, and then you have
a clear "ratio reached / not reached" answer.

Gert Doering
        -- APWG chair
-- 
have you enabled IPv6 on something today...?

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