[address-policy-wg] 2005-01 - Last Call for Comments (HD-ratio Proposal)
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Rene Wilhelm
wilhelm at ripe.net
Thu Feb 23 02:43:47 CET 2006
Hi Geoff, > I was also surprised by this number [46%] when I first saw it in the output. Your number is higher, but the analysis I did also showed HD ratio could have a significant impact on the address space consumption. (http://www.ripe.net/ripe/policies/proposals/comments/impact_of_hd.html posted on this list some weeks ago) Looking at all invidual allocations done by RIPE NCC between 2003 and 2006, we modelled the observed growth to a policy which used HDR 0.96 instead of 80% utilisation as the criterium for an LIR to be eligible to receive an additional allocation. Starting 1/1/2003 and stepping through time the simulation thus determined the address space held by each LIR on a day by day basis. By 1/1/2006 this resulted in some 60 million (about 30% of the total) more addresses allocated compared to what we actually had handed out under the 80% rule. Reading your report, I believe one of the reasons our numbers differ is that you are simulating 10,000 allocations; my analysis only looked at the 5,121 allocations done by RIPE NCC in 2003-2006. Since the effects of HD ratio are progressive, the more allocations you simulate, the higher the relative increase in address space consumption becomes. > This experiment has been repeated 1,000 times in order to determine a > stable average value for the relative increase in address consumption > corresponding to a change in the address allocation policies from uniform > 80% to an HD Ratio of 0.96, assuming constant demand for addresses. To get a feeling of how stable your average is, could you indicate what the variation, the standard deviation in these 1,000 repeats is? i.e. did all 1000 give you a number close to 46% or were they spread out a lot? > A related consideration is that of the adoption of such a policy proposal > by all 5 RIRs. >From http://www.arin.net/policy/proposals/proposal_archive.html I understand ARIN already abandoned two proposals to use HD ratio for IPv4 allocations (nrs. 2004-2 and 2003-10). Regards, -- Rene =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Rene Wilhelm RIPE Network Coordination Centre Email: wilhelm at ripe.net Amsterdam, the Netherlands Phone: +31 20 535 4417 Fax: +31 20 535 4445 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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