[address-policy-wg] 2005-01 - Last Call for Comments (HD-ratio Proposal)
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Geoff Huston
gih at apnic.net
Wed Feb 22 21:59:02 CET 2006
At 04:00 AM 23/02/2006, Randy Bush wrote: > > I trust that this report is helpful in terms of assessing some of the > > impacts of the proposal. > > > > ... > > > > From the simulations of registry allocations, the use of an HD Ratio of > > 0.96 for IPv4 address allocations made by the RIPE NCC is predicted to > > increase total address consumption by 46% over the existing flat 80% > > utilization allocation policy framework. > >YIKES!!!! > >and, aside from that, how was the play, mrs. lincoln? I was also surprised by this number when I first saw it in the output. Looking behind this 46% number, the outcome is a result of the amplified effects of the HD Ratio for large allocations. 50% of this increased address consumption is in allocations of /9 and /10 prefixes, which only account for 1% of all actual allocations, but 20% of the allocated addresses. The other effect is a shift from /16 to /15 allocations in this HDR regime - /16s and /15s together contribute a further 15% to this increased address consumption. Here's the table that shows the shifts when using the HD Ratio (fixed width font will help here) Prefix RIPE NCC Equivalent Allocations Allocations 2000-2006 0.96 HD (Relative %) (Relative %) /24 23.04 23.23 /23 12.09 11.37 /22 8.16 7.87 /21 4.76 4.85 /20 19.64 16.33 /19 14.97 15.21 /18 6.85 8.58 /17 3.56 4.39 /16 4.36 3.88 /15 1.18 2.39 /14 0.66 0.86 /13 0.38 0.5 /12 0.18 0.28 /11 0.13 0.15 /10 0.03 0.09 /9 0 0.02 /8 0 0 Power of Address Address Difference Relative Relative Relative 2 Span Span Difference Address Address Actual HDR Span Span Actual HDR 8 5898 5947 49 0% 0% 0% 9 6190 5821 -369 0% 0% 0% 10 8356 8059 -297 0% 0% 0% 11 9748 9933 184 0% 1% 0% 12 80445 66888 -13558 -2% 4% 2% 13 122634 124600 1966 0% 7% 5% 14 112230 140575 28344 3% 6% 5% 15 116654 143852 27197 3% 6% 5% 16 285737 254280 -31457 -4% 15% 9% 17 154665 313262 158597 19% 8% 12% 18 173015 225444 52429 6% 9% 8% 19 199229 262144 62915 7% 11% 10% 20 188744 293601 104858 12% 10% 11% 21 272630 314573 41943 5% 15% 12% 22 125829 377487 251658 30% 7% 14% 23 0 167772 167772 20% 0% 6% 24 0 0 0 0% 0% 0% Total 1862005.76 2714237.44 852231.68
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