90 IPv6 sub-TLA allocations made
Joao Luis Silva Damas joao at ripe.net
Wed Aug 15 16:03:50 CEST 2001
Hi, I think the RIR staff working on the new policy draft understand the issue. I believe the new draft will reflect this by moving away from a fixed percentage to using the huitema/durand ratio which is meant to give a consistent view of space utilization when using variable levels of hierarchy. Joao Damas RIPE NCC At 17:27 +0100 14/8/01, Peter Willis wrote: >Colleagues, > >I've just done some calculations that shows the maximum theoritical >utilisation that can be achieved is 75% whilst maintaining the minimum size of >routing table. That is if you take a large number of subnets, each subnet > containing a random number of hosts, and assign to each subnet the nearest > power of 2 larger than the number of hosts, the utilisation you get is 75%. > >This is a 75% utilisation per level of network hierarchy. > >So if we assume 3 levels of network hierarchy and each level doing perfect > routing aggregation and perfect address allocation we will get an overall > utilisation of > 0.75^3 = 0.422 == 42% overall utilisation for the TLA. > >I'd like to bet that if we have a network with enough hosts to justify 64 bits >of address space it'll also be large enough to require more than 3 levels of >network hierarchy. Any requirements to get high address space utilisation out >of IPv6 can simply be demonstrated to lack scaling qualities. > >Regards, > > >------------------------------------------------------------------------------- >Peter Willis | E-mail: peter.j.willis at bt.com >IP Technology Strategist | Phone: 01473 645178 Fax: 01473 644506 >BTexact Technologies CTO | >------------------------------------------------------------------------------- --
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