Studying the IPv4 routing table may lead us to a potential number of more specific routes, but would it lead us to any conclusions about their length? The Swiss example shows that the routes may not be subdivided from the most significant bits of the prefixes, so how do we do the analysis?
(Alas, I will not be making ap-wg, so here is something to think about)... I think, in order to come up with a normal figure, we need to normalise the data as best we can. Taking the average number of deaggregates per v4 allocation size should give us an idea of how much people may want to deaggregate their v6 allocation (which in this region is likely to be /32), Am in full acceptance of the fact that some people deaggregate for either other TE reasons (e.g high localpref and lack of community support by expensive upstream) or no good reason at all (i.e ignorance / assumptions about the way the internet works) This could lead us back to the /36 choice if , for instance, we found that on average there four v4 deaggregates (since deaggregating the standard v6 allocation of /32 to 4 deaggregates produces this). However, I do feel we need a model more comprehensive than this, I'd like to see not only a maximum length, but for this to be applied proportionately to the size of the allocation, I'm not comfortable allowing bigger folk to pollute by allowing them to deaggregate a larger allocation up to a fixed deaggregate size. Dave.
Remember, if this is to be a WG document, I'd like to attempt to reach consensus in the group (and I suspected that would never be easy), so all input is welcome!
Looking forward to an interesting 20 minute discussion in Prague, Rob
------------------------------------------------ David Freedman Group Network Engineering Claranet Limited http://www.clara.net