This assumes that there are no cooperatives providing settlement free peering which includes both peer and transit routes.
Owen > On Feb 17, 2016, at 14:09 , Bill Woodcock <wo...@pch.net> wrote: > > Each bit traverses only one peering session, however, at the "top of its > trajectory" to use a physical metaphor. The uphill and downhill sides are all > transit. > > > -Bill > > >> On Feb 17, 2016, at 14:06, Owen DeLong <o...@delong.com> wrote: >> >> >>> The premise above therefore devolves to: Since most of the traffic is to >>> those networks, then most of the bits flow over contracted peerings. >>> >>> Perhaps “most” can be argued, but obviously a significant portion of all >>> peering bits flow over contracted sessions. Hopefully we can all agree on >>> that. >> >> There’s greater complexity here, however… >> >> Many of the bits that flow flow over several networks between their source >> and destination. Likely the vast majority of bits traverse at least 3 >> autonomous systems in the process. >> >> So when you want to count traffic that went over a non-contract peering >> session vs. traffic that went over a contract peering session, how do you >> count traffic that traverses some of each? >> >> Owen >>
