> 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
