Re: PCH Peering Paper

["Bill Woodcock" <woody () pch net>]

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 <owen () 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