PCH Peering Paper

[woody at pch.net (Bill Woodcock)]

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 at 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
>