I could see it going through several private peering, but not through multiple exchanges.
Justin Wilson j...@mtin.net --- http://www.mtin.net Owner/CEO xISP Solutions- Consulting – Data Centers - Bandwidth http://www.midwest-ix.com COO/Chairman Internet Exchange - Peering - Distributed Fabric > On Aug 16, 2015, at 8:00 AM, Patrick W. Gilmore <patr...@ianai.net> wrote: > > On Aug 15, 2015, at 1:41 PM, Job Snijders <j...@instituut.net> wrote: >> On Sat, Aug 15, 2015 at 11:01:56PM +0530, Glen Kent wrote: > >>> Is there a paper or a presentation that discusses the drops in the core? >>> >>> If i were to break the total path into three legs -- the first, middle >>> and the last, then are you saying that the probability of packet loss >>> is perhaps 1/3 in each leg (because the packet passes through >>> different IXes). >> >> It is unlikely packets pass through an IXP more then once. > > “Unlikely”? That’s putting it mildly. > > Unless someone is selling transit over an IX, I do not see how it can happen. > And I would characterize transit over IXes far more pessimistically than > “unlikely”. > > > [Combining responses] > On Aug 15, 2015, at 1:21 PM, Owen DeLong <o...@delong.com> wrote: >> >> I would say that the probability of a packet drop at any particular peering >> point is less than the probability at one of the two edges. >> >> However, given that most packets are likely to traverse multiple peering >> points between the two edges, the probability of a packet drop along >> the way at one of the several peering points overall is roughly equal >> to the probability of a drop at one of the two edges. > > I’m a little confused why most packets are “likely to traverse multiple > peering points”? > > Most packets these days are sourced from one of three companies. (Which Owen > should know well. :) At least one of those companies published stats saying > the vast majority of packets are “zero or one” AS hop from the destination. I > cannot imagine Google or Netflix being 50% behind Akamai on that stat. Which > clearly implies most packets traverse “zero or one” AS hop - i.e. one or zero > peering points. > > Finally, I would love to see data backing up the statement that packets are > more likely to drop at one edge (assuming the destination?) than at a peering > point. > > -- > TTFN, > patrick > Justin Wilson j...@mtin.net --- http://www.mtin.net Owner/CEO xISP Solutions- Consulting – Data Centers - Bandwidth http://www.midwest-ix.com COO/Chairman Internet Exchange - Peering - Distributed Fabric
