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). That sounds too aggressive for the middle mile. Dont you think so?
On Sat, Aug 15, 2015 at 10:51 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. > > YMMV. > > Owen > > > On Aug 15, 2015, at 10:07 , Glen Kent <glen.k...@gmail.com> wrote: > > > > Hi Bill, > > > > Just making sure that i get your point: > > > > Youre saying that the probability of packet drop at peering points would > > roughly match that at the edge. Is it? I thought that most core switches > > have minimal buffering and really do cut-through forwarding. The idea is > > that the traffic that they receive is already shaped by the upstream > > routers. > > > > Glen > > > > > > > > On Sat, Aug 15, 2015 at 10:33 PM, William Herrin <b...@herrin.us> wrote: > > > >> On Sat, Aug 15, 2015 at 12:47 PM, Glen Kent <glen.k...@gmail.com> > wrote: > >>> Is it fair to say that most traffic drops happen in the access layers, > or > >>> the first and the last miles, and the % of packet drops in the core are > >>> minimal? So, if the packet has made it past the first mile and has > >>> "entered" the core then chances are high that the packet will safely > get > >>> across till the exit in the core. > >> > >> Hi Glen, > >> > >> I would expect congestion loss at enough peering points (center of the > >> core) to put it in the same league as noisy cable at the edge. > >> > >> Regards, > >> Bill Herrin > >> > >> > >> > >> -- > >> William Herrin ................ her...@dirtside.com b...@herrin.us > >> Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/> > >> > >
