Hi Glen, If you first list the causes of a dropped packet, then you can figure out how likely they are at different points in time (first\last\peer\etc) by making some assumptions.
Here's an **example**: *Cause | Location | Likelihood* Congestion | Last mile | Low Congestion | First mile | Low Congestion | Peering | Medium Layer 1 | First mile | Low Layer 1 | Core | Low Layer 1 | Last mile | High You can even go as far as drawing a cause and effect diagram for each location. Then you can collect real world data and fine tune your assumptions. Rafael On Sat, Aug 15, 2015 at 11:47 AM, Glen Kent <glen.k...@gmail.com> wrote: > Hi, > > 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. Sure once it gets off the core, then all > bets are off on whether it will get dropped or not. However, the key point > is that the core usually does not drop too many packets - the probability > of drops are highest in the access side. > > Is this correct? > > Glen >
