[183136] in North American Network Operators' Group
Re: Drops in Core
daemon@ATHENA.MIT.EDU (Glen Kent)
Sat Aug 15 13:09:29 2015
X-Original-To: nanog@nanog.org
In-Reply-To: <CAP-guGW9r-sZwzxcOipcYEqmjcy_Y+qpf3kFPdJagerA9jMwyA@mail.gmail.com>
Date: Sat, 15 Aug 2015 22:37:09 +0530
From: Glen Kent <glen.kent@gmail.com>
To: William Herrin <bill@herrin.us>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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 <bill@herrin.us> wrote:
> On Sat, Aug 15, 2015 at 12:47 PM, Glen Kent <glen.kent@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 ................ herrin@dirtside.com bill@herrin.us
> Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
>
