Re: Drops in Core

[William Herrin <bill () herrin us>]

On Sat, Aug 15, 2015 at 1:07 PM, Glen Kent <glen.kent () gmail com> wrote:
> 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.

Hi Glen,

It a capacity question. Several core networks [cough Verizon cough]
intentionally under-provision the "settlement-free" peering links to
other core networks. You can't cut-through when the destination
interface already has a queue of packets waiting to be sent.

Regards,
Bill Herrin



-- 
William Herrin ................ herrin () dirtside com  bill () herrin us
Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>