Re: common method to count traffic volume on IX

[Niels Bakker <niels=nanog () bakker net>]

* bicknell () ufp org (Leo Bicknell) [Wed 18 Sep 2013, 19:23 CEST]:
> On Sep 17, 2013, at 3:15 PM, Niels Bakker <niels=nanog () bakker net> wrote:
> > I don't know of any IXP that does this.  Industry standard is as 
> > you and others wrote before: the 5-minute counter difference on 
> > all customer-facing ports, publishing both input and output bps 
> > and pps.  I guess MRTG is to 'blame' for these values more than 
> > anything.
>
> Serious question, at an IXP shouldn't IN = OUT nearly perfectly?

Ding ding ding!  And that's why honest IXPs graph both, to show that 
they have no packet loss on their inter-switch links.

(Or, much more likely, measurement errors due to wrong config for the 
grapher)


        -- Niels.