[165670] in North American Network Operators' Group
Re: common method to count traffic volume on IX
daemon@ATHENA.MIT.EDU (Leo Bicknell)
Wed Sep 18 13:23:47 2013
From: Leo Bicknell <bicknell@ufp.org>
In-Reply-To: <20130917201523.GD3108@burnout.tpb.net>
Date: Wed, 18 Sep 2013 12:23:12 -0500
To: Niels Bakker <niels=nanog@bakker.net>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Sep 17, 2013, at 3:15 PM, Niels Bakker <niels=3Dnanog@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 =3D OUT nearly perfectly?
Most exchanges do everything possible to eliminate broadcast packets, =
and they don't allow multicast on the unicast VLAN's. So properly =
behaved you have a bunch of routers speaking unicast to each other. The =
only way to get a difference is if there is packet loss, IN - loss =3D =
OUT.
--=20
Leo Bicknell - bicknell@ufp.org - CCIE 3440
PGP keys at http://www.ufp.org/~bicknell/
