[161396] in North American Network Operators' Group
Re: traffic accounting
daemon@ATHENA.MIT.EDU (Joe Abley)
Tue Mar 12 10:39:11 2013
From: Joe Abley <jabley@hopcount.ca>
In-Reply-To: <43100.1363098742@turing-police.cc.vt.edu>
Date: Tue, 12 Mar 2013 10:38:31 -0400
To: Valdis.Kletnieks@vt.edu
Cc: "nanog@nanog.org \(nanog@nanog.org\)" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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On 2013-03-12, at 10:32, Valdis.Kletnieks@vt.edu wrote:
> On Tue, 12 Mar 2013 09:25:29 -0400, Joe Abley said:
>=20
>> Imagine you have a number of GE and 10GE interfaces spread across =
multiple
>> MX-class Juniper routers, and for each interface you want to maintain =
an
>> accurate count of bytes sent, categorised by destination address.
>=20
> An important question that may impact possible solutions - exactly how
> accurate does it have to be?
Ideally I'd count every byte, and any deficiencies in the data would be =
due to unplanned outage rather than systematic short-cutting.
Sampling 1 in 10 packets and multiplying the observed byte count by 10 =
might be better than nothing, though.
Off-list, someone suggested DCU ("destination class accounting"), but =
that's limited to 126 classes of counters; another parameter I forgot to =
mention at the beginning is that there are thousands of destination =
addresses reached through each of these interfaces, and I'm looking for =
accounting by destination address, so 126 isn't going to cut it.
Joe=
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