[183427] in North American Network Operators' Group
Re: NetFlow - path from Routers to Collector
daemon@ATHENA.MIT.EDU (Avi Freedman)
Tue Sep 1 20:27:14 2015
X-Original-To: nanog@nanog.org
To: rdobbins@arbor.net (Roland Dobbins)
Date: Tue, 1 Sep 2015 20:27:10 -0400 (EDT)
From: freedman@freedman.net (Avi Freedman)
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
(Said Roland:)
> Again, to clarify - I count VLANs/VRFs as being sufficiently out-of-band
> to handle flow telemetry on a reasonable basis without mixing it in with
> customer traffic.
>
> That changes the ratio.
<snip>
> I agree with you, Avi, and others that a dedicated OOB network *just for
> flow telemetry* doesn't make economic sense in most (any?) scenarios.
>
> What I'm saying is that it oughtn't to be mixed in with customer
> data-plane traffic. Ideally, all management-plane traffic would
> traverse a separate physical infrastructure. Since we don't live in an
> ideal world, virtual separation is generally Good Enough.
We see well under 20% doing logical separation but definitely folks
doing it... For the definition of OOB as "separate routers and
switches", we don't see anyone really sending flow over that kind
of OOB network.
> -----------------------------------
> Roland Dobbins <rdobbins@arbor.net>
Avi Freedman
CEO, Kentik
avi at kentik dot com
