This is interesting - I understand (And this is what we currently do), enabling 
ingress netflow on all "relevant" interfaces provides you with ingress+egress 
traffic data.....but if you only enable ingress+egress netflow on your Transit 
Interfaces(And not on customer subinterfacea), it does not provide this?  Can 
anyone please explain why?

Cheers.




> From: rdobb...@arbor.net
> Date: Thu, 22 May 2014 08:31:38 +0700
> To: cisco-nsp@puck.nether.net
> Subject: Re: [c-nsp] more net flow,   which interfaces to monitor and in 
> which direction?
> 
> 
> On May 22, 2014, at 8:11 AM, Charles Sprickman <sp...@bway.net> wrote:
> 
> > It seems unwise (and complicated) to add an ingress flow statement on every 
> > subinterface.
> 
> How is it unwise and complicated?
> 
> Enable it, it's done.  Simple.
> 
> >  If I could just add an “ingress” and “egress” statement to each of my two 
> > transit connections, that seems more ideal.  Is this something I should 
> > *not* do on modern hardware?
> 
> Check with Cisco - it's caused issues on other platforms in the past.
> 
> But I don't understand your rationale for not wanting visibility into all 
> your traffic passing through the routers in question.  You don't want 
> traceback for outbound/crossbound traffic emanating from your subscribers?
> 
> ----------------------------------------------------------------------
> Roland Dobbins <rdobb...@arbor.net> // <http://www.arbornetworks.com>
> 
>                    Equo ne credite, Teucri.
> 
>                         -- Laocoön
> 
> 
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