On Wed, Feb 21, 2001 at 02:12:30PM -0500, Chris Rapier wrote:
> > We hope to package up the Netflow portion (sans ResNet database) to run
> > under Linux. So someone could drop it on generic Linux machine, configure
> > their router to export netflow
>
> Question about the usage of netflow, aside from the lisencing fees
> doesn't enabling it on a router produce a noticable performance hit? I
> know that hit can be mitigated by sampling instead of monitoring every
> packet but how are you getting accurate data on usage that way?
> Admitedly I don't know much about netflow as we'd never bothered with
> getting a license for it.
The performance impact most likely depends on what type of router you're
running. I just read some documentation on the Cisco 6509 that claims
there's no impact. On the other hand, I've been told there's a significant
impact on GSRs. On Junipers you're limited by the 100mbps connection to
the Routing Engine.
- Matt
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