[rtg] Fwd: Results with RTG

[John Von Essen]

True, but any sizable operation (of which most people who use RTG  
are) will have to do sampling. There's no way you can afford to burn  
all those cpu cycles and not sample.

I haven't seen any real world stats on the super high-end Cisco gear,  
but I know from experience Sup2 and Sup32 on 6500/7600 really start  
to break down once you hit like a few hundred Mbps. The Netflow  
memory cache gets reached, and you have to start sampling.



On Mar 9, 2009, at 4:07 PM, Matt Simerson wrote:

>
> On Mar 9, 2009, at 12:52 PM, John Von Essen wrote:
>
>> With Netflow, you are "interpolating" the rates off those sampling  
>> points.
>
> NetFlow is a network protocol, of which there are various  
> implementations.  What you are describing is Sampled Netflow and  
> would not be suitable for billing. But that is not the only way.
>
> http://en.wikipedia.org/wiki/Netflow
>
> Matt
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