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Comparing Netflow traffic chart to NPM

Hi,

I have been trying to compare the results of NTA 3.6 top transmitter chart (15 min) and the NPM v10 min/max/avg bps transmitted chart. Both the applications are on the same server and the result attached is for the same router interface (router connected to 16mbps Internet leased line).

I want to understand why NTA reported a peak rate of approxiamtely 8.5mbps @ 9:32 and 9:35 (see nfv9.jpg) whilst NPM (on the same server) reported a comparable single peak of 8mbps but sometime around 6:30 (see swchart.jpg). Is it something to do with NPM statistics settings? because I havent changed anything there.

Also when I select NTA chart but for 4 hours (attached image nfv9 4hours.jpg) I do not find any peak rate of 8.5mbps that was displayed by the 15 min chart. The max peak rate I see is approx. 5.5mbps at 7:00. I want to understand how the information is displayed or averaged out.

All Help is appreciated

Thanks

images.zip

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quantus

I'm not sure if this will answer your questions, but here's some things I found helpful in trying to understand these types of things

-Default time before NTA starts compressing/averaging data is 180 minutes, so if it's been more than three hours you're going to start to see peaks drop some as they're averaged.

-Netflow doesn't show up until the transfer is completed. This is not true of the Min/Max/Average.

-In general, the Min/Max/Average charts are much more useful for determining exact bandwidth usage at a specific moment. Netflow charts tend to be smoother and off a bit in time - what they can do is show you what type of traffic is happening.

tacobell555

Thanks for the reply.

I certainly feel that Netflow results are slower to report Bandwidth. I find the realtime min\max\avg gauge and historical chart to be more accurate than both the NPM Network Performance Monitor and Netflow.

But is it OK to reduce the statistic collection time for NPM Perfmon from the default 9 min to 3 or lower in order to get a closer result similar to the realtime gauge chart?

Thanks Again

wrodenbusch

tacobell555, are you talking about the Default Interface Statistics Poll Interval? If so, you can reduce this to 3 minutes. It may increase the load on your Orion but you can always set it back if need be.

tacobell555

Thanks for the feedback, i will drop it down to 3 min and see the results

Thanks again