I intentionally created a load for about 2 ~ 3 minutes, with active flow timeout set as 1 minute on Cisco router, to confirm what I will see on NetfFlow Analyzer.

 

I expect the graph shows me trapezia shaped spike, but what I got was a pretty trianlge spike across that 2 minutes.

 

As shown in the attached JPG, all load instances appeared as triangle spike across 2 minutes...

 

Any idea what might causing this issue?

 

I try to create this test, the overall graph shown looks quite different to MRTG.

 

Regards

CS Kwok