Interface speed reports way off

Interface speed reports way off

I'm currently evaluating Netflow analyzer pro 6..

We're using sFlow to sample packet data from a Foundry Bigiron 4000 Jetcore, and it's sampling quite nicely, but reported speeds and utilization are not even close to what it's supposed to be.

On one gigabit interface it's reporting 24.54 Mbps IN and 11.68 Mbps OUT, while the real usage is 316Mbit IN and 41Mbit OUT

And on a 100Mbit interface it's reporting 1.16 Mbps IN and 382.39 Kbps out, while real speeds are closer to 4Mbit in and 1.5Mbit out

It's behaving like this for all active interfaces, usage speed is far lower then the actual speed.

Also in the 'Autonomous System View' it's not even close to reporting the actual throughput to other AS's

Any idea what might cause this ?











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