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Netflow not reporting accurate traffic

Just wondering if anyone out there has experienced the same issue and could give some feedback...

We have some 7600 Devices running Dual Sup 32 Mods and some Dual Sup 720 Mods..

When we look at the interface on any device running the dual sup 32s, and see traffic on that interface to be at 20M, Netflow accurately reports the 20M.


When we look at the interface on any device running the dual sup 720s, and see traffic on that interface to be at 20M, Netflow reports traffic of 2M.

Both of these sets (32 and 720 sups) are running the same IOS

Further more, we downloaded different trial versions of other Netflow Analyzer providers, and they all report the same readings...

A case with Cisco has gotten us nowhere as of yet...

Thanks!