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Is there any way to proactively act upon netflow information?

Netflow is very useful in providing info on bandwidth usage between pair of devices. From what i know one can take reactive action by blocking certain traffic (if utilization starts affecting production traffic say on WAN link) once the information is collected by netflow. What i want to find out is, if there is any way, to set a threshold of bandwidth usage for top talkers and if the usage is above that threshold then kill the flow using say access-list on a wan interface or by shutting down the access-port on lan side.

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