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I have used MTRG to gather stats on traffic at the port level and have noticed no impact on the network. there are a number of free and pay products some for linux and windows try one and see what you think.
One other issue you will see is that you will have to set all your user ports on your switchs to run portfast. If you don't you will find that sometimes the station will get an ip number and sometimes it will not. when we set portfast on all our sw...