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Assuming per interface, it depends on what specifics you are looking for. If I have a 100meg link I don't usually like to know only how much data *right now* is filling up that interface. I want to know %used, Bytes/sec, and packets/sec, and I want to know both directions and averages.
So for bandwidth I use a custom tab at the interface level with:
Average bits per sec(step)
Min/max/average bps in/out
Average packets per sec
Total bytes transferred
Total packets transferred
All that because a full pipe *to me* is never just full, because I am the one who has to fix it or diagnose it or otherwise address the issue. However if I am serving up a view for a manager or supervisor that requires bandwidth I usually use the "Percent Utilization(step)" and I add the trend.
Sorry that's kind of a long answer, its just I've never found it just as simple as "how much bandwidth am i using". Everyone has their own methods and reasons for them.
thanks this helps out a lot i will put all this together and try to get these guys to tell me exactly what they want.