What is the maximum bandwidth utilization (in percentage) in order not to reach congestion? Starting from which...
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percentage of used bandwidth do we consider that the bandwidth is not sufficient anymore? A good answer to this question starts with a definition of "utilization," For starts, consult an answer to a similar question asked some time ago: http://searchnetworking.techtarget.com/ateQuestionNResponse/0,289625,sid7_cid528562_tax293255,00.html and http://searchnetworking.techtarget.com/ateQuestionNResponse/0,289625,sid7_cid514600_tax293255,00.html
Finally I would suggest a look at my white paper on traffic just to get another perspective on the nature of congestion and its sources. http://searchnetworking.techtarget.com/whitepaper/1,289194,sid7_gci903796,00.html
All that said, and without getting any clearer about the nature of how you actually measure utilization, some typical numbers (extracted from another reader's question) could be
<38% = stable
38-42% = borderline
42-47% = concern
>47% = definite upgrade
Knowing where most people get those number (MRTG for example), this scale is appropriate for typical networks. That said, this is a very broad rule-of-thumb and your mileage will certainly vary.
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