Need to add something. I need the report to not total the monthly sums. I tried using the default report NPM, cisco devices bandwidth uitlization last month and then adjusted the timeframe to the last 6 months. this caused me to get a running total of bandwidth used vs. breaking out the amount used each month.
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You should be able to do what you want with the default reports.
But you have to make sure you have your database retention times set so that it will retain the granularity that you require. This is done by clicking on Settings and then Polling Settings. Scroll down to Database Settings and configure the details as you need.
And in the reports itself, you can do summarization either by Hour, Date, Month etc. If you select hour, it will rollup the statistics into hourly sums. This is found on the Summarization Tab.
Hope that helps.