Is it a single port you want to distinguish between up and download?
Then you can use the filter options in prtg one sflow sensor for interface inbound and one for interface outbound...
Not sure if it is the same for aruba, but manageengine netflow analyzer was a great tool. I worked with it a couple of years ago, and it was much better then the build in sflow/netflow in prtg or solarwinds. But today it looks like it is not a standalone tool, only embedded in the OPmanager/OPutils Kit. And it is not cheap... But take a look for yourself.
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