Two other options. You could connect the SPAN port to an nProbe device which would convert the packet info to flows. More reading here
Another alternative is to use a commercial product we develop called LANGuardian which connects directly to a SPAN port and the flow\user\application we gather can be displayed within your SolarWinds views like this, the elements in the first row are all using data gathered via a SPAN port by LANGuardian
Hope this helps
@ darragh.delaney...Thank you for responding and for providing the alternatives. Are you then saying there is NO solution to this problem WITHOUT investing and integrating a third party software?
Nprobe is free but you need to invest time. You don't really integrate it, you use it to convert the SPAN traffic to flow. I was never a huge fan of RSPAN because you are potentially sending high volumes of unprocessed packets across a LAN link. Better to deal with the SPAN traffic as close as possible to where it is generated.
Our own tool requires an investment but gives a hybrid approach. Flow and some of the packet payload information.