Anything going layer 3, you should be able to get netflow info for so it's worth a look. You could also monitor the activity of all of the switchports with NPM if you think it is related to high utilization. Netpath might give you some results as well.
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If your switches don't have NetFlow features or if you don't see the traffic going via L3 routers you may be able to use a SPAN or mirror port off the switches. So long as they are managed you should be able to set one up. If you are not sure just let me know what type of switches you use and I will see if I have the configuration guide for them. Typically you would setup the SPAN\Mirror port on the core switch and mirror the Internet gateway, router connections and important servers.
Once you have the SPAN\Mirror port setup you need access to a network traffic analyzer. SolarWinds have a Quality of Experience feature built into NPM or you could try a third party tool like our own LANGuardian which can then integrate with your SolarWinds tools. More in this video to give you an idea as to what can be done, just an Internet monitoring example but it can cover LAN, WAN and Internet traffic.
Hope this helps,
Thank you both for your answers. I think I need to clarify my question. Long story short: We can't modify the switch settings to enable or disable anything.
Will an Orion agent installed on a PC send information collected on all that PC's traffic to the Solarwinds NPM or NTA components?
The Orion Agent will only allow you to report on bandwidth utilisation of the interface. You could install nProbe software (www.ntop.org/products/netflow/nprobe) on the PC / Server to generate NetFlow data to send to the NTA module?