SolarWinds NetFlow Traffic Analyzer (NTA) gives you a complete view of the bandwidth usage in your network in that it provides information about how the network is being used, who is using it, and for what purpose are they using the network.
NetFlow is a Cisco proprietary protocol. However, other vendors such as HP, Juniper, and Nortel Networks have their own versions of NetFlow called J-Flow, sFlow, IPFIX, and Huawei NetStream. SolarWinds NTA can analyze data from all of these types of flow protocols. More information about NTA can be found at http://www.solarwinds.com/netflow-traffic-analyzer.aspx.