NFO is a processing engine for network flow data (NetFlow, IPFIX, J-Flow, sFlow, etc.). It accepts network flow data from network devices (routers, switches, firewalls) and from virtual switches, such as VDS or VSS. V2P Network Visibility Module correlates virtual overlay flows with physical network flows, determines the health of the network, and pinpoints physical network devices and interfaces with the greatest impact on VMs and application performance.