NetFlow is an industry standard for network traffic monitoring. Although originally developed by Cisco, it has since become an industry standard. Once enabled, it can be used to capture IP traffic statistics on all the interfaces where NetFlow is enabled, and send them as records to the NetFlow collector software. Starting with vSphere Distributed Switch 5.0, we can enable NetFlow at the VDS or dvPortGroup level. From vSphere 5.1 onwards, VMware supports NetFlow version 10 (IPFIX).
The following procedure explains how to enable NetFlow on a VDS: