It provides an immediate view of your network traffic and is useful for troubleshooting. The Command Line Interface (CLI) is one of two NetFlow connection methods to access NetFlow data. The NetFlow cache is a database of condensed information where NetFlow data is stored once the packets have been examined. As a packet is forwarded within a router or switch, it is examined for a set of attributes, including IP source address, IP destination address, source port, destination port, Layer-3 protocol type, class of service and router or switch interface. The main components include: IP FlowĪn IP flow consists of a group of packets that contain the same IP packet attributes. NetFlow follows a simple process of data collecting, sorting and analysis. NetFlow is now part of the Internet Engineering Task Force (IETF) standardas Internet Protocol Flow Information eXport (IPFIX, which is based on NetFlow Version 9 implementation), and the protocol is widely implemented by network equipment vendors. While SNMP was effective for network monitoring and capacity planning, it didn’t provide detailed insight into bandwidth usage. Before NetFlow, network engineers and administrators used Simple Network Management Protocol (SNMP) for network traffic analysis and monitoring. The NetFlow protocol is used by IT professionals as a network traffic analyzer to determine its point of origin, destination, volume and paths on the network. The NetFlow data is then analyzed to create a picture of network traffic flow and volume - hence the name: NetFlow. NetFlow is a network protocol system created by Cisco that collects active IP network traffic as it flows in or out of an interface. Gain visibility and control What Is NetFlow?
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