![]() The FNF design gives the following levels benefits:įlexibility to choose the definition of a flow (the key and nonkey fields)įlexibility to selectively apply different flow definitions to different interfacesįlexibility to choose the exporter interfaceĮxtensibility to future improvements, such as IPFIX ![]() The NetFlow version is template based, so users can specify what data has to be exported. Flexible NetFlow provides support for IPv6 as well as L2 NetFlow records. Flexible NetFlow (FNF) is standardized on Version 9 NetFlow and gives users more flexibility on defining flows and the exported fields for each flow type. The user can select a few other fields, but NetFlow Version 5 has limitations on the details it can provide. By default, a flow is defined by seven unique keys: With traditional NetFlow, all the keys and fields exported are fixed and it supports only IPv4 flows. NetFlow assists with validating traffic engineering or policy enforcement at any point in the topology.Ĭisco NX-OS supports both traditional NetFlow (Version 5) and Flexible NetFlow (Version 9) export formats, but using flexible NetFlow is recommended on Nexus platforms. In addition to traffic rate, NetFlow provides QoS markings, TCP flags, and so on for specific applications, services, and traffic flows at each point in the network. NetFlow does not require engineering the network around the instrumentation it follows the traffic through the network over its natural path. Network traffic is often asymmetrical, even on small networks, whereas probes typically require engineered symmetry. NetFlow provides operators with network and security monitoring, network planning, traffic analysis, and IP accounting capabilities. NetFlow is a Cisco feature that provides the capability to collect statistics and information on IP traffic as it enters or exits an interface.
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