Together, these key fields define a unique flow. A flow is identified by the combination of the following seven field values: Both of these parameters are defined by a network-layer IP address and a transport-layer source and destination port number. This section covers the following NetFlow topics:Ī flow is a unidirectional stream of packets between a source and a destination. The device driver configures NetFlow on the device according to the parameters defined in IP Service Activator.įor information on IP Service Activator support for NetFlow by device and IOS, see the IP Service Activator Cisco cartridge guides. The NetFlow measurement parameter specifies which version of UDP to use for exporting flow data and any aggregation that should be applied before export. A range of UDP formats is supported later versions minimize bandwidth usage by aggregating data before export from the device. At intervals, the router exports its stored information in the form of NetFlow UDP datagrams to collector software the software varies, depending on which reporting tool you wish to use (see "Creating Collectors"). NetFlow is often deployed at the PE interface within an MPLS VPN but can be applied at any point in the network.įlow-based statistics are gathered on the router and stored in a cache. Often used as a metering base for other applications, including accounting and billing, network planning, and marketing, NetFlow generates flow-based statistics per interface and the information produced is highly granular. NetFlow is a Cisco-specific feature that enables you to characterize and analyze an IP flow on an interface with minimal impact on router performance.
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