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Maintaining netflow data can be computationally expensive for the router and burden the router's [[Central processing unit|CPU]] to the point where it runs out of capacity. To avoid problems caused by router CPU exhaustion, Cisco provides "sampled netflow". Rather than looking at every packet to maintain netflow records, the router looks at every ''n''th packet, where ''n'' can be configured. When sampled netflow is used, the netflow records must be adjusted for the effect of sampling -- traffic volumes, in particular, are now an estimate rather than the actual measured flow volume.
==See also==
* [[MRTG]]
* [[PRTG]]
==External links==
* [http://www.cisco.com/warp/public/732/Tech/nmp/netflow/index.shtml Basic Netflow information on the Cisco Site]
* [http://www.cisco.com/warp/public/732/Tech/nmp/netflow/partners/freeware/ List of Freeware Netflow Software on the Cisco Site]
* [http://www.paessler.com/prtg/ Paessler Router Traffic Grapher (Windows Freeware that supports Netflow)]
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[[Category:Internet]]
[[Category:Network management]]
[[Category:Network-related software]]
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