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Netflow is a Cisco IOS software feature and also the name of an open (but proprietary) Cisco protocol for collecting IP traffic information. Cisco routers with netflow enabled generate netflow records, which are exported from the router in UDP packets and collected using a netflow collector. Juniper Networks provides a similar feature for its routers called cflow.
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Maintaing netflow data can be computationally expensive for the router and burden the router's 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 that 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.
[[Category:Internet]]
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