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The high volume of packets and packet rates of traffic on some router linksmakes it exceedingly difficult for routers to examine every packet in order tokeep detailed statistics about the traffic which is traversing the router.Sampling is commonly applied on routers in order to limit the load incurred bythe collection of information that the router has to undertake when evaluatingflow information for monitoring purposes. The sampling process in nearly allcases is a deterministic process of choosing 1 in every N packets on aper-interface basis, and then forming the flow statistics based on thecollected sampled statistics. Even though this sampling may not be significantfor some statistics, such as packet rate, others can be severely distorted.However, it is important to consider the sampling techniques and their relativeaccuracy when applied to different traffic patterns. The main disadvantage ofsampling is the loss of accuracy in the collected trace when compared to theoriginal traffic stream. To date there has not been a detailed analysis of theimpact of sampling at a router in various traffic profiles and flow criteria.In this paper, we assess the performance of the sampling process as used inNetFlow in detail, and we discuss some techniques for the compensation of lossof monitoring detail.

Revisiting the Issues On Netflow Sample and Export Performance