Statistics of NBAR and Interface input bytes

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Oct 16th, 2008
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I have a web server behind a Cisco router and my target is to gather the information of traffic loading, so I use MRTG to keep track the loading of physical interface and NBAR, but the value of max input/output counters of the interface is always smaller than that of NBAR, for example, the value of HTTP protocol is 300kb/s, but the value of the physical interface is 250kb/s, it seems have problem because the value of the interface should be larger than any protocol, is that correct?

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