Download Network Monitoring in High Speed Networks by Baek-Young Choi PDF

By Baek-Young Choi

Community tracking serves because the foundation for a large scope of community, engineering and administration operations. detailed community tracking contains analyzing each packet traversing in a community. despite the fact that, this isn't possible with destiny high-speed networks, because of major overheads of processing, storing, and shifting measured information. community tracking in excessive velocity Networks offers actual size schemes from either site visitors and function views, and introduces adaptive sampling recommendations for varied granularities of site visitors dimension. The strategies permit tracking structures to manage the accuracy of estimations, and adapt sampling chance dynamically in line with site visitors stipulations. the problems surrounding community delays for useful functionality tracking are mentioned within the moment a part of this publication. Case reports in line with actual operational community strains are supplied all through this booklet. community tracking in excessive pace Networks is designed as a secondary textual content or reference booklet for advanced-level scholars and researchers focusing on machine technological know-how and electric engineering. pros operating in the networking also will locate this publication invaluable.

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The detection statistics corresponding to M = 30, 50, 80 are shown, respectively, in the second, third, and fourth plot. We see that using smaller M detects load changes that occur in a smaller time scale. , a duration of about 3000sec) before and after the time index 100; a load change of a much larger time scale and magnitude occurs around the time index 150, and a few other load changes of a smaller time scale occur afterwards. A larger M ignores load changes that occur at the smaller time scale and with a smaller magnitude that are otherwise detected by a smaller M.

The above results suggest that we can approximate both the estimation error and prediction error using normal distributions with zero mean. This allows us to quantify the variance of the errors introduced by the adaptive random sampling process. For example, assume, for simplicity, that an AR(1) model is used for predicting Sk , the SCV of the packet sizes of the kth block. Then the variance of the prediction error, var(esk ), is given by var(esk ) = σS2s (1 − as1 ρSsk ,1 ), where ρSsk ,1 is the lag-1 k s )+ autocorrelation of Sks .

Monitored traffic load will be used for time-series analysis such as detecting 1 Abilene is an advanced backbone network that connects regional network aggregation points, to support the work of Internet2 universities as they develop advanced Internet applications [1]. 14 2 Load Characterization and Measurement abrupt changes in traffic loads. We then derive a lower bound on the number of samples needed to estimate the traffic load accurately within a given tolerance level. Based on this, we determine the sampling probability that is optimal in the sense that it guarantees the given accuracy with the minimum number of samples.

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