Hierarchical Clustering and Network Topology Identification层次聚类和网络拓扑结构识别.pptVIP

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Hierarchical Clustering and Network Topology Identification层次聚类和网络拓扑结构识别.ppt

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11/11/2004 Copyright ? 2004 - Rui Castro * Hierarchical Clustering and Network Topology Identification Mark Coates Rob Nowak Department of Electrical and Computer Engineering Rui Castro Copyright ? 2004 - Rui Castro Topology Identification Pairwise delay measurements reveal topology Ratnasamy McCanne (1999) Duffield, et al (2000,01,02) Bestravos, et al (2001) Coates, et al (2001) Shih Hero (2002) Copyright ? 2004 - Rui Castro Topology Identification Challenges: 12 % never respond,15 % multiple interfaces - Barford et al (2000) detect level-2 topology “invisible” to IP layer (e.g., switches) Copyright ? 2004 - Rui Castro Relationship between Topology ID and Hierarchical Clustering Copyright ? 2004 - Rui Castro Do not need clock synchronization!! Sandwich Probing Copyright ? 2004 - Rui Castro more shared queues ? larger Topology imposes constraints we can infer that receivers 3 4 have a longer shared path than 3 5 Sandwich Probing Copyright ? 2004 - Rui Castro Delay Covariance more shared queues ? larger covariance Copyright ? 2004 - Rui Castro individual measurement Multiple measurements CLT Measurement Framework Key Assumptions: stationarity fixed (but unknown) routes temporal independence spatial independence Copyright ? 2004 - Rui Castro The maximum likelihood tree (MLT) is defined as where Maximum Likelihood Tree - MLT Two Approaches: Binary tree construction based on bottom-up, recursive selection and pair-merging process Markov Chain Monte Carlo (MCMC) tree search measurements unknown similarity metric values, measurement likelihood forest of possible trees, monotonicity constrain set, for tree product of Gaussian densities Copyright ? 2004 - Rui Castro Traceroute topology ALT topology UNO Internet Experiments – Sandwich Probing MCMC topology Copyright ? 2004 - Rui Castro Traceroute topology Estimated topology Internet Experiments – RTT Delay Covariance Thanks to Yolanda Tsang Mehmet Yildiz Copyright ? 2004 - Rui Castr