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Detecting Network Soft-failures with the Network Link Outlier Factor (NLOF)
In this paper, we describe and experimentally evaluate the performance of our
Network Link Outlier Factor (NLOF) for detecting soft-failures in communication
networks. The NLOF is computed using the throughput values derived from NetFlow
records. The flow throughput values are clustered in two stages, outlier values
are determined within each cluster, and the flow outliers are used to compute
the outlier factor or score for each network link. When sampling NetFlow
records across the full span of a network, NLOF enables the detection of
soft-failures across the span of the network; large NLOF scores correlate well
with links experiencing failure