Research on Local Clustering of the Internet AS Level Topology
Guoqing Zhang · Fuza xitong yu fuzaxing kexue · 2006
The Internet AS level topology,upon which BGP4 runs,plays a vital role in the analysis and study of the global routing behavior.However,the study of the topology itself is not as comprehensive and extensive as the protocol.Clustering,originating from the small-world concept,is often measured by the clustering coefficient—a macroscopic topological metric.Nevertheless,macroscopic metric cannot determine the microscopic behavior.In this paper,the inherent microscopic local clustering behavior of the Internet AS level topology is studied from several perspectives.The presence of strong local clustering in the AS graph is quantitatively verified along with the demonstration of the weakness for PFP model—which is regarded as the most accurate Internet AS level topology generator to date—to capture it.