Placing BGP Monitors in the Internet ∗

BGP Monitoring projects such as RouteViews and RIPE RIS provide valuable data for networking research. Prior efforts, such as understanding BGP dynamics, have mined the BGP data collected by RouteViews and RIPE to make general inferences about the Internet routing. Ideally one would like to have the collected BGP data covering the entire Internet. However various operational constrains limit the number of monitors to be used for the data collection, and up to this point, the selection of monitors has been based on intuitive judgment among available candidates. In this paper we use link coverage, defined as the set of links observed by all the monitors, as the monitor selection criterion and evaluate the current monitor selection by RouteViews project. We show that a simple greedy strategy can achieve much better link coverage than that achieved by the same number of monitors selected by RouteViews. Our results also show that edge nodes of the Internet provide more link coverage than the tier1 nodes in general.

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