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How to extract BGP peering information from the internet routing registry

We describe an on-line service, and its underlying methodology, designed to extract BGP peerings from the Internet Routing Registry. Both the method and the service are based on: a consistency manager for integrating information across different registries, an RPSL analyzer that extracts peering specifications from RPSL objects, and a peering classifier that aims at understanding to what extent such peering specifications actually contribute to fully determine a peering. A peering graph is built with different levels of confidence. We compare the effectiveness of our method with the state of the art. The comparison puts in evidence the quality of the proposed method.