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Researchers such as [MUF+2007]_ have shown that modeling the Internet topology at the AS-level requires more than the `shared-cost` and `customer->provider` peering relationships. However, there is no publicly available model that goes beyond these classical peering relationships.
BGP data is often collected by establishing BGP sessions between Unix hosts running a BGP daemon and BGP routers in different ASes. The Unix hosts stores all BGP messages received and regular dumps of its BGP routing table. See http://www.routeviews.org, http://www.ripe.net/ris, http://bgp.potaroo.net or http://irl.cs.ucla.edu/topology/.