forward IP topology vs BGP RouteViews data


basically a ton of decimation on a day of skitter data
skitter AS graph: 6949 AS nodes, 16145 AS links (peering sessions)
remove any potential advantage of skitter probing
frequency
finer (IP) granularity 
nonetheless, skitter captures much larger share of the Internet's bidirectional connectivity. 
skitter combinatorial core (full-transit portion) contains 988 AS nodes, 
      as opposed to BGP's 299 nodes (3.3X more)