Data analysis: BGP peer and prefix selection

Select only full-size tables from RouteViews peers
full: > 104K prefixes
filtered: 89-97K prefixes

Prefix selection:
globally routed prefixes (those common to all tables)
semiglobal (found in the majority of backbone tables) 
prefixes dropped by one (few) peers still observed 
prefixes seen only locally won't get into table
more robust than either full or global prefix set
We use only semiglobal prefixes