Prefix set churn


Churn (emergence and disappearance of prefixes
in the table) was much higher than growth rate.
highest for more specifics
lowest for standalone blocks
net change in table size sometimes < 0

semiglobal prefixes in following data uses 
all available RouteViews backbone tables, 
including filtered tables, for 3 sample points: 
May 3, August 1, and November 1, 2001 
(33, 42, and 39 tables, respectively)