routing myths: routing behavior (continued)

myth:
small ISPs & multihoming cause growth and/or churn
data: 
since 1998, the share of /24s has stayed between 57% and 58.5%
number of non-transit multihomed ASes grew from 35% to 37% in 2000-2001, but their share of global routes remained stable at around 30%.
new address announcements & deaggregation of existing prefixes were major sources of new prefixes between nov00-may01
most routing instability (w/drawal/reannounce events) in late 2001 contributed by a few .gov networks, developing country telecoms, & major backbone ISPs. although backbone providers routes are relatively stable on per-prefix basis.
instability caused in part by deaggregated routes leaking out originating AS, and by relatively short-lived transient announcements.  (`small multihomers' contribute negligibly, at least on bi-hourly scale)