BGP prefix announcements/withdrawals Nov 2001 RouteViews 2711 files (no cutoff for #announcements per file) total packets: 30M packets with announcements 28.2M packets with withdrawals 1,955,188 packets with both 127,429 total announcements 83.5M total withdrawals 11.7M average announcements/packet 2.7736 average withdrawals/packet 0.3874 average withdrawals/wd.packet 5.9615 15X as many announcement as withdraws 15X as many withdraws as ann.&withdraw withdrawals packed at prefixes/AS path ratio of ~6.5