On May 8, 2013, at 10:54 AM, Ray Wong <rayw@rayw.net> wrote:

Doesn't seem directly correlated with outages, and everything seems to be working ok, but I'm seeing about a 20-30% shift in flows from AS7792 to AS3356. Seems unlikely that many ISPs have suddenly turned up a level3 link on the same day/hour, and performance metrics all seem normal. I confess I've had to turn my attention away from network issues to systems/DB/security ones lately, so I may have missed something. Anyone else seeing fairly significant next hop shifts over the previous 24 hours? All of yesterdays major outages I was sort of suspecting seem to have been resolved without correlating shifts back.

Just a random guess: Level3 could be migrating/integrating further networks which has triggered this shift. They do represent over 50% of the networks out there http://as-rank.caida.org/?mode0=as-ranking&n=50&ranksort=1 You can see here they have 51% of AS'es and 55% of IPv4 prefixes behind them. If you look at the combined, it's even more @69%/72% here: http://as-rank.caida.org/?mode0=org-info&mode1=member-ases&org=LVLT-ARIN - Jared