Can't find the server

Although it was over 18 months ago, it seems just like yesterday that a small Czech provider, SuproNet, caused global Internet mayhem by making a perfectly valid (but extremely long) routing announcement. Since Internet routing is trust-based, within seconds every router in the world saw this announcement and tried to pass it on. Unfortunately, due to the size of this single message, quite a few routers choked—resulting in widespread Internet instability. Today, over a year later, we were treated to a somewhat different version of the exact same story.

Fast forward to today: Friday, 27 August 2010. What do you think would happen if another large and unusual routing announcement was made on the Internet? Do you think all the router vendors have perfected their code in the past 18 months? Do you think the entire planet has upgraded to this new, improved and perfect code base? Do you think it makes sense to use the Internet as your testbed? I doubt you answered "yes" to any of these questions.

while standards compliance is nice, it is foolhardy to assume that all BGP implementations are perfectly compliant, especially given recent history. Over 3,500 prefixes (announced blocks of IP addresses) became unstable at the exact moment this "experiment" started. Not surprisingly, they were located all over the world: 832 in the US, 336 in Russia, 277 in Argentina, 256 in Romania and so forth. We saw over 60 countries impacted by a "correct" announcement that "complied with all standards". The following graph shows the timeline of the event, followed by a map of the impacted countries by prefix count. Notice that it takes a bit for the Internet to stabilize after RIPE claims to have withdrawn the announcement at 09:08 UTC.