Presentations
Routing Table Sizes
As referenced in the Blackout Results in Widespread Network Outages Report
The majority of the power failures began at about 16:10 EDT. Immediately thereafter, the number of routes in global routing tables dropped rapidly, falling by nearly 1000 within five minutes. This likely corresponded to the loss of reachability of networks which did not have alternative backup power sources (or whose Internet providers didn't). Table size then continued to drop, though at a slightly more gradual pace. We suspect that losses during this time correspond to networks with limited backup power, which were able to stay online temporarily until those power supplies were exhausted. By 19:00 EDT, routing table sizes had reached their low point, a full 2500 networks fewer than the current baseline size. Any network that was to be affected by the outage was offline by that time. By midnight EDT, route totals were back on the rise again, though very slowly. They grew gradually at a constant rate until leveling off at their original sizes again around midnight Friday night.
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