If the SBG issue really triggered the outage for the whole network I find it hard to believe that no one saw that problem beforehand. They probably thought that this was too unlikely to happen or that there are other failovers but never tested them properly.
No expert on the field but that's the first time I can remember that a provider of that size loses connection to most of their data centres at once. That can happen with one product (eg S3 failure) but datacentre switches should work even if the rest is on fire.
No expert on the field but that's the first time I can remember that a provider of that size loses connection to most of their data centres at once. That can happen with one product (eg S3 failure) but datacentre switches should work even if the rest is on fire.