Facebook's recent "DNS problem" was a process for checking routing failover capacity on the backbone for maintenance ended up taking down the backbone links. As a result of the servers being disconnected from the backbone they pulled their BGP advertisements since they considered their location to be unhealthy (no connection to the backbone).
FB's problem was the lack of routing reachability on its backbone triggering the lack of routing reachability information being sent to the larger internet, this in turn caused problems for DNS not the other way around.
FB's problem was the lack of routing reachability on its backbone triggering the lack of routing reachability information being sent to the larger internet, this in turn caused problems for DNS not the other way around.
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