Assertion: new express backbone | /r/CapableOf | distribute central controller
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text: The neat thing about Express Backbone is that it has distributed control agents and a central controller, which allows Facebook to exercise top-down traffic shaping across the WAN while at the same time allowing a certain amount of intelligence in the Express Backbone’s distributed control plane to allow for parts of the network that have congestion to deal with it as it is happening, where it is happening.