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It is typical for cloud providers to operate a number of geographically distributed datacenters, where inter-datacenter traffic constitutes a large portion of a cloud provider's traffic demand over the Internet. Though such inter-datacenter traffic incurs substantial operational costs that are charged by ISPs, it varies significantly across different overlay links, raising the opportunity to optimize both routing and scheduling of inter-datacenter traffic to minimize costs. As data is being transmitted multiple sources to their respective destinations, an intermediate datacenter is also able to store data and forward them at a later time, so that peak traffic demand can be reduced.
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