. http://www.catonetworks.com/blog/the-carrier-cloud-needs-a-new-fabric-not-a-patched-cloth/
blog article
THE CARRIER CLOUD NEEDS A NEW FABRIC, NOT A PATCHED CLOTH
SD-WANs are driven by the explosive growth of Internet traffic and the changes in traffic flows. There is less demand for MPLS-to-the-datacenter and more demand for accelerating and securing traffic to internet destinations, such as cloud infrastructure and public cloud applications.

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