Google unveiled to the outside world its peering edge architecture — Espresso. At the Open Networking Summit (ONS), Google Fellow Amin Vahdat said Espresso is the fourth pillar of Google’s software-defined networking (SDN) strategy. Its purpose is to bring SDN to the public Internet.
Espresso, which has been in production for over two years, already routes 20 percent of Google’s total traffic to the Internet. Previously, Google ran protocols on high-end routers and peered with its partners. But Vahdat said those routing protocols had a very local view with the goal of simply finding a path between source and destination. The goal was not to find the best path or to dynamically shift paths.
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