Achieving High Utilization with Software-Driven WAN

Provided by: Association for Computing Machinery
Topic: Software
Format: PDF
The authors present SWAN, a system that boosts the utilization of inter-datacenter networks by centrally controlling when and how much traffic each service sends and frequently reconfiguring the network's data plane to match current traffic demand. But done simplistically, these reconfigurations can also cause severe, transient congestion because different switches may apply updates at different times. They develop a novel technique that leverages a small amount of scratch capacity on links to apply updates in a provably congestion-free manner, without making any assumptions about the order and timing of updates at individual switches.

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