Mobility

DevoFlow: Cost-Effective Flow Management for High Performance Enterprise Networks

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Executive Summary

The OpenFlow framework enables flow-level control over Ethernet switching, as well as centralized visibility of the flows in the network. OpenFlow's coupling of these features comes with costs, however: the distributed-system costs of involving the OpenFlow controller on flow setups, and the switch-implementation costs of involving the switch's control plane too often. In this paper, the authors analyze the overheads, and they propose DevoFlow, a modification of the OpenFlow model in which they try to gently break the coupling between centralized control and centralized visibility, in a way that maintains a useful amount of visibility without imposing unnecessary costs.

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