Decentralized Consistent Updates in SDN

Thanh Dang Nguyen, Marco Chiesa, Marco Canini

Research output: Chapter in Book/Report/Conference proceedingConference contribution

22 Scopus citations

Abstract

We present ez-Segway, a decentralized mechanism to consistently and quickly update the network state while preventing forwarding anomalies (loops and blackholes) and avoiding link congestion. In our design, the centralized SDN controller only pre-computes information needed by the switches during the update execution. This information is distributed to the switches, which use partial knowledge and direct message passing to efficiently realize the update. This separation of concerns has the key benefit of improving update performance as the communication and computation bottlenecks at the controller are removed. Our evaluations via network emulations and large-scale simulations demonstrate the efficiency of ez-Segway, which compared to a centralized approach, improves network update times by up to 45% and 57% at the median and the 99th percentile, respectively. A deployment of a system prototype in a real OpenFlow switch and an implementation in P4 demonstrate the feasibility and low overhead of implementing simple network update functionality within switches.
Original languageEnglish (US)
Title of host publicationProceedings of the Symposium on SDN Research - SOSR '17
PublisherAssociation for Computing Machinery (ACM)
Pages21-33
Number of pages13
ISBN (Print)9781450349475
DOIs
StatePublished - Apr 10 2017

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