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ReversePTP: A clock synchronization scheme for software‐defined networks

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  • Tal Mizrahi
  • Yoram Moses

Abstract

We introduce REVERSEPTP, a clock synchronization scheme for software‐defined networks (SDNs). REVERSEPTP is based on the Precision Time Protocol (PTP), but is conceptually reversed; in REVERSEPTP, all nodes (switches) in the network distribute timing information to a single software‐based central node (the SDN controller), which tracks the state of all the clocks in the network. Hence, all computations and bookkeeping are performed by the central node, whereas the ‘dumb’ switches are only required to periodically send it their current time. In accordance with the SDN paradigm, the ‘brain’ is implemented in software, making REVERSEPTP flexible and programmable from an SDN programmer's perspective. We present the REVERSEPTP architecture and discuss how it can be used in typical SDN architectures. Our experimental evaluation of a network with 34 REVERSEPTP‐enabled nodes demonstrates the effectiveness and scalability of using REVERSEPTP. Copyright © 2016 John Wiley & Sons, Ltd.

Suggested Citation

  • Tal Mizrahi & Yoram Moses, 2016. "ReversePTP: A clock synchronization scheme for software‐defined networks," International Journal of Network Management, John Wiley & Sons, vol. 26(5), pages 355-372, September.
    • Handle: RePEc:wly:intnem:v:26:y:2016:i:5:p:355-372
    DOI: 10.1002/nem.1942
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