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Strategies for optical transport network recovery under epidemic network failures

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Abstract

The current trend in deploying automatic control plane solutions for increased flexibility in the optical transport layer leads to numerous advantages for both the operators and the customers, but also pose challenges related to the stability of the network and its ability to operate in a robust manner under different failure scenarios. This work evaluates two rerouting strategies and proposes four policies for failure handling in a connection-oriented optical transport network, under generalized multiprotocol label switching control plane. The performance of the strategies and the policies are evaluated under multiple correlated large-scale failures. We employ the Susceptible–Infected–Disabled epidemic failure spreading model and look into possible trade-offs between resiliency and resource efficiency. Via extensive simulations, we show that source rerouting outperforms on-site rerouting, and that there exist a clear trade-off between policy performance and network resource consumption, which must be addressed by network operators for improved robustness of their transport infrastructures. Applying proactive methods for avoiding areas where epidemic failures spread results in 50 % less connections requiring recovery, which translates in improved quality of service to customers and lower recovery expenses for the network operator.

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Notes

  1. In this work, the node’s planes are considered logically separated, but physically colocated.

  2. Since as a recovery mechanism we use restoration, the terms recovery and restoration are used interchangeably in this work.

  3. Unlike scenario 1, where the performance is evaluated under varying severity of the epidemic failure spreading process.

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Authors and Affiliations

  1. DTU Fotonik, Technical University of Denmark, Kongens Lyngby, Denmark

    Sarah Ruepp, Anna Manolova Fagertun & Vasileios Kosteas

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  1. Sarah Ruepp
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  2. Anna Manolova Fagertun
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  3. Vasileios Kosteas
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Correspondence to Sarah Ruepp.

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Ruepp, S., Fagertun, A.M. & Kosteas, V. Strategies for optical transport network recovery under epidemic network failures. Photon Netw Commun 29, 330–341 (2015). https://doi.org/10.1007/s11107-015-0502-6

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