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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Impacts of Hierarchy in Ethernet Ring Networks on Service Resiliency

  • Lee, Kwang-Koog (Advanced Communications Research Laboratory, ETRI, Department of Engineering, University of Science and Technology) ;
  • Ryoo, Jeong-Dong (Advanced Communications Research Laboratory, ETRI) ;
  • Kim, Young-Lok (Department of Electronic Engineering, Sogang University)
  • Received : 2011.05.30
  • Accepted : 2011.10.19
  • Published : 2012.04.04
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Abstract

In transport networks, a multi-ring architecture is very useful to facilitate network planning and to design and provide more resilient services for customers. Unlike traditional synchronous optical network multi-rings, the service resiliency of Ethernet-based multi-rings is significantly impacted by the ring hierarchy because a link or node failure in a certain level ring triggers filtering database flush actions in all higher level rings as well as in the ring with the failure, and consequently a large amount of duplicated data frames may be flooded. In this paper, we investigate how the ring hierarchy impacts the service resiliency of multi-ring networks. Based on extensive experiments on various single- and multiple-link failures, we suggest two effective inter-ring connection rules to minimize the transient traffic and to ensure more resilient multi-ring networks. In addition, we consider a flush optimization technique called e-ADV, and show that the combination of e-ADV and multi-ring structures satisfying our inter-ring connection rules results in a more attractive survivability performance.

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