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Protection Switching Methods for Point-to-Multipoint Connections in Packet Transport Networks

  • Kim, Dae-Ub (Communications & Internet Research Laboratory, ETRI, Department of Information and Communications Engineering, Chungnam National University) ;
  • Ryoo, Jeong-dong (Communications & Internet Research Laboratory, ETRI, Department of Engineering, Korea University of Science and Technology) ;
  • Lee, Jong Hyun (Communications & Internet Research Laboratory, ETRI) ;
  • Kim, Byung Chul (Department of Information and Communications Engineering, Chungnam National University) ;
  • Lee, Jae Yong (Department of Information and Communications Engineering, Chungnam National University)
  • Received : 2015.02.06
  • Accepted : 2015.10.21
  • Published : 2016.02.01

Abstract

In this paper, we discuss the issues of providing protection for point-to-multipoint connections in both Ethernet and MPLS-TP-based packet transport networks. We introduce two types of per-leaf protection-linear and ring. Neither of the two types requires that modifications to existing standards be made. Their performances can be improved by a collective signal fail mechanism proposed in this paper. In addition, two schemes - tree protection and hybrid protection - are newly proposed to reduce the service recovery time when a single failure leads to multiple signal fail events, which in turn places a significant amount of processing burden upon a root node. The behavior of the tree protection protocol is designed with minimal modifications to existing standards. The hybrid protection scheme is devised to maximize the benefits of per-leaf protection and tree protection. To observe how well each scheme achieves an efficient traffic recovery, we evaluate their performances using a test bed as well as computer simulation based on the formulae found in this paper.

Acknowledgement

Grant : Terabit optical-circuit-packet converged switching system technology development for the next-generation optical transport network

Supported by : IITP

References

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