A new protection algorithm with consideration of lightpath load in fault-tolerant GMPLS optical networks

Lei Guo, Jiannong Cao, Xingwei Wang, Cunqian Yu, Weigang Hou

Research output: Journal article publicationJournal articleAcademic researchpeer-review


In this paper, we study the survivability in GMPLS optical networks and propose a new algorithm called Protection based on Lightpath Load (PLL) to tolerate the single-fiber link failure. Based on the parameter, Boundary of Heavy-load Lightpath (BHL), PLL can effectively choose the protection execution whether on optical layer or on IP/MPLS layer, such that the bandwidth utilization and recovery complexity can be compromised. In PLL, if the number of Working Label Switching Path (WLSPs) carried on a Working Lightpath (WLP) exceeds the value of BHL, this WLP will be protected in optical layer; otherwise, these WLSPs carried on this WLP will be protected on IP/MPLS layer. Simulation results show that, compared to conventional protection algorithm, PLL not only can significantly reduce the recovery complexity but also can obtain satisfactory trade-off performance.
Original languageEnglish
Pages (from-to)1919-1924
Number of pages6
Issue number21
Publication statusPublished - 1 Nov 2010


  • Heavy-load lightpath
  • Optical networks
  • Protection
  • Survivability

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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