TROP: A novel approximate link-state dissemination framework for dynamic survivable routing in MPLS networks

János Tapolcai, Pin Han Ho, Anwar Haque

Research output: Contribution to journalArticle

7 Citations (Scopus)


In this paper, a novel approximate link-state dissemination framework, called TROP, is proposed for shared backup path protection (SBPP) in Multi-Protocol Label Switching (MPLS) networks. While performing dynamic explicit survivable routing in a distributed environment, link-state dissemination may cause non-trivial signaling overhead in the process of exploring spare resource sharing among individual backup Label Switched Paths (LSPs). Several previously reported studies have tackled this problem by initiating a compromise between the amount of dissemination and the achievable extent of resource sharing. The paper first summarizes the previously reported schemes into a compact and general link-state dissemination framework by way of singular value decomposition (SVD). To improve the accuracy of the matrix reconstruction and to eliminate overestimation of the sharable spare capacity along each link, a novel SVD approach based on Min-Plus algebra (or called Tropical Semi-Rings) is introduced. Simulation results show that the proposed schemes can achieve a lower blocking probability than that by all the other counterpart schemes while taking the same complexity of link-state dissemination. This great advantage is gained at the expense of longer computation time for solving a linear program (LP) in each dissemination cycle at the core nodes. We also consider the stale link-state phenomena that may cause imprecision in the routing information at the ingress nodes due to the delay in the periodic/ event-driven link-state update message advertisement.

Original languageEnglish
Pages (from-to)311-322
Number of pages12
JournalIEEE Transactions on Parallel and Distributed Systems
Issue number3
Publication statusPublished - Mar 1 2008


  • Min-Plus algebra
  • Multi-Protocol Label Switching (MPLS)
  • Shared protection
  • Singular value decomposition (SVD)
  • State link-state

ASJC Scopus subject areas

  • Signal Processing
  • Hardware and Architecture
  • Computational Theory and Mathematics

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