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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.
Shared protection, Multi-Protocol Label Switching (MPLS), Singular value decomposition (SVD), Stale link-state, Min-Plus algebra

P. Ho, J. Tapolcai and A. Haque, "TROP: A Novel Approximate Link-State Dissemination Framework For Dynamic Survivable Routing in MPLS Networks," in IEEE Transactions on Parallel & Distributed Systems, vol. 19, no. , pp. 311-322, 2007.
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