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Survivability issues in IP-MPLS networks

Molisz W.

Systems Science

2005

Vol. 31, no 2

97-105

A model for survivability assessment of IP-MPLS networks implemented directly in optical transport networks OTN (WDM) is described under assumptions as follows: end-to-end path protection; preplanned node-disjoint, dedicated or shared, backup path for each working path; distributed control of all top-down restoration actions; LSP-to-lightpath mapping minimizing the number of wavelength converters. Survivability of such networks has a fundamental importance, since a single link cut can affect extremely large traffic volumes. The optimization problem of survivable routing and wavelength assignment (SRWA) can be decomposed into a survivable routing followed by a wavelength assignment optimization problem. They are stated as the mixed integer and integer programming problems, respectively. Unfortunately, they both are NP-complete. Heuristic algorithms are proposed to solve the problems. The presented approach has been verified by means of simulation. Some results of the large number of simulation experiments investigating networks: DARPA, and NSF are described and discussed. Conclusions help in better understanding of survivability issues in IP-MPLS networks. All results are the original contribution and are published for the first time.