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Two GMPLS restoration strategies operating at wavelength and link granularities are experimentally validated in a multi-domain WSON. The strategies are qualitatively compared in terms of resource usage, restorability and restoration time. In Wavelength Switched Optical Networks (WSON), a link or node failure causes a huge amount of data loss. Fast and efficient recovery schemes are needed to minimize these effects and recover the disrupted services. This paper concentrates on restoration schemes where the backup path is computed and set up after the failure is detected, localized and notified to the responsible node to recover the failed lightpath.
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