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Being reported as the most general monitoring structure for out-of-band failure localization approach, the monitoring trail (m-trail) framework has been witnessed with great efficiency and promises to serve in the future Internet backbone with all-optical mesh Wavelength Division Multiplex (WDM) networks. Motivated by its potential and significance, this paper investigates failure localization in all-optical mesh networks using m-trails. By considering Shared Risk Link Groups (SRLGs) with up to all adjacent links of any node in the network, a novel algorithm of m-trail allocation for achieving Unambiguous Failure Localization (UFL) of any single SRLG failure is developed.
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