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Monitoring trail (m-trail) has been proposed as an effective approach for link failure localization in all-optical WDM (Wavelength Division Multiplexing) mesh networks. Previous studies in failure localization rely on alarm dissemination via control plane signaling such that the network controller can collect the flooded alarms to form an alarm code for failure identification. Such cross-layer signaling effort obviously leads to additional control complexity. The paper investigates a novel m-trail failure localization scenario, called Network-Wide Local Unambiguous Failure Localization (NWL-UFL), where each node can perform UFL based on locally available on-off state of traversing m-trails, such that alarm dissemination in the control plane can be completely avoided.
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