Relationship between MSTP device unreachability and service interruption

Relationship between MSTP device unreachability and service interruption:
SDH service and monitoring channels are distributed in different positions of an STM-N frame. By default, the regenerator section overhead bytes D1–D3 are used as the monitoring channel, and the payload area of the STM-N frame is used as the SDH service channel. Modules on each board can independently process the bytes and payloads. In normal cases, services will not be interrupted due to device unreachability(a monitoring channel fault). Device unreachability indicates that the monitoring signals cannot be transmitted or received from the NMS to an NE. For example, DCC bytes fail to be transmitted or received.
The possible cause is that the system control board may be faulty. A service interruption indicates that service signals are unreachable at the source and sink ends. If a device becomes unreachable and a service is interrupted, the following faults may occur: power outrage, board faults, or link faults. You can determine the possible cause based on alarms reported on upstream NEs.

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