Whether diamond services can be switched if D4 to D12 bytes are unavailable on an MSTP device

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Whether diamond services can be switched if D4 to D12 bytes are unavailable on an MSTP device:
If D4 to D12 bytes are unavailable, diamond services can be switched normally but cannot be rerouted.

Other related questions:
Whether a service is provisioned on an MSTP device
Whether a service is provisioned on an MSTP device: 1. Search and view related service trails to check whether the service trails are complete and activated. 2. Check whether abnormal alarms are reported for the service board. 3. Test the customer services.

Whether extra services can be restored by stopping the protocol after the MSP switching on an MSTP device
Whether extra services can be restored by stopping the protocol after the MSP switching on an MSTP device: Services on the faulty working channel will be interrupted by stopping the protocol after the MSP switching. Then, the extra services on the protection channel will be restored. During this process, you need to pay attention to the severities of services on the working channel and extra services on the protection channel.

Rerouting policies of diamond services
The rerouting policies for diamond services are described as follows: Permanent 1+1 protection: Rerouting is triggered when either the working or protection LSP is interrupted. Rerouting 1+1 protection: Rerouting is triggered only when both the working and protection LSPs are interrupted. Flex P&R: In this rerouting policy, P indicates the number of protection times. R indicates the number of rerouting times. Before P is used up, rerouting is triggered when either the working or protection trail becomes faulty. After P is used up, rerouting is triggered only when both the working and protection LSPs become faulty. After R is used up, rerouting is stopped. Non-rerouting 1+1 protection. No rerouting is triggered upon interruption of LSPs regardless of the working or protection LSP. On the NMS, the configuration of electrical-layer ASON services depends on the rerouting policies. On the page for creating electrical-layer diamond services, the services can be configured by setting the Trigger Condition parameter in Routing Attributes . There are four types of trigger conditions: 1. Rerouting is triggered when any LSP is interrupted. 2. Rerouting is triggered when both LSPs are interrupted. 3. Rerouting is not triggered. 4. Rerouting is triggered based on the flex P&R protection policy.

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.

Differences between dual-homing diamond services and associated services
Dual-homing diamond services have similar application scenarios to associated silver services originated from the same source. They differ in the number of managed services. Specifically, two services are managed for associated silver services, but only one ASON service needs to be managed for a dual-homing diamond service. Associated silver services originated from the same source can be converted into dual-homing diamond services.

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