Rerouting policies of diamond services

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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.

Other related questions:
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.

Trigger alarms of optical-layer service rerouting
Optical-layer service rerouting can be triggered when alarms such as R_LOS, OTUk_LOF, and OTUk_LOM are reported only on OTU boards.

Rerouting policy when ASON network resources are insufficient
Rerouting policy when ASON network resources are insufficient: When the resource of a link is insufficient, the VC4 service will be rerouted to a different link until there is no idle resources.

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

Method used to select routing policies on an ASON network
Various rerouting policies are provided on an ASON network and are selected based on the available system resources. When the resources are sufficient, diamond services can be used. As resources are continuously consumed, a user may have to select copper services to ensure that sufficient resources are provided for diamond services. Copper services are rarely used. Generally, only temporary services are configured as copper services.

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