Precautions for setting rerouting trigger conditions on an ASON network


Rerouting trigger conditions are determined based on the number of available network resources and service importance.
If there are sufficient resources or protected services are important, you can select the policy of triggering rerouting when any LSP fails. In this way, 1+1 protection is retained for services under SNCP protection or optical-layer associated services, and quick switching can be achieved upon a fault. Even if a rerouting failure occurs, the failure can be detected in a timely manner.
If there are insufficient resources or the protected services are less important, you can select the policy of rerouting when both LSPs fail. In this way, the 1+1 protection provided for the services can survive only one fault. When both LSPs fail and service rerouting is triggered, the service will be interrupted for a short time (depending on the rerouting time), or be interrupted for a long time if rerouting fails.

Other related questions:
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.

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 rules of Huawei WDM/OTN ASON systems
Through traffic engineering, a WDM/OTN ASON network has various rerouting constrains: 1. Constraints on explicit network resources: explicit nodes, links, wavelengths, and channels 2. Constraints on excluded network resources: excluded nodes and links 3. Limitation on the quantity of nodes (or hops) traversed by a strict route or service 4. Limitation on the reach of an optical fiber carrying services, loading sharing mode, SRLGs, and associated services 5. Combinations of the preceding constraints

Parameters that are considered and computed for ASON rerouting
To achieve dynamic rerouting for optical-layer ASON services and ensure service transmission quality, optical parameters must be considered, such as OSNR, CD, and PMD. In addition, they need to be included in service routing constraints.

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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