Whether a new route can be set as the original route on an OTN ASON network


Generally, a route created by the ASON software is the original route. When an original ASON route is changed, the new route can be set as the original route.

Other related questions:
Can public network routes be iterated to tunnels on S series switches
Q: Can public network routes be iterated to tunnels? A: For S series switches, by default, an unlabeled public network route can only be iterated to the outbound interface and next hop, but not a tunnel. If the route recursive-lookup tunnel command is executed, an unlabeled public network route can inherit the tunnel ID of an IGP or static route, allowing packets to be forwarded through MPLS routes. The route recursive-lookup tunnel command enables the switch to iterate unlabeled public network routes to tunnels. This command is valid only to unlabeled public network routes that require tunnel iteration. To control tunnel iteration more precisely, you can filter unlabeled public network routes by specifying an optional IP prefix list. The undo route recursive-lookup tunnel command disables tunnel iteration.

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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