Rerouting rules of Huawei WDM/OTN ASON systems

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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

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