Protection Switching Preference Level Synchronization
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Solution Overview
Problem
In protection switching methods, when multiple protection paths are allocated for a single working path, differing preference levels between terminal nodes can lead to disconnection of transport paths during a protection switching event, resulting in abnormal traffic transfer.
Innovation Solution
Terminal nodes determine and share preference levels for protection paths before a protection switching event, ensuring identical preference levels are established between nodes to select the same protection path for traffic switching, using identifiers and APS protocol messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protection paths are allocated for a single working path, then protection switching capability is improved, but preference level inconsistency between terminal nodes causes transport path disconnection
Solution Approach 1:
The patent applies preliminary action by having terminal nodes exchange and determine preference levels for protection paths before a protection switching event occurs. This advance coordination ensures both nodes agree on which protection path to use, preventing transport path disconnection during switching. The preference level information is shared and stored in advance, so when switching is needed, both nodes can immediately select the same path without conflict.
2Adaptability or versatility
If preference levels are not synchronized between terminal nodes, then autonomous protection path selection is improved, but traffic transfer abnormality occurs
Solution Approach 1:
The patent implements feedback by having terminal nodes exchange preference level information and compare it with their own determined preference levels. When inconsistencies are detected, nodes can notify each other and adjust their preference levels to match. This feedback loop ensures both nodes have synchronized preference information, allowing autonomous selection while maintaining traffic transfer normality.
Data Source
AI summary
In a network in which a plurality of protection paths have been formed for one working path between a first node and a second node, each node determines preference levels corresponding to an order to be preferentially used when performing protection switching on the plurality of protection paths. Next, each node exchanges pieces of information about the preference levels determined for the plurality of protection paths.