Connectionless Network Service Protection Switching
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Solution Overview
Problem
Current connectionless network protection switching methods face complexity and flooding issues due to tree-based switching, where all data packets are switched upon failure, leading to out-of-sequence service data packets and unnecessary service disruptions.
Innovation Solution
Implementing a point-to-point protection switching method where each protection switching point detects failures and switches only affected service paths, avoiding tree-based switching to prevent flooding and ensure sequence integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tree-based protection switching is implemented in connectionless networks, then service protection is achieved, but flooding occurs and service data packets become out of sequence
Solution Approach 1:
The patent segments the flow domain into multiple independent point-to-point service paths between protection switching points. Instead of treating the entire flow domain as a single tree structure where failure triggers global switching, each service path is independently identified and protected. This segmentation allows selective switching of only affected paths while maintaining proper data packet sequencing through path-specific forwarding tables.
2Reliability
If tree-based protection switching is implemented, then service protection is achieved, but coordination complexity among switching points increases
Solution Approach 1:
Each protection switching point autonomously detects failures on its connected paths and independently switches affected services without requiring complex coordination with other switching points. The failure detection mechanism monitors path status locally, and the switching decision is made independently at each switching point based on its own detected failures, eliminating the need for complex inter-switching-point coordination protocols.
3Reliability
If whole flow domain protection is implemented, then comprehensive service protection is achieved, but all data packets are switched causing unnecessary service disruptions
Solution Approach 1:
The patent applies local quality by implementing protection switching only for the specific service paths that are actually affected by detected failures, rather than switching all data packets in the entire flow domain. Each protection switching point identifies which specific paths are impacted and switches only those paths, maintaining normal service flow for unaffected paths and minimizing service disruption time.
Data Source
AI summary
A method for service protection switching in a connectionless network is provided. The method includes detecting if there is any failure which may have occurred on the respective path in the working flow domain and protection flow domain, coupled between the protection switching point and each of the at least two remote protection switching points. If any failure occurs on a path in one of the working flow domain and the protection flow domain, the service delivered via the failure-occurred path is switched to a path in the other flow domain for further delivery, where the path in the other flow domain is coupled to the remote protection switching point which is located on the failure-occurred path. A system and a device for service protection switching in a connectionless network are further provided such that the protection switching can be done on a path-by-path basis. Accordingly, the flooding problem caused by the protection switching is avoided effectively.