Ring Network Label Switching for Fast Failure Bypass
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Solution Overview
Problem
Conventional ring network protection systems with label switching face complexity in label table management and prolonged path switching times due to increased nodes or links, necessitating inefficient connectivity verification through loopback tests.
Innovation Solution
Pre-set labels on directional links between adjacent nodes, using failure notifying messages to form bypass paths, and update label tables in nodes, enabling efficient label management and rapid path switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the number of nodes or links on the ring is increased, then the network capacity and coverage are improved, but the label table management becomes complicated and the switching processing time increases
Solution Approach 1:
The invention segments the label table into two distinct parts: a basic label table that remains constant regardless of network size, and a dynamic label table that is generated only when failures occur. This segmentation allows the network to scale without proportionally increasing the management complexity of label tables, as the basic structure remains simple while only minimal dynamic updates are needed as nodes are added.
Solution Approach 2:
The invention pre-configures the basic label table with all necessary information for potential bypass paths before any failures occur. This preliminary action eliminates the need for complex real-time calculations when failures happen, as the framework for path switching is already established. The basic label table contains pre-computed information that enables rapid response to failures without requiring complex on-the-fly label table management.
2Reliability
If the number of redundant paths is increased to ensure protection at arbitrary sites, then the reliability is improved, but the label table size increases and management becomes harder
Solution Approach 1:
The invention segments the redundancy management into a static basic label table that defines the network topology and potential bypass capabilities, and a dynamic component that activates specific bypass paths only when failures occur. This allows the system to maintain comprehensive protection capability while keeping the stored label information minimal and manageable, as not all potential bypass paths need to be actively managed simultaneously.
Solution Approach 2:
The basic label table is designed to be universal and applicable to any failure scenario in the network. Instead of maintaining separate label tables for each possible failure case, the basic label table contains generalized information that can be used to determine appropriate bypass paths for any failure location. This multi-functional approach reduces the overall label table size while maintaining comprehensive protection capability.
3Reliability
If a turning-back test is performed to verify bypass path connectivity, then the path switching reliability is improved, but the switching processing time increases
Solution Approach 1:
The invention performs preliminary configuration of the basic label table during normal network operation, before any failures occur. This pre-computation and pre-organization of label information eliminates the need for time-consuming connectivity verification tests when failures happen. The basic label table is already optimized and ready to use, allowing immediate path switching without requiring turning-back tests that would delay the protection activation.
4Adaptability or versatility
If the label table is rewritten dynamically at failure occurrence, then the adaptability to failures is improved, but the switching processing time increases
Solution Approach 1:
The invention segments the label table update process into minimal dynamic updates based on the actual failure location, rather than rewriting the entire label table. The basic label table remains intact and provides the framework, while only the specific entries related to the failed path need to be dynamically adjusted. This segmented approach maintains high adaptability to different failure scenarios while significantly reducing the time required for label table rewriting compared to complete reconfiguration.
Data Source
AI summary
According to the transmission method, labels to be used at the failure occurrence are previously and individually set to links in respective directions among all nodes on the one directional link connecting between adjacent nodes basis, and when a failure occurs, a failure notifying message is sent out onto a same directional ring from a termination node of a failed block, to be sequentially transferred to each downstream node, and a label table for connecting the links in cooperative with the reception of the failure notifying message is created in each node, and also, a bypassing path is formed by turning back the rings at both end nodes of the failed block. Thus, in a ring network of label switching system, it becomes possible to easily perform the label table management and also to set a bypassing path in a short time at the failure occurrence.