Ring Network Label Switched Path Creation Reducing Control Overhead
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Solution Overview
Problem
The number of point-to-point Label Switched Paths (LSPs) created for ring network protection increases exponentially with the number of nodes, leading to significant control overhead in existing ring network protection mechanisms.
Innovation Solution
A method where a node allocates the same label to identical path segments of LSPs with the same destination node within a ring network, allowing for the merging of these path segments and reducing the number of LSPs created and maintained, by sending a Path message and a Resv message to allocate and reserve resources for LSPs with the same destination node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two point-to-point LSPs are created between each two nodes for ring network protection, then network protection capability is improved, but the number of LSPs increases exponentially with the number of nodes, leading to large control overhead
Solution Approach 1:
The patent merges multiple point-to-point LSPs into a single ring LSP by allocating the same label to identical path segments of LSPs with the same destination node within a ring network. This consolidation reduces the exponential number of individual LSPs into a linear number of ring LSPs, significantly decreasing control overhead while maintaining protection capability through the ring structure.
Solution Approach 2:
The patent makes a single ring LSP serve multiple functions by allowing it to provide protection for multiple working LSPs simultaneously. The ring LSP acts as a shared backup resource that can protect any working LSP that fails, replacing the need for dedicated backup LSPs for each node pair and reducing overall LSP count.
2Reliability
If two point-to-point LSPs are created between each two nodes for ring network protection, then network protection capability is improved, but the number of LSPs increases exponentially with the number of nodes
Solution Approach 1:
The patent merges multiple point-to-point LSPs into a single ring LSP by allocating the same label to identical path segments of LSPs with the same destination node within a ring network. This consolidation reduces the exponential number of individual LSPs into a linear number of ring LSPs, significantly decreasing control overhead while maintaining protection capability through the ring structure.
3Reliability
If multiple point-to-point LSPs are created for ring network protection, then network protection capability is improved, but maintenance complexity increases
Solution Approach 1:
The patent merges multiple point-to-point LSPs into a single ring LSP by allocating the same label to identical path segments of LSPs with the same destination node within a ring network. This consolidation reduces the exponential number of individual LSPs into a linear number of ring LSPs, significantly decreasing control overhead while maintaining protection capability through the ring structure.
Data Source
Figure 1-a~1-b
Figure 2~3
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AI summary
Embodiments of the present invention disclose a method for creating a ring network label switched path, a device, and a communications system. A method for creating a ring network label switched path includes: receiving, by a first node, a first Path message used for creating a first label switched path from a second node; allocating a first label to the first label switched path; sending a first Resv message carrying the first label to the second node; and when the first node receives a second Path message used for creating a second label switched path from the second node and determines that a destination node of the second label switched path is the same as that of the first label switched path, and the first node, the second node, and the destination node are located in a same ring network, allocating, by the first node, the first label to the second label switched path; and sending a second Resv message carrying the first label to the second node. Solutions of the embodiments of the present invention helps reduce the number of created ring network label switched paths and maintenance complexity.