Dynamic Bypass LSP Bandwidth Threshold Selection
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Solution Overview
Problem
In label-switched networks, the selection of bypass paths often results in communication issues due to insufficient bandwidth, inefficient resource utilization, and unnecessary bandwidth reservation, especially when network traffic is not rerouted during link or node failures.
Innovation Solution
A Point of Local Repair (PLR) device determines a bypass Label-Switched Path (LSP) bandwidth threshold based on the identified protected link or node, compares it with available path bandwidth values, and selects a path that meets the threshold without reserving bandwidth, thereby utilizing existing resources efficiently and reducing communication issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bandwidth is reserved for bypass LSP in advance, then reliability of network traffic rerouting is improved, but network resource utilization deteriorates due to unnecessary reservation when failures do not occur
Solution Approach 1:
The bypass LSP bandwidth threshold is dynamically determined based on the bandwidth value of the protected LSP rather than being statically reserved. This allows the bandwidth allocation to adapt to actual network conditions and failure scenarios, reserving resources only when genuinely needed while improving overall resource utilization efficiency
Solution Approach 2:
The patent changes the parameter approach from fixed bandwidth reservation to threshold-based dynamic determination. The bypass LSP bandwidth threshold is calculated based on the protected LSP's bandwidth value, enabling flexible resource allocation that balances reliability requirements with efficient resource usage
2Loss of energy
If bypass LSP is established without bandwidth reservation, then network resource utilization is improved, but communication issues occur due to insufficient bandwidth availability
Solution Approach 1:
The bypass LSP bandwidth threshold is determined in advance based on the protected LSP's bandwidth requirements. This preliminary calculation ensures that when a failure occurs, the bypass path will have sufficient bandwidth capacity to handle the rerouted traffic, preventing communication issues while avoiding excessive resource reservation during normal operation
3Reliability
If bandwidth threshold is set high for bypass LSP, then communication reliability is improved, but network resource efficiency deteriorates due to excessive bandwidth allocation
Solution Approach 1:
The bandwidth threshold parameter is optimized to be precisely based on the protected LSP's actual bandwidth value rather than being set excessively high. This parameter adjustment ensures adequate bandwidth for reliability while preventing wasteful resource allocation, achieving the right balance between communication reliability and network resource efficiency
Data Source
AI summary
A device may receive information that identifies a bandwidth value of a label-switched path (LSP) that includes a protected link or a protected node. The device may determine a bypass LSP bandwidth threshold based on the bandwidth value. The device may determine a set of path bandwidth values associated with a set of paths. The device may compare the set of path bandwidth values and the bypass LSP bandwidth threshold. The device may select a path, of the set of paths, based on comparing the set of path bandwidth values and the bypass LSP bandwidth threshold. The device may generate a bypass LSP using the path.