Transit Node Performance Notification for LSP Blackholing
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Solution Overview
Problem
In Label Switched Path (LSP) networks, transit nodes often encounter performance issues such as hardware or software problems that lead to traffic drop, misrouting, or incorrect handling, causing traffic blackholing, which is not detectable by ingress nodes, resulting in failed delivery of traffic from ingress to egress nodes.
Innovation Solution
Transit nodes identify performance issues and generate messages to notify ingress nodes, allowing them to perform actions like assessment or termination of the LSP, thereby preventing traffic blackholing by establishing a new path that bypasses the affected node.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If transit nodes operate without performance monitoring, then device complexity is reduced, but traffic blackholing occurs due to undetected performance issues
Solution Approach 1:
The patent implements a feedback mechanism where transit nodes continuously monitor their own performance metrics (CPU utilization, memory usage, interface status) and send notifications to ingress nodes when performance thresholds are exceeded. This feedback loop enables proactive detection of performance issues before they cause traffic blackholing, resolving the contradiction between reliability and complexity by introducing targeted monitoring only at transit nodes.
Solution Approach 2:
The transit node performs self-diagnosis by monitoring its own performance metrics and autonomously generating performance notifications when issues are detected. This self-service approach eliminates the need for external monitoring systems, maintaining low device complexity while ensuring high reliability through continuous self-assessment and automatic notification to ingress nodes.
2Reliability
If ingress nodes continuously monitor transit nodes, then traffic blackholing is detected earlier, but resource usage increases
Solution Approach 1:
The transit node performs preliminary monitoring and assessment of its own performance status before traffic blackholing occurs. By proactively evaluating its performance metrics and sending notifications in advance, the transit node eliminates the need for continuous monitoring by ingress nodes, reducing their resource usage while maintaining early detection capability.
Solution Approach 2:
The system uses feedback from transit nodes about their performance status instead of continuous active monitoring by ingress nodes. This passive feedback mechanism significantly reduces resource usage at ingress nodes while maintaining the ability to detect and respond to performance issues that could lead to traffic blackholing.
3Productivity
If performance issues are not detected, then resource usage is minimized, but traffic delivery fails
Solution Approach 1:
The transit node autonomously monitors its own performance metrics including CPU utilization, memory usage, and interface status, and self-generates performance notifications when thresholds are exceeded. This self-service monitoring ensures traffic delivery issues are detected without requiring additional network resources for external monitoring systems, resolving the contradiction between productivity and energy loss.
Solution Approach 2:
The system implements feedback mechanisms where transit nodes report their performance status to ingress nodes, enabling proactive response to potential traffic delivery failures. This feedback loop prevents traffic blackholing while minimizing resource waste by only activating monitoring and notification mechanisms when performance issues are actually detected, rather than continuously consuming resources.
Data Source
AI summary
In some implementations, a transit node associated with a label switched path (LSP), may identify a performance issue of the transit node. The transit node may generate, based on identifying the performance issue, a message associated with the performance issue. The transit node may send, to an ingress node associated with the LSP, the message to allow the ingress node to perform one or more actions associated with the LSP. The one or more actions associated with the LSP may include performance of an assessment operation associated with the LSP and/or initiation of a termination operation associated with the LSP.