HFL Notification for Resilient Ethernet Protocol Link Failure
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Solution Overview
Problem
Conventional link failure detection and resolution protocols in Resilient Ethernet Protocol (REP) networks, such as REP, struggle to meet stringent convergence rate requirements for applications like Connected Factory (CF), where downtime costs are substantial, and existing methods like Link Status Layer (LSL) messages introduce delays due to positive acknowledgement protocols.
Innovation Solution
Implementing a Hardware Flood Layer (HFL) notification system with a Time-to-Live (TTL) value of 2 to ensure all network switches receive link failure notifications, and maintaining HFL message status information to prevent unnecessary MAC table flushes, thereby optimizing link failure detection and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional REP link failure detection protocols are used, then network reliability is maintained, but convergence rate is too slow to meet stringent CF application requirements
Solution Approach 1:
The patent implements preliminary action by pre-configuring HFL notification mechanisms with TTL values and MAC table flush procedures before link failures occur. When a link failure is detected, the pre-established HFL notification system immediately activates, bypassing conventional slower detection protocols and enabling rapid convergence while maintaining reliability through structured notification propagation.
2Reliability
If LSL messages with positive acknowledgement protocols are used, then link failure detection reliability is improved, but convergence time increases due to acknowledgment delays
Solution Approach 1:
The patent extracts the acknowledgment requirement from the link failure detection process by implementing unidirectional HFL notifications that do not require positive acknowledgments. The HFL notification is sent from the detecting switch to other switches in the REP segment, and the detection is considered complete without waiting for acknowledgments, thereby eliminating acknowledgment delays while maintaining detection reliability through the structured notification mechanism.
3Speed
If HFL notifications are sent to all switches in REP segment, then convergence rate is improved, but unnecessary MAC table flushes occur increasing device complexity
Solution Approach 1:
The patent applies local quality by implementing selective MAC table flush operations based on the specific link failure location and the HFL notification propagation path. Instead of flushing MAC tables on all switches regardless of their position relative to the failure, the system identifies which switches actually need to flush their tables based on local conditions, thereby reducing unnecessary operations and device complexity while maintaining rapid convergence.
Data Source
AI summary
Embodiments provide techniques for optimizing link failure convergence for Resilient Ethernet Protocol (REP) networks. Embodiments include monitoring for link failure events within the REP environment. Additionally, upon determining, at a first network switch within the REP environment, that a link failure event has occurred within the REP environment, embodiments include transmitting a Hardware Flood Layer (HFL) notification data packet specifying a Time-to-Live (TTL) value of 2 to a second network switch within the REP environment and purging contents of a Media Access Control (MAC) table on the first network switch.