Relay Device Redundant Port Abnormality Detection
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Solution Overview
Problem
In Ethernet ring-type networks, the existing methods for detecting abnormalities in communication paths require frequent transmission of abnormality detection frames, which can interfere with the transmission of normal data frames, leading to potential data loss.
Innovation Solution
A relay device with redundant ports and a disruption determination unit that transmits abnormality detection frames only when necessary, reducing the frequency of transmission and preventing normal frame disruption by determining frame disruptions and transmitting abnormality detection frames accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If abnormality detection frames are transmitted frequently to detect communication path abnormalities, then abnormality detection capability is improved, but normal data frame transmission is interfered with and data loss occurs
Solution Approach 1:
The patent implements periodic abnormality detection by transmitting abnormality detection frames at predetermined time intervals rather than continuously or frequently. The disruption determination unit checks frames received at regular intervals, and only transmits abnormality detection frames when disruptions are detected, thereby reducing interference with normal data transmission while maintaining effective abnormality monitoring
Solution Approach 2:
The system uses the normal data frames themselves as the detection mechanism. The disruption determination unit determines whether normal frames transmitted from other relay devices are received correctly through redundant ports. This self-service approach eliminates the need for separate frequent detection frames, as the normal traffic carries the detection function, thereby preventing data loss while maintaining detection capability
2Loss of time
If abnormality detection frames are transmitted frequently, then abnormality detection speed is improved, but communication path congestion increases
Solution Approach 1:
Abnormality detection is performed periodically at predetermined time intervals rather than continuously. The disruption determination unit checks frames received during these periodic intervals, and abnormality detection frames are transmitted only when disruptions are detected, reducing communication path congestion while maintaining timely abnormality detection
Solution Approach 2:
The system utilizes existing normal data frame transmission as the detection mechanism. By determining whether normal frames are received correctly through redundant ports, the system achieves detection without adding separate detection traffic, thereby preventing communication path congestion while maintaining detection speed
Data Source
AI summary
A relay device, connected to another relay device by a communication line, includes: multiple ports having two redundant ports connected to communication lines for providing redundant transfer paths between relay devices; a disruption determination unit determining whether a frame transmitted from a target relay device and received through one of the redundant ports is disrupted; an abnormality transmitter transmitting an abnormality detection frame to the target relay device when the frame is disrupted; a response receiver determining whether a response frame is received from the target relay device after the abnormality transmitter transmits the abnormality detection frame; and an abnormality determination unit determining that an abnormality occurs in one of the communication lines between the target relay device and the relay device when the response frame is not received.