Fibre Channel Switch Tracer Frame Path Tracing
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Solution Overview
Problem
Current methods for troubleshooting Fibre Channel Storage Area Networks (SANs) are inadequate due to limited information provided by existing tools like traceroute, which cannot effectively handle the variability and complexity of large FC networks, leading to performance issues and difficulty in identifying routing problems.
Innovation Solution
A method involving a 'tracer frame' that traverses the network, with each switch adding information to the frame's payload, including switch identifiers, statistics, and other troubleshooting data, allowing for comprehensive network path tracing and problem identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If traditional traceroute methods are used in FC SANs, then basic path information can be obtained, but the information is insufficient for effective troubleshooting of large, variable FC networks
Solution Approach 1:
The patent segments the network troubleshooting process into discrete information collection points at each switch along the frame path. Each switch independently contributes its local information (routing decisions, latency, port status) to the tracer frame, creating modular, manageable data units that can be collected and analyzed without requiring centralized control of the entire network state.
Solution Approach 2:
The patent performs preliminary information gathering by having each switch pre-populate the tracer frame with relevant diagnostic data as the frame passes through. This preliminary action at each node eliminates the need for separate query operations later, providing comprehensive troubleshooting information in a single traversal pass through the network.
2Reliability
If multiple tracer packets are sent with increasing hop counts, then the path can be determined, but the routing may change between packets making the results erroneous
Solution Approach 1:
The patent maintains continuous useful action by having the tracer frame continuously accumulate information as it traverses each switch in real-time. This continuous information gathering along the actual active path eliminates the discontinuity problem of traditional traceroute, where routing changes occur between separate packet transmissions. The single-frame approach ensures the captured path reflects the actual current routing state.
3Adaptability or versatility
If FC networks grow large with many node ports, then network capacity increases, but troubleshooting performance drops becomes more difficult
Solution Approach 1:
The patent implements self-service by enabling each switch to automatically contribute its own diagnostic information to the tracer frame without requiring external intervention or centralized management. Each switch autonomously provides data about its routing decisions, port status, and performance metrics, allowing the network to self-diagnose issues even as it scales to include thousands of node ports.
Solution Approach 2:
The patent establishes feedback loops where each switch's local state and performance data are fed back into the tracer frame as it passes through. This distributed feedback mechanism provides real-time visibility into network conditions across all switches, enabling detection and measurement of performance problems in large-scale networks without requiring complex centralized monitoring infrastructure.
Data Source
AI summary
Systems and methods for gathering troubleshooting information through one or more networks are disclosed. In one embodiment, the method comprises a switch port configured to receive a frame that has information added by another switch. As the frame traverses the network, control logic in the switch adds additional information into the frame from the current switch.