Deterministic Frame Fragmentation Testing for Ethernet Preemption
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Solution Overview
Problem
Current test tools for evaluating frame preemption and fragmentation in Ethernet networks are unable to provide repeatable test conditions, making consistent evaluation of devices under test for specific frame preemption conditions impossible due to random fragmentation.
Innovation Solution
A method and system for testing the effects of simulated frame preemption and deterministic fragmentation, where a device under test generates and transmits simulated preempted frame fragments and express frames in a deterministic order, allowing for repeatable testing and verification of device operation according to specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If random fragmentation is used to test frame preemption effects, then the test tool can generate varied test conditions, but the test conditions become non-repeatable and consistent evaluation is impossible
Solution Approach 1:
The patent changes the fragmentation approach from random to deterministic by controlling fragmentation parameters (fragment size, fragmentation trigger conditions) to produce repeatable test results. The test tool now uses configurable fragmentation parameters that can be set to generate consistent fragmentation patterns across multiple test runs, enabling reliable evaluation of frame preemption effects while maintaining test condition variety through parameter configuration.
2Reliability
If frames are preempted and fragmented to avoid head-of-line blocking, then quality of service for time-critical traffic improves, but the complexity of network testing increases due to need for repeatable test conditions
Solution Approach 1:
The patent creates a simplified copy of the complex frame preemption and fragmentation process for testing purposes. The test tool generates virtual representations of preempted frames and their fragments, allowing reproduction of QoS improvement scenarios without needing to implement the full complex frame preemption mechanism in the test environment. This copying approach maintains the essential QoS benefits while reducing testing complexity through controlled simulation.
Data Source
AI summary
Methods, systems, and computer readable media for testing effects of simulated frame preemption and deterministic fragmentation of preemptable frames in a frame-preemption-capable network are disclosed. According to one method, a device under test including at least one processor simulates frame preemption by generating a plurality of simulated preempted frame fragments and an express frame. The test device deterministically orders, independently from MAC merge sublayer fragmentation and ordering, the simulated preempted frame fragments and the express frame for transmission to the DUT. The test device transmits the simulated preempted frame fragments and the express frame to the DUT in an order corresponding to the deterministic ordering. The test device receives a response of the DUT to the simulated preempted frame fragments and the express frame. The test device determines, based on the response of the DUT, whether the DUT operates in accordance with specifications for frame preemption.