Single-Instance TWAMP for SD-WAN Round-Trip Link Measurement
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Solution Overview
Problem
Existing Two-Way Active Measurement Protocols (TWAMP) for network performance measurement in fully converged Software Defined Wide Area Networks (SD-WAN) require multiple instances to measure round-trip metrics, leading to increased bandwidth and computational resource consumption.
Innovation Solution
Enhanced TWAMP protocol allows network devices to execute dual roles as TWAMP controller and responder within a single instance, enabling independent network performance calculations using embedded metrics and delta compute times, reducing the need for multiple instances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple TWAMP instances are used to measure round-trip metrics, then measurement completeness is improved, but bandwidth consumption and computational overhead increase
Solution Approach 1:
The patent combines multiple TWAMP instances into a single instance by allowing one network device to execute dual roles as both TWAMP controller and responder. This merging approach enables complete round-trip metrics measurement while reducing bandwidth consumption and computational overhead by half, as the single instance shares control and measurement functions between the two network devices.
Solution Approach 2:
The patent implements multi-functionality by enabling a single network device to perform both TWAMP controller and TWAMP responder roles within the same instance. This universal design allows the device to independently calculate network performance metrics in both directions using embedded metrics and delta compute times, eliminating the need for separate dedicated controller and responder devices.
2Measurement precision
If multiple TWAMP instances are established for bidirectional measurements, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple TWAMP instances into one by allowing dual role execution on a single device. The controller-responder pair acts as responder-controller simultaneously during the same TWAMP instance, reducing device complexity from multiple instances to a single instance while maintaining measurement accuracy through independent calculations by both devices using shared test packets.
Solution Approach 2:
The patent enables universal functionality where each network device can independently perform network performance calculations using metrics embedded within test packets exchanged in a single TWAMP instance. This multi-functional capability allows both devices to calculate round-trip metrics without requiring multiple dedicated instances, thereby reducing device complexity.
3Productivity
If dual roles are executed in a single TWAMP instance, then resource efficiency is improved, but role management complexity increases
Solution Approach 1:
The patent implements dynamic role execution where network devices can switch between controller and responder roles within the same TWAMP instance. The controller-responder pair acts as responder-controller simultaneously, allowing flexible resource allocation and dynamic adaptation to network conditions while maintaining clear role definitions through standardized protocol interactions.
Solution Approach 2:
The patent uses feedback mechanisms where each device independently calculates network performance metrics and can share results with the other device. This feedback loop ensures accurate measurement while simplifying role management, as each device operates autonomously based on received test packets and embedded metrics, reducing the complexity of coordinated role management.
Data Source
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AI summary
Techniques are described for an enhanced two-way active measurement protocol (TWAMP) to measure network performance of links and/or network paths in a fully converged Software Defined Wide Area Network (SD-WAN), using a single TWAMP instance. In one example, a first network device executing a TWAMP session-sender may send a test packet embedded with one or more metrics to the TWAMP session-reflector executed by another network device, which reflects the test packet embedded with one or more metrics back to the TWAMP session-sender. The TWAMP session-sender may further reflect a test packet embedded with one or more additional metrics back to a TWAMP session-reflector to enable the network devices to independently perform network performance calculations using the metrics embedded within the test packets exchanged in a single TWAMP instance.