SDN Control Plane Failure Injection for Resilience Testing
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Solution Overview
Problem
Existing software-defined networking (SDN) technologies face challenges in evaluating the resilience and availability of their control planes due to the complexity and distributed nature of these systems, making it impractical to fully reproduce operational conditions in testing environments, and traditional software testing techniques are insufficient for assessing fault-tolerance mechanisms.
Innovation Solution
A failure injection methodology is employed to deliberately introduce failures into SDN control planes, both in testbed and production environments, to evaluate resilience and reliability by simulating real-world conditions, using a configurable software infrastructure that assesses the effectiveness of failure detection and mitigation mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional software testing techniques are used to evaluate SDN control plane resilience, then testing can be performed in controlled environments, but the testing cannot fully reproduce operational conditions and is insufficient for assessing fault-tolerance mechanisms
Solution Approach 1:
The system dynamically adapts the testing environment by injecting failures in real-time during operational conditions rather than using static pre-configured test scenarios. The failure injection mechanism actively modifies system state during runtime to simulate realistic fault conditions that traditional static testing cannot reproduce.
Solution Approach 2:
The patent transitions from traditional single-dimension testing (controlled environment only) to a multi-dimension approach by combining production environment testing with virtualized testbeds. This allows simultaneous evaluation in both realistic operational conditions and controlled experimental settings, bridging the gap between testability and realism.
2Reliability
If failure injection is performed in production environments, then realistic operational conditions can be simulated, but system complexity and risk of affecting actual services increase
Solution Approach 1:
A virtualized testbed acts as an intermediary layer between the physical SDN infrastructure and the failure injection mechanism. This intermediary replicates production environment characteristics while providing a controlled sandbox that isolates actual services from direct failure injection risks, reducing both complexity and risk.
Solution Approach 2:
The system creates virtual copies of the SDN control plane and network infrastructure in a testbed environment. These copies replicate production topology, configuration, and behavior sufficiently to enable realistic failure injection testing without directly impacting actual services, thereby managing complexity while maintaining realism.
3Measurement precision
If comprehensive failure scenarios are injected to fully assess resilience, then measurement accuracy improves, but testing time and system disruption increase
Solution Approach 1:
The system employs a staged failure injection approach where common and critical failure scenarios are injected first to achieve sufficient resilience assessment accuracy without exhaustively testing every possible failure mode. This partial action approach achieves practical measurement accuracy while constraining testing time and disruption.
Solution Approach 2:
Failure injection testing is performed periodically on replicated virtual instances rather than continuously on the live system. This periodic approach on copies allows comprehensive scenario testing to accumulate measurement accuracy over time without causing continuous disruption to actual services.
Data Source
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AI summary
Various example embodiments for supporting control plane resiliency testing in a software defined network are presented. Various example embodiments for supporting control plane resiliency testing in a software defined network may be configured to support control plane resiliency testing in a software defined network based on use of failure injection. Various example embodiments for supporting control plane resiliency testing in a software defined network based on use of failure injection may be configured to support control plane resiliency testing in a software defined network by injecting failures into the software defined network, monitoring the software defined network after the injection of the failures and collecting results data from the software defined network related to the injection of the failures, and evaluating resiliency of the control plane of the software defined network based on the results data from the software defined network related to the injection of the failures.