Full-Duplex Link Flap Damping with Independent Tx/Rx Metrics
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Solution Overview
Problem
Existing link flap damping methods for full-duplex communication links are inadequate as they fail to accurately account for independent state changes in transmit and receive paths, leading to misrepresentation of link flapping and inefficient damping/undamping, causing unidirectional communication issues.
Innovation Solution
A network device maintains separate metrics for transmit and receive paths to accurately assess link flapping, signaling damped states to remote devices, thereby ensuring symmetric behavior and preventing unidirectional communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single link state metric is used for full-duplex links, then the damping mechanism is simpler to implement, but the accuracy of link flapping assessment deteriorates because transmit and receive paths cannot be evaluated independently
Solution Approach 1:
The patent segments the full-duplex link into separate transmit and receive paths, maintaining independent state metrics for each path. This allows accurate assessment of link flapping by evaluating transmit and receive conditions independently, resolving the contradiction between simplicity and accuracy by applying segmentation to the metric structure.
2Speed
If link damping is triggered based on overall link state changes, then the damping response is faster, but unidirectional communication issues arise when transmit and receive paths have different states
Solution Approach 1:
The patent segments the link state evaluation into separate transmit and receive path assessments, allowing independent determination of damping needs for each direction. This prevents unidirectional communication issues by ensuring that damping is applied symmetrically only when both paths require it, while maintaining fast response by evaluating each path independently.
Solution Approach 2:
The patent implements dynamic state tracking for transmit and receive paths separately, allowing the damping mechanism to adapt to changing link conditions in real-time. This dynamic approach ensures that damping responses are both fast and reliable by continuously monitoring path states and adjusting damping application accordingly.
3Measurement precision
If separate metrics are maintained for transmit and receive paths, then the timing accuracy for damping and undamping is improved, but the complexity of the link state management increases
Solution Approach 1:
The patent segments link state management into separate metric maintenance for transmit and receive paths, improving damping timing accuracy by capturing independent state changes. The complexity increase is managed through systematic organization of separate metrics and standardized evaluation procedures for each path.
Solution Approach 2:
The patent implements partial action by maintaining separate metrics only when needed for accurate flapping detection, rather than always using complex multi-path evaluation. This approach achieves improved timing accuracy while controlling complexity by applying separate metric maintenance selectively based on link configuration and failure conditions.
Data Source
AI summary
A network device may be communicatively coupled to a remote device by a full-duplex communication link. The network device may perform link flap damping based on local and remote fault information and may signal, via a remote fault indication, a link flap damping state to the remote device.