Selective Broadcast Bridge for Network Protection Switching
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Solution Overview
Problem
Existing protection switching methods in networks, particularly in non-reverse mode, often result in unnecessary resource wastage due to continuous traffic copying between working and protection paths even after fault restoration, and frequent path changes can disrupt traffic transfer.
Innovation Solution
A method and apparatus that utilize a selective broadcast bridge with a path search unit, first and second switches, and a controller to dynamically switch traffic between working and protection paths based on fault detection and restoration, maintaining the switch states to prevent unnecessary resource usage and optimize path selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a permanent bridge is used to continuously copy traffic to both working and protection paths, then traffic transmission reliability is improved, but network resource wastage increases
Solution Approach 1:
The patent implements dynamic bridge operation modes (permanent, selective, broadcast) that can be switched based on fault conditions. The bridge transitions from continuously copying traffic in normal mode to selective copying only when faults are detected, making the system adaptive rather than static. This resolves the contradiction by maintaining reliability through dynamic response while reducing resource wastage through conditional operation.
Solution Approach 2:
The patent changes the operational parameters of the bridge by switching between different modes (permanent, selective, broadcast) based on fault detection. When no fault is present, the bridge operates in permanent mode with continuous copying for reliability. When faults are detected, it switches to selective or broadcast modes to reduce resource consumption. This parameter change approach allows the system to optimize between reliability and resource efficiency based on real-time conditions.
2Loss of energy
If a selector bridge is used to switch traffic paths based on fault detection, then network resource efficiency is improved, but traffic transfer stability deteriorates due to frequent path changes
Solution Approach 1:
The patent introduces a wait-to-restore (WTR) timer that acts as a cushioning mechanism before switching paths back to the working path after fault restoration. This timer prevents premature switching that could cause frequent path changes, thereby stabilizing traffic transfer. The WTR timer ensures that path switching only occurs after a predetermined period, cushioning against unstable conditions and maintaining traffic transfer stability while still allowing resource-efficient path selection.
3Measurement precision
If traffic is continuously copied to both working and protection paths, then path failure detection capability is improved, but bandwidth utilization deteriorates
Solution Approach 1:
The patent implements partial copying of traffic instead of continuous full copying. In normal operation, the bridge uses selective mode where traffic is copied only when faults are detected, rather than continuously copying to both paths. This partial action approach maintains sufficient path failure detection capability while significantly improving bandwidth utilization by avoiding unnecessary continuous copying when paths are healthy.
Data Source
AI summary
A protection switching unit and a method of performing protection switching of the protection switching unit are provided. The method includes steps of detecting a fault that has occurred at a working path of a network; opening a first switch that is connected to the working path and closing a second switch that is connected to the protection path of the network; and maintaining a connection state of the first switch and the working path and a connection state of the second switch and the protection path, when a fault that has occurred at the working path is restored.