RPR Node Protection Switching via Frame Boundary Path Wrapping
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Solution Overview
Problem
The existing Resilient Packet Ring (RPR) network lacks a specific technical scheme to implement the Wrapping mode for protection switching, which is a fast but data-loss-free method, limiting its effectiveness in fault recovery.
Innovation Solution
A protection switching method and apparatus that utilize inner and outer ringlets to switch data paths at frame boundaries, allowing seamless transition between normal and WRAP data paths without packet loss, using switching modules to manage data transmission between ringlets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Wrapping mode protection switching is implemented in RPR network, then fast and data-loss-free fault recovery is achieved, but no specific technical scheme existed to implement it
Solution Approach 1:
The patent implements preliminary action by pre-configuring the Wrapping mode protection switching mechanism in RPR nodes. When a fault occurs, the switching logic is already in place to immediately redirect traffic through the alternate path without requiring complex real-time decision-making or handshaking protocols, thus achieving fast and data-loss-free recovery.
Solution Approach 2:
The patent applies self-service by enabling RPR nodes to automatically detect faults and execute protection switching without external intervention. The nodes monitor their own state, detect disruptions, and autonomously redirect traffic through the Wrapping mode path, eliminating the need for complex control signals or interactive protocols between multiple nodes.
2Reliability
If data path switching is performed at frame boundaries, then no packet loss occurs during switching, but switching can only be executed at discrete time points
Solution Approach 1:
The patent implements periodic action by synchronizing protection switching with the periodic frame boundaries in RPR traffic. Instead of allowing continuous switching at any moment, the system performs switching at regular intervals when frames complete transmission. This periodic approach ensures packet loss-free switching while maintaining simple and predictable timing logic.
Data Source
AI summary
The present invention discloses a protection switching apparatus for nodes in a Resilient Packet Ring (RPR) network, including: a first switching module, for receiving inner ringlet data and transmitting data to the outer ringlet; a second switching module, for receiving outer ringlet data and transmitting data to the inner ringlet; and when it is in a normal mode, each of the switching modules transmits the received ringlet data to the other switching module connected to itself, and the received ringlet data are transmitted through normal data paths; when protection switching is required and frame boundaries of data are reached, the first and second switching modules directly switch data paths within themselves, and transmit the received ringlet data through WRAP data paths. At the same time, a protection switching method for nodes in an RPR network is provided. This invention is easy to realize, and data path switching is performed at frame boundaries of data transmission, thus no packet will be lost and reliability of RPR network nodes is guaranteed.