SR Tunnel Failover Switching for Multi-Fiber Breakage

The patent pre-calculates and stores escape paths in advance before fiber breakage occurs. The ingress node maintains a pre-computed backup path that can be immediately activated upon failure detection, eliminating the need for real-time protocol calculations during actual failures. This preliminary preparation ensures carrier-grade response times while maintaining routing flexibility through pre-planned alternative paths.

The patent extracts the path calculation complexity from the real-time failure response process. By separating the pre-calculation phase (performed before failures) from the failure response phase (simple path switching), the system reduces operational complexity during critical moments. The ingress node only needs to perform simple path selection based on pre-computed routes rather than complex real-time calculations.

The patent performs path calculation in advance before failures occur, storing escape paths in the ingress node. When fiber breakage is detected through BFD or other detection mechanisms, the system immediately switches to the pre-calculated escape path without any real-time computation. This eliminates service interruption caused by calculation delays while maintaining full routing adaptability through pre-planned alternative routes.

The patent implements carrier-grade protection by pre-calculating and storing escape paths before failures occur. The ingress node maintains a simple switching mechanism that activates pre-computed backup paths upon failure detection. This approach achieves carrier-grade reliability through advance preparation while keeping the actual failure response system simple and efficient.