Optical Network Shared Mesh Protection Sublabel Allocation
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Solution Overview
Problem
Existing optical network systems face challenges in implementing shared mesh protection, relying heavily on manual configuration and complex network management, which increases operational risks and slows down fault recovery due to the complexity of distinguishing service messages in Automatic Protection Switching (APS) overhead.
Innovation Solution
A method and device that allow each node on a protection path to accurately and simply determine the service to be recovered by allocating and transmitting sublabels indicating recovery information, enabling automatic and quick protection switchover through the use of Resource reSerVation Protocol-Traffic Engineering (RSVP-TE) within the GMPLS signaling protocol.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual configuration on network management system is used to implement shared mesh protection, then service protection can be established, but configuration operation becomes extremely complex and network operation risk increases
Solution Approach 1:
The patent implements self-service by enabling nodes to automatically allocate and distribute sublabels along the protection path without requiring manual configuration. Each node automatically determines the service to be recovered and configures the protection switching mechanism, eliminating the need for complex manual setup on network management systems.
Solution Approach 2:
The patent applies preliminary action by pre-establishing the protection path and pre-allocating sublabels before any fault occurs. The sublabels are distributed in advance along the protection path, so when a fault happens, the protection switching can be executed immediately without requiring real-time configuration or manual intervention.
2Adaptability or versatility
If multiple service messages need to be distinguished in APS overhead, then shared mesh protection can be implemented, but the complexity of distinguishing service messages increases operational risk
Solution Approach 1:
The patent segments the APS overhead by introducing sublabels that are specifically allocated for each service on the protection path. Instead of handling multiple service messages as a whole, the system divides them into distinct sublabel-based channels, making it easier to identify and process each service's recovery information independently.
Solution Approach 2:
The patent applies local quality by assigning specific sublabels to specific services at each node along the protection path. Each node uses the locally allocated sublabel to identify the particular service it needs to protect, creating a localized identification mechanism that simplifies the overall message distinction process.
3Reliability
If control plane rerouting technology is used to recover optical network connection, then service transmission reliability can be improved, but fault recovery duration becomes generally long
Solution Approach 1:
The patent implements preliminary action by pre-establishing protection paths and pre-allocating sublabels before faults occur. When a fault happens, the system can immediately switch to the pre-configured protection path without needing to recalculate routes or perform complex control plane rerouting operations, significantly reducing recovery time.
Solution Approach 2:
The patent extracts the protection switching function from the general control plane rerouting process. By using dedicated sublabels and a simplified switching mechanism, the system separates the fast protection switching operation from the slower control plane rerouting, allowing immediate local switching without waiting for comprehensive network-wide rerouting calculations.
Data Source
AI summary
Embodiments of the present invention disclose a method for implementing shared mesh protection includes: receiving, by a first node, a message of a second type sent by a second node, where the message of the second type carries a second positive incoming sublabel allocated by the second node for a protection path of a first service and the second positive incoming sublabel is used to indicate a specified feature of recovery information of the first service; allocating, by the first node, a first positive outgoing label for the protection path of the first service based on the second positive incoming sublabel, where the first positive outgoing label corresponds to the second positive incoming sublabel; and transmitting the recovery information of the first service to the second node based on an indication of the first positive outgoing sublabel when knowing that a working path of the first service is faulty.