Network Node Service Protection Using Virtual Paths and Bandwidth Activation
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Solution Overview
Problem
Current optical transmission networks face slow recovery times and high resource occupation costs due to the limitations of existing protection methods such as ASON, which require real-time rerouting after fiber cuts and dedicated 1+1 protection groups.
Innovation Solution
A service protection method that establishes a virtual connection of a protection path before a fault occurs, allowing for quick end-to-end recovery by sending bandwidth activation messages along the protection path, reducing the need for additional resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If dedicated 1+1 protection group is configured to implement fast service switching, then service recovery speed is improved, but resource occupation cost increases due to requiring twice the resources
Solution Approach 1:
The protection path is pre-established with virtual connection before fault occurs, but bandwidth resources are not fully allocated until needed. The head node pre-configures the protection path topology and sends bandwidth activation messages only when working path failure is detected, enabling fast switching without permanently reserving full bandwidth resources.
Solution Approach 2:
The protection mechanism transitions from static resource reservation (dedicated 1+1 protection) to dynamic resource allocation (shared protection with bandwidth activation). The protection path bandwidth is dynamically adjusted based on whether fault conditions exist, allowing resources to be shared during normal operation and activated only when needed.
2Reliability
If ASON real-time rerouting is performed after fiber cut, then service recovery capability is provided, but recovery time is slow at hundreds of milliseconds
Solution Approach 1:
The protection path is pre-established with virtual connection and routing information before any fault occurs. When working path failure is detected, the head node can immediately activate the pre-configured protection path without performing time-consuming route calculation and establishment, reducing recovery time from hundreds of milliseconds to much faster levels.
Solution Approach 2:
A virtual connection copy of the working path is pre-established as the protection path with identical routing information. This virtual copy allows immediate failover without needing to recalculate routes, as the protection path topology is already prepared and stored in the network nodes.
Data Source
AI summary
Embodiments of this application provide a service protection method, including: A first node determines that a fault occurs on a first working path; the first node generates a bandwidth activation message based on the fault, where the bandwidth activation message indicates a third node to adjust a bandwidth of a service from a protection bandwidth to a target bandwidth, the protection bandwidth represents a pre-occupied bandwidth of a first protection path before transmission of the service, and the target bandwidth represents an actual occupied bandwidth for transmission of the service; and the first node sends the bandwidth activation message on the first protection path.