1+1 Bidirectional Switching Path Consistency
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Solution Overview
Problem
In existing 1+1 end-to-end bidirectional switching systems, selective receiving paths are inconsistent between the head end and tail end when a cross-connect node is present, failing to meet stringent round-trip delay requirements and complicating network maintenance.
Innovation Solution
A method and system for 1+1 end-to-end bidirectional switching that involves a source node receiving candidate path information from a fault-detecting node, acquiring a first path based on this information, and switching services to a data channel corresponding to the first path, ensuring consistency between the head end and tail end by using Resource Reservation Protocol-Traffic Engineering (RSVP-TE) messages to indicate the switched path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual-ended switching is performed between head end and tail end with cross-connect nodes, then protection switching capability is achieved, but selective receiving paths become inconsistent between head end and tail end
Solution Approach 1:
The patent applies preliminary action by pre-establishing a relationship between the selective receiving path at the tail end and the selective sending path at the head end before actual switching occurs. The tail end node determines its selective receiving path based on the head end's selective sending path information, ensuring both ends will switch to consistent paths when protection is needed.
Solution Approach 2:
The patent implements feedback by having the tail end node send back information about its selective receiving path to the head end node. This feedback mechanism allows the head end to know what path the tail end will use, enabling coordinated switching decisions that ensure path consistency between both ends.
2Reliability
If selective receiving paths are inconsistent between head end and tail end, then dual-ended protection switching can be implemented, but round-trip delay requirements cannot be met
Solution Approach 1:
The patent applies preliminary action by pre-coordinating the path selection between head end and tail end before actual failure occurs. By determining the selective receiving path at the tail end based on the head end's sending path in advance, the system ensures that both ends will switch to the same path simultaneously, minimizing round-trip delay.
3Reliability
If dual-ended switching with inconsistent paths is used, then protection capability is achieved, but network maintenance complexity increases
Solution Approach 1:
The patent implements feedback by establishing a communication mechanism where the tail end node informs the head end node about its selective receiving path selection. This feedback allows for coordinated switching decisions, making network maintenance easier by ensuring both ends switch consistently without requiring complex manual configuration.
Data Source
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AI summary
Embodiments of the present invention provide a 1+1 end-to-end bidirectional switching method, which implements a bidirectional switching function when a path is faulty and ensures that selective receiving paths are the same between a head end and a tail end, and therefore, requirements of a network application that imposes a stringent round-trip delay requirement are met and convenience is provided for daily maintenance of a network. The method includes: receiving, by a source node, candidate path information sent by a node that detects a fault; acquiring, by the source node, a first path according to the candidate path information, and switching a service to a data channel corresponding to the first path; and sending, by the source node, on the first path, information about the first path to a sink node, so that a node capable of 1+1 protection on the first path determines, according to the information about the first path, to switch the service to the data channel corresponding to the first path.