Multi-Ring Ethernet Logic Area Link Unblocking
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Solution Overview
Problem
Multi-ring Ethernet networks face network storms and reduced anti-fault capabilities due to the unblocking of multiple ring protecting links when a shared path fails, leading to 'super loop' formation.
Innovation Solution
The method involves dividing the multi-ring Ethernet into logic areas, where each link belongs to one or more areas with unique priorities, and at most one ring protecting link is unblocked when a link fails, ensuring that the ring protecting link and the failed link are in the same logic area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple ring protecting links are unblocked when a shared path fails, then network connectivity is restored, but super loop formation occurs causing network storm
Solution Approach 1:
The patent divides the multi-ring Ethernet network into multiple logic areas, where each logic area independently manages its ring protecting links. When a link fails, only the ring protecting link within the same logic area is unblocked, preventing cross-area super loops while maintaining connectivity restoration within each logic area.
Solution Approach 2:
The patent introduces logic area boundaries as intermediaries that control the unblocking behavior of ring protecting links. The logic area structure acts as a mediator that limits the scope of link unblocking to prevent harmful super loops while still allowing necessary connectivity restoration.
2Object-generated harmful factors
If ring protecting links are blocked to prevent closed loops, then network storm is prevented, but network convergence speed decreases
Solution Approach 1:
The patent applies different blocking strategies to different logic areas based on local conditions. Each logic area independently determines when to block or unblock its ring protecting links, allowing fast convergence within each logic area while preventing network storms through coordinated logic area management.
Data Source
AI summary
A method and a system for preventing a network storm from presenting in a multi-ring Ethernet, the method comprises: when a link in the multi-ring Ethernet is failed, at most one ring protecting link is unblocked, the ring protecting link and the failed link being in a same logic area. Wherein each link in the multi-ring Ethernet belongs uniquely to one logic area, when a link in the multi-ring Ethernet is failed, a master node of a logic area to which the failed link belongs unblocks a ring protecting link; or each link in the multi-ring Ethernet respectively belongs to one or more logic areas, each logic area is set with a priority, when a link in the multi-ring Ethernet is failed, the ring protecting link of one logic area which contains the failed link and has a highest priority is unblocked by the master node of the logic area.