Dynamic Root Bridge Priority for Ring Network Multicast
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Solution Overview
Problem
In ring network architectures, multicast services are interrupted when a link fault occurs on the uplink port of the access layer device connected to the aggregation layer device, especially when the access layer device is a root bridge, due to the inability of prior art to handle topology changes effectively.
Innovation Solution
Setting both access layer devices as root bridges with equal bridge priorities, allowing the first access layer device to reduce its bridge priority upon a link fault, calculate a new Root Port (RP) using the Spanning Tree Protocol (STP), and send a multicast Join packet through the RP, ensuring continuous multicast service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the access layer device is set as a root bridge in ring network architecture, then the multicast service can be properly implemented with RP binding mode, but when a link fault occurs on the uplink port, the entire multicast service is interrupted
Solution Approach 1:
The invention makes the root bridge role dynamic by allowing access layer devices to adjust their bridge priority based on link status. When a uplink link fails, the access layer device dynamically changes from root bridge mode to non-root bridge mode, enabling automatic adaptation to topology changes while maintaining multicast service continuity through alternative paths.
Solution Approach 2:
The invention changes the bridge priority parameter of the access layer device dynamically. When a link fault is detected, the device modifies its bridge priority value to exit root bridge status, triggering STP recalculation and RP reselection, thereby adapting to the new topology while preserving multicast service functionality.
2Ease of operation
If the access layer device uses fixed bridge priority as root bridge, then the RP binding mode works properly under normal conditions, but the device cannot adapt when link faults occur
Solution Approach 1:
The invention transforms the static bridge priority configuration into a dynamic one that automatically adjusts based on link status. The access layer device monitors its uplink connections and dynamically modifies its bridge priority to maintain optimal multicast service operation under varying network conditions, eliminating the need for manual reconfiguration.
Solution Approach 2:
The access layer device performs self-diagnosis and self-adjustment by monitoring its own link status and automatically modifying its bridge priority when faults are detected. This self-service mechanism enables the device to adapt to topology changes without external intervention, maintaining multicast service continuity autonomously.
Data Source
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AI summary
Embodiments of the present invention provide a method, an access layer device, and a system for implementing multicast in a ring network architecture. The ring network architecture includes a first aggregation layer device, a second aggregation layer device, a first access layer device connected to the first aggregation layer device, and a second access layer device connected to the second aggregation layer device. The first aggregation layer device is connected to the second aggregation layer device, and the first access layer device is connected to the second access layer device. The method includes: setting the first access layer device and the second access layer device as root bridges; and reducing a bridge priority of the first access layer device when a fault occurs on a link between the first aggregation layer device and the first access layer device, calculating a root port RP of the first access layer device through the Spanning Tree Protocol (STP), and sending a multicast Join packet through the RP. The present invention ensures that the entire multicast service is not interrupted.