Port Extender Connectivity Tracking in Extended Bridges
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Solution Overview
Problem
Managing extended bridges is challenging due to the difficulty in tracking physical connections between port extender (PE) and controlling bridge (CB) units, especially with cascade trunks, as the master CB cannot distinguish individual ports within link aggregation groups, leading to manual, time-consuming, and error-prone cabling tracing in large-scale deployments.
Innovation Solution
Implementing port connectivity logic in PEs and CBs to automatically determine and store port-to-port connectivity information, allowing the master CB to aggregate and visualize this data through a command line interface (CLI) command, enabling users to view bridge topology and validate dynamic changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual cabling tracing is used to determine port connections, then connection accuracy can be achieved, but time consumption and operational complexity increase significantly
Solution Approach 1:
The system enables automated self-detection of port connections by having PEs autonomously send probe messages through cascade links and automatically record connectivity information in databases, eliminating the need for manual cable tracing while maintaining accurate connection tracking
Solution Approach 2:
The patent replaces manual mechanical cable tracing with an automated electronic probe message system, where digital messages traverse the physical connections and automatically map the topology, substituting human labor with automated electronic detection
2Loss of information
If the master CB aggregates connectivity information from all PEs, then comprehensive topology visibility is achieved, but system complexity and information management burden increase
Solution Approach 1:
The patent segments the connectivity information management by having each PE maintain its own local database of connections, while the master CB aggregates only summarized topology data, dividing the information management burden across multiple nodes rather than centralizing all detailed information
Solution Approach 2:
The system uses probe messages that carry connectivity information copies from one PE to another, allowing the master CB to reconstruct the complete topology through aggregated copies rather than requiring direct reporting of all connection details from every node
Data Source
AI summary
Techniques for determining port-to-port connectivity in an extended bridge are provided. According to one set of embodiments, a port extender (PE) of the extended bridge (e.g., a base PE) can build a local database comprising connectivity information for one or more physical cascade ports of the PE. This building can be based on one or more messages received from another PE in the extended bridge (e.g., a transit PE) that is directly connected to the PE. The PE can then transmit, at a time of joining the extended bridge, the connectivity information to a controlling bridge (CB) of the extended bridge for storage thereon.