Multi-chassis Topology Discovery via In-band Signaling
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Solution Overview
Problem
The installation of large routers, which are often modular and connected via numerous cables, is prone to errors due to the complexity of correctly matching chassis ports, leading to invalid cable connections.
Innovation Solution
A network device that includes logic to insert and extract topology messages into traffic, allowing it to determine the validity of cable connections and alert users or reconfigure itself to ensure correct operation, using in-band messages to verify and correct cable connections between modular chassis components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If modular chassis are connected via numerous cables to form large routers, then network capacity and scalability are improved, but installation complexity and error rate increase
Solution Approach 1:
The patent implements automatic feedback mechanisms where the network device monitors cable connections in real-time, detects invalid connections through topology messages, and triggers alerts or automatic reconfiguration. This closed-loop feedback system eliminates the need for manual verification of each cable connection in multi-chassis setups.
Solution Approach 2:
The system performs self-verification of cable connections by automatically inserting and processing topology messages through the physical connections. The device serves itself by detecting connection validity without external intervention, and can even perform automatic reconfiguration to correct invalid connections.
2Adaptability or versatility
If manual cable connection matching is used in modular chassis, then device flexibility is maintained, but installation errors increase
Solution Approach 1:
Automatic feedback mechanisms monitor cable connections in real-time, detecting invalid connections through topology messages and triggering alerts or automatic reconfiguration, eliminating manual verification errors.
Solution Approach 2:
The patent replaces manual mechanical cable matching with automated electronic verification using topology messages embedded in data traffic. The system uses in-band signaling to automatically identify and validate physical connections, substituting human operator actions with automated electronic detection.
3Reliability
If topology verification is performed continuously, then connection reliability is improved, but processing overhead increases
Solution Approach 1:
The system performs topology verification periodically rather than continuously, inserting topology messages at regular intervals defined by a counter mechanism. This periodic action maintains connection reliability while reducing processing overhead compared to continuous verification.
Solution Approach 2:
The patent uses partial verification by only checking connections when topology messages are inserted, rather than continuously monitoring all traffic. The counter-controlled insertion ensures sufficient verification frequency while minimizing processing overhead.
Data Source
AI summary
A multi-chassis network device may automatically detect whether cables connected between chassis devices are correctly inserted. The device may insert, into a first data stream output from a first port of the device, control information identifying the first port. The device may receive, from a second data stream received by the first port of the device, second control information identifying a second port, at another device connected to the device via a cable. The device may determine, based on the second control information, whether the connection of the first port to the second port, via the cable, is valid and cause, when the connection of the first port to the second port is determined to not be valid, the device to output an indication that the connection is not valid or to reconfigure the device to make the connection of the first port to the second port valid.