Autonegotiation Rate Limiting for Downstream Capacity Mismatch
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Solution Overview
Problem
Conventional autonegotiation processes often result in data transmission rate mismatches between networks with different protocols, leading to inefficient use of bandwidth and potential data loss, especially when converting between Ethernet and SONET networks.
Innovation Solution
A method and system that dynamically adjust data transfer rates by determining the provisioned rate of the secondary network and sending a configuration message to limit the transfer rate to match the downstream capacity, ensuring data is transmitted at the maximum rate supported by the secondary network, thereby preventing excess data loss and optimizing bandwidth utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If autonegotiation selects the highest performance transmission mode supported by both devices, then data transfer rate between the two devices is maximized, but the transmission parameters may be incompatible with downstream networks causing data loss and inefficient network performance
Solution Approach 1:
The system performs preliminary detection of downstream network capabilities before finalizing the data transfer rate negotiation. The second network device detects the capabilities of the third network device and determines the maximum supported data transfer rate in advance, then communicates this information to the first network device through an extended autonegotiation process, preventing incompatibility issues before they occur
Solution Approach 2:
The system implements a feedback mechanism where the second network device provides information about downstream network capabilities back to the first network device. This feedback loop allows the upstream devices to adjust their negotiation parameters based on actual downstream constraints, ensuring compatibility while maximizing throughput
2Reliability
If the data transfer rate is limited to match downstream capacity, then network compatibility and data loss prevention are improved, but bandwidth utilization between the first and second devices is reduced
Solution Approach 1:
The system dynamically adjusts the data transfer rate based on real-time network conditions and capability information. Rather than using a static rate limit, the autonegotiation process continuously exchanges capability information between devices, allowing the system to adapt to changing network conditions and maximize bandwidth utilization within safe operational parameters
Solution Approach 2:
The system changes the negotiation parameters by extending the autonegotiation process to include downstream capability information. Instead of negotiating only based on direct link capabilities, the system incorporates additional parameters about downstream network constraints, allowing optimization of the transfer rate parameter to balance compatibility and utilization
3Ease of operation
If conventional autonegotiation is used without knowledge of downstream capabilities, then the negotiation process is simple and fast, but transmission parameters may mismatch with downstream network protocols
Solution Approach 1:
The system enhances the autonegotiation process to serve multiple functions: it not only negotiates direct link capabilities but also communicates downstream network constraints and protocol requirements. This multi-functional approach allows a single negotiation process to ensure both local link optimization and downstream compatibility
Data Source
AI summary
An improved autonegotiation approach includes determining that a negotiated rate between a first network device and a second network device exceeds data transfer capacity over a network path downstream of the second network device. In response, a configuration message is generated and transmitted to the first network device. When received by the first network device, the configuration message causes the first network device to limit data transfer between the first network device and the second network device to no more than the downstream data transfer capacity.