Frame Transfer Apparatus Rate Control for Network Congestion
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Solution Overview
Problem
Frame transfer apparatuses experience congestion due to excessive copying of frames with unknown destination addresses, which affects the transfer of frames with known destination addresses, leading to network inefficiencies.
Innovation Solution
A frame transfer apparatus with a storage unit for address and port association, a receiving unit, a switch unit that copies frames when the destination address is unknown and controls the output rate, and a transmitting unit to manage frame transmission based on determined output ports and rate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frames with unknown destination addresses are copied and output from all ports (flooding), then the frame can reach its destination, but network congestion occurs and transfer of frames with known destination addresses is affected
Solution Approach 1:
The patent changes the parameter of frame output rate by controlling the copying rate of frames with unknown destination addresses. The rate control unit dynamically adjusts the copying rate based on current network conditions, transforming the fixed flooding behavior into a controllable parameter that adapts to network load, thereby resolving the contradiction between reliable frame delivery and network transfer efficiency
Solution Approach 2:
The patent introduces dynamic control into the frame copying process. The rate control unit continuously monitors network conditions and dynamically adjusts the copying rate of flooded frames, making the system adaptive rather than static. This dynamic adjustment allows the system to maintain frame delivery reliability while preventing network congestion under varying load conditions
2Reliability
If the copying rate of frames with unknown destination addresses is increased, then frame delivery reliability improves, but processing load and network congestion increase
Solution Approach 1:
The patent implements a feedback mechanism where the rate control unit monitors network conditions and frame copying rates, then adjusts the copying rate accordingly. This closed-loop control ensures that frame delivery reliability is maintained while preventing excessive processing load by continuously adapting the copying rate based on actual network state and processing capacity
Data Source
AI summary
There is provided a frame transfer apparatus, which includes: a storage unit configured to store an address and a port in association with the address; a receiving unit configured to receive a frame; a switch unit configured to determine an output port based on a destination address of a received frame; and a transmitting unit configured to transmit the received frame, from the output port determined by the switch unit, wherein the switch unit includes a copying unit configured to copy the received frame when the destination address of the received frame has not been stored in the storage unit, and a rate control unit configured to control an output rate of a frame to be copied.