Switching system and switching method based on length variable packet

Abstract

The system includes following parts: input port in use for inputting information packet; destination port in use for outputting information packet; supporting multiple information channels, exchange unit is in use for receiving information packet input from an input port through information channel or transferring information packet between exchange units, and processing information packets received from exchange; setup up at each input port and destination port, memory unit is in use for building buffer queues at each input port for differentiating destination ports based on number of destination ports; setup up at each destination port, priority buffer queues for differentiating priorities based on number of supporting priority; connection bus in use for connection among input ports, memory units, exchange units and destination ports. The invention supports process of packet in variable length, and is possible to support dispatch algorithm in high performance if speed is doubled.

Description

technical field [0001] The invention relates to the field of communication, in particular to the field of information exchange applied to core routers. Background technique [0002] As the key technology of routers, switching system has always attracted much attention. At present, the relatively mature switching systems mainly include: output queuing switching system, input queuing switching system, combined input and output queuing switching system and parallel distributed queuing switching system. At present, the switching units used in these switching systems are generally implemented by crossbars in engineering, so only fixed-length packets are supported. The so-called fixed-length packet refers to an information packet whose length is a fixed constant value. Relatively speaking, a variable-length packet refers to an information packet whose length is a variable value. [0003] The output queuing switching system means that all buffer queues are placed on the destinat...

AI Technical Summary

Problems solved by technology

The disadvantage is that the scheduling strategy based on the input queuing switching system can only achieve coarse-grained priority services, and its delay and delay jitter characteristics are not as good as the scheduling algorithm based on the output queuing switching system

The defect of the switching system of parallel distributed queuing is that the parallel processing of multiple planes will lead to the complexity of control management, and because of the problem of packet disorder caused by parallel processing, there is currently no easy-to-engineer solution to the problem of disorder

However, when using fixed-length information packet processing, it is necessary to increase the overhead of fragmentation and reassembly in the router.

Moreover, since the length of the packet after slicing is small, the proportion of the overhead of the internal packet header increases, and the processing efficiency is low.

[0010] 2. The existing technology cannot meet the requirements of speed, performance and complexity at the same time

The joint input and output queuing and switching system is only in the theoretical research stage, and the complexity of its scheduling algorithm is too high, which is difficult to realize in engineering

Parallel distributed queuing switching system multi-plane processing will lead to complex control management, and the solution to the out-of-sequence problem requires additional complex overhead

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