Packet switching method, device and system

Abstract

The invention discloses a method, a device and a system for packet switching, and belongs to the field of packet switching. The method comprises the following steps: receiving an original switching request sent by an uplink switching module; copying the original switching request to obtain a plurality of switching requests, arbitrating the switching requests according to the states of ports connected to a vertical-horizontal cross switching module and a downlink switching module, outputting the obtained arbitration result to the uplink switching module; receiving cells sent by the uplink switching module; and according to the arbitration result, forwarding the cells to the downlink switching module. The device comprises an input request processing module, an arbitration module and an output permission processing module. The method, the device and the system have the advantages of realizing the intercommunication between the packets, expanding the number of ports of the packet switching system, enhancing the switching capacity, simultaneously being compatible with the original SM system, and reducing the cost of the switching system, along with strong expandability.

Description

technical field [0001] The present invention relates to the field of packet switching, in particular to a packet switching method, device and system. Background technique [0002] With the development of network technology, the demand for switching capacity of switching chips is increasing, and there is also a higher demand for switching chip application flexibility and multi-scenario applications. In the prior art, there are generally two ways to improve the switching capacity of the switching chip. The first is to increase the speed of the port to achieve a higher switching capacity; the second is to increase the number of ports of the switching chip to achieve a higher switching capacity. [0003] When increasing the switching capacity by increasing the port rate, it often leads to incompatibility between the network chip and the switching chip. It is necessary to increase the port rate of the switching chip based on the rate of the network chip, which limits the improvem...

AI Technical Summary

Problems solved by technology

[0007] When increasing the switching capacity by increasing the number of SC ports, the bit width requested by the SMi cell should be correspondingly increased to be consistent with the number of outgoing ports of the SC. For this reason, the format of the SM cell needs to be modified, resulting in an increase in the overhead of the cell. Compatible with existing SM chips, affecting product development;

[0008] When the capacity of the SM chips connected to the SC is not equal, in order to realize the wire-speed intercommunication between the SMs, it is necessary to increase the number of ports connected between the small-capacity SMs and the SC, so that the number of ports connected to all SMs and SCs in the system is equal to that of the system The number of ports connected to the medium and maximum capacity SM and SC is equal, which increases the power consumption and area of ​​the SM chip, thereby increasing the cost of the chip

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