Method and device for controlling switching communicated network flow

Abstract

The invention discloses a method and a device for controlling switching communicated network flow. The method comprises the steps of: monitoring the lengths of a unicast virtual output queue and a multicast virtual output virtual queue in real time, and when the length of a certain queue exceeds a jamming threshold, generating a jamming indication signal, and adding a jamming identification on all cell heads of corresponding output ports; detecting in real time whether cells access the jamming queue, and if so, sending out a cell queue-accessing notification message; and judging whether the quantity of the cells accessing the jamming queue reaches a preset threshold or not according to the cell queue-accessing notification message, and if so, adding a link level fluid control effective indication signal on all the cell heads output by the corresponding output ports. The device comprises a jamming detection module and a back pressure module. The invention solves the problem of unreasonable solutions to jamming of unicast / multicast communication modes in the prior art.

Description

technical field [0001] The invention relates to the technical field of data exchange, in particular to a method and device for flow control of an exchange network. Background technique [0002] The switching network is the core part of bandwidth switching devices (such as switches / routers). In order to solve the congestion of the switching network traffic and avoid the on-chip output buffer overflow problem caused by the switching network congestion, flow control technology is usually used to control the switching network traffic. The basic ideas of the existing flow control mechanism include the following two types: [0003] (1) If the switching network is congested, its output port sends control cells to notify the switching access chip to reduce the amount of cells sent to the switching network to alleviate congestion. [0004] (2) Obtain the status and egress traffic information of each sending end of the switching network through the external line card of the switchin...

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Problems solved by technology

[0010] The present invention provides a method and device for flow control of a switching network, which are used to solve the problem of congestion in the two communication modes of unicast and multicast in the prior art, which is unreasonable and cannot guarantee the reliability of the flow control response The accuracy of performance and flow control, and the back pressure is slow, so the risk of buffer overflow caused by congestion cannot be avoided.

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