Switch fabric traffic control realization method, switch equipment and system
An implementation method and switching network technology are applied in the field of switching network flow control implementation methods, switching equipment and systems, and can solve problems such as increasing the burden on the switching network and occupying the bandwidth of the switching network, and achieve the effect of reducing the amount of information and improving the efficiency of data processing.
Active Publication Date: 2013-11-06
HUAWEI TECH CO LTD
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Problems solved by technology
[0005] In the prior art, sending flow control information from the output port of the switching network to the input port needs to occupy the bandwidth of the switching network, thus increasing the burden on the switching network
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[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0028] When a network device with a switching network function forwards a message, it needs to divide the message into multiple cells of fixed length. Different cells of the same message are scheduled on the same input port, and one cell is scheduled in one time slot. The same input port can maintain cells with messages destined for multiple output ports. The destination output ports to which the cells belonging to the same message need to be switched are the...
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The embodiments of the present invention relate to a method for implementing flow control in a switch fabric, a switching device, and a switching system. The method includes: sending, by each input port, request information to a destination output port where no packet congestion occurs; according to respective back pressure information, determining, by the destination output port which receives the request information, whether to return grant information to each input port to establish a matching relationship between each input port and the destination output port which returns the grant information; according to the matching relationship, scheduling, by each input port, a cell to a destination output port that is matched with each input port. Through the embodiments of the present invention, quantity of information transmitted between an input port and an output port is reduced, the design of the switch fabric is simplified, and data processing efficiency in the switch fabric is improved. At the same time, a problem of queue head of line blocking is solved by filtering a destination port where congestion occurs, so that performance of the switch fabric is improved.
Description
technical field [0001] Embodiments of the present invention relate to the technical field of communications, in particular, a method for implementing flow control in a switching network, switching equipment and a system. Background technique [0002] In the Switch Fabric of Combined Input-Output Queued (CIOQ) architecture, the variable-length packet (Packet) received by the line card (Line Card) is cut into fixed-length Cell buffering forms a queue at the input end, and N (N is a positive integer) unicast virtual output queue (Virtual Output Queue, VOQ for short) is set at the input end, and k (k is a positive integer, and 1≤ k≤2N)) multicast virtual output queues. The queue scheduling time is divided into time slots of fixed length. In one time slot, an input port can send at most one cell, and an output port can receive at most one cell. If multiple input ports need to send data to the same output port at the same time in a time slot, a port conflict will occur. [0003...
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IPC IPC(8): H04L12/70H04L49/111
CPCH04L47/26H04L49/552H04L49/3027H04L47/12H04L49/506H04L47/267
Inventor 孙团会李德丰苏皓曹爱娟宋健
Owner HUAWEI TECH CO LTD