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Backward congestion notification

Image Number 16 for United States Patent #8121038.

In one embodiment, an apparatus comprises a network interface system having at least one input port configured for receiving frames and a logic system comprising at least one logic device. The logic system may be configured to perform the following functions: determining a source address and a destination address of a frame received at an ingress port; calculating a flow hash based at least upon the source address and the destination address; forming a congestion management ("CM") tag that includes the flow hash; inserting the CM tag in the frame; and forwarding the frame to the destination address.

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