Backpressure mechanism for a network device
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United States of America Patent
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Aug 3, 2004
Issued Date -
N/A
app pub date -
Sep 4, 2002
filing date -
May 14, 1999
priority date (Note) -
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status (Latency Note)
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Abstract
A method and apparatus are provided for scheduling multicast data in an input-queued network device. A fabric arbiter receives a transmit request associated with multiple input ports. The transmit request identifies those of the output ports to which pending multicast cells are ready to be transmitted, if any. The fabric arbiter receives a backpressure signal from a backpressuring output port. Then, based upon the backpressure signal the fabric arbiter schedules multicast cells for transmission across the fabric. If the size of a multicast queue exceeds a predetermined threshold, then the fabric arbiter ignores the backpressure signal and causes the head-of-line multicast cell from the multicast queue to be transferred to the backpressuring output port. Otherwise, the fabric arbiter prevents multicast cells from being transferred to the backpressuring output port by masking requests destined for the backpressuring output port thereby removing the backpressuring output port from consideration during multicast scheduling.
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