Deferred queuing in a buffered switch
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United States of America Patent
Stats
-
Feb 19, 2013
Grant Date -
Oct 21, 2010
app pub date -
Jun 30, 2010
filing date -
Dec 19, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus is disclosed for temporarily deferring transmission of frames to a destination in a data switch. When a request for transmission of a frame to the destination port is received, the congestion status of that destination is determined. If the destination is congested, the frame is stored in a deferred queue. When the status of a destination changes from congested to non-congested, the deferred queue is examined to see if any deferred frames can now be forwarded to their destination. While examining the deferred queue, incoming frames are placed on a backup queue. When the deferred queue is fully analyzed, the backup queue is emptied by either sending those frames to their destination or storing the frames in the deferred queue. While examining the deferred queue, the congested states of the destinations are not allowed to change from congested to non-congested.
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