Queue management with support for multicasts in an asynchronous transfer mode (ATM) switch
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
Nov 24, 1997
filing date -
Nov 24, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An ATM switch supporting multicast transmissions and efficient transmission of frames. A cell is received on a multicast connection and transmitted on several branches/ports. Instead of copying a multicast cell several times for each output branch, only one copy of each multicast cell is maintained. The cell order and the stored cell data form a physical queue. Several logical queues are maintained, one for each output branch. In one embodiment, linked lists are used to maintain the queues. A cell in the physical queue is deleted after all logical queues traverse that cell. A shared tail pointer is used for all the logical queues to minimize additional processing and memory requirements due to the usage of logical queues. The queues enable cells forming a frame to be buffered until the end of frame cell is received, which provides for efficient handling of frames.
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