Multicast and unicast scheduling for a network device
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United States of America Patent
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Apr 14, 2009
Grant Date -
Jan 9, 2003
app pub date -
Sep 11, 2002
filing date -
May 14, 1999
priority date (Note) -
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Abstract
A method and apparatus are provided for scheduling unicast and multicast data in an input-queued network device. According to one aspect of the present invention, a combined schedule is created by pipelined staging of multicast and unicast scheduling. Multicast cells are scheduled for transmission among multiple interfaces of a crossbar by performing a multicast cell scheduling cycle for multiple classes of service that are supported by the network device. Then, unicast cells are scheduled for transmission among the interfaces at a lower priority than the previously scheduled multicast cells by performing a unicast cell scheduling cycle for the multiple classes of service using only those interfaces that remain unmatched after completion of the multicast cell scheduling cycle.
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