Packet switching
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United States of America Patent
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Oct 17, 2006
Grant Date -
May 2, 2002
app pub date -
May 25, 2001
filing date -
May 25, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method for cell level scheduling for handling multicast traffic in routing devices, such as cross-bar switches having, a plurality of ingress line interface cards (LICs), a plurality of egress LICs, a cross-bar and a controller, multicast and unicast data traffic passes from the ingress LICs via the cross-bar to the egress LICs. A given multicast data packet is sent from a given ingress LIC to a predetermined set of egress LICs known as the fanout of the given packet. Each ingress LIC has an associated rate of send opportunities. The method allows multicast send opportunities to be spread as evenly as possible over cell periods, by invoking a conventional unicast scheduling scheme when one or more multicast send opportunities are present. The schedule is filled out with the fanouts of multicast packets in accordance with the send priority associated with the respective ingress LICs upon which each of the respective multicast packets is queued.
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