Methods and apparatus for provisioning connection oriented, quality of service capabilities and services
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United States of America Patent
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Issued Date -
Apr 28, 2005
app pub date -
Aug 10, 2004
filing date -
Aug 11, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention describes a system for providing quality of service (QoS) features in communications switching devices and routers. The QoS provided by this system need not be intrinsic to the communication protocols being transported through the network. Preferred embodiments also generate statistics with the granularity of the QoS. The system can be implemented in a single application-specific integrated circuit (ASIC), in a chassis-based switch or router, or in a more general distributed architecture. The system architecture is a virtual output queued (VOQed) crossbar. The administrator establishes policies for port pairs within the switch, and optionally with finer granularity. Frames are directed to unique VOQs based on both policy and protocol criteria. Policies are implemented by means of a scheduling engine that allocates time slices (minimum units of crossbar access).
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