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Real-time bandwidth provisioning in a switching device

  • US 7,631,096 B1
  • Filed: 10/14/2003
  • Issued: 12/08/2009
  • Est. Priority Date: 10/11/2002
  • Status: Expired due to Fees
First Claim
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1. A bandwidth provisioning method based on one or more quality of service levels (QoS), defined by one or more policies governing the transmission of protocol data units through a plurality of switching devices comprising the steps of:

  • (a) appending an inter-switching device label comprising a timestamp to the protocol data unit (PDU) segment at a first switching device, the first switching device comprising a plurality of queues characterized by one or more QoS properties;

    (b) buffering the PDU segment in one of the plurality of queues;

    (c) conveying the PDU segment to a second switching device;

    (d) determining via a fragmentation module to parse the PDU into fragments based on priority queues associated with a different level of priority with a unique QoS, wherein a plurality of QoS policies are applied, the plurality of QoS policies including bandwidth requirements, maximum jitter, queue delay, transit delay, preference and frequency with which a packet is distributed to the switch fabric;

    (i) determining, using the timestamp, an observed delay for the PDU segment to propagate between the first switching device and the second switching device; and

    (ii) altering at least one of the one or more QoS properties from the second switching device depending on the observed delay.

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