Method and apparatus for implementing a quality of service policy in a data communications network
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United States of America Patent
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Mar 22, 2005
Issued Date -
N/A
app pub date -
Mar 18, 2003
filing date -
Dec 18, 1998
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Expired
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Abstract
A method and apparatus for implementing Quality of Service (QoS) policy in a data communications network. A content addressable memory (CAM) contains flow information for each active flow of packets passing through a given node of a data communications network. The CAM has associated with each entry a packet counter, a byte counter, a token bucket, and a contract value. Each flow is assigned one of a plurality of output queues and optionally at least one output threshold value. An access control list CAM (ACLCAM) contains masked flow information. The ACLCAM provides an index to internal token bucket counters and preconfigured contract values of an aggregate flow table which becomes affected by the packet statistics. In this way, flows are aggregated for assignment of output queues and thresholds, possible dropping, and possible modification of packets.
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