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Method and apparatus for discarding data packets

  • US 6,647,424 B1
  • Filed: 05/19/1999
  • Issued: 11/11/2003
  • Est. Priority Date: 05/20/1998
  • Status: Expired due to Term
First Claim
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1. A method for filtering a data packet comprising the steps of:

  • classifying an internal service class (ISC) to the data packet according to a classification criteria selected from the group comprising at least two of an ingress channel identifier, an IP source address, an IP destination address, a protocol, an options field, a type of service (TOS)/precedence field, source ports, destination ports, and TCP flags;

    adding a size value of the data packet to a data count for the ISC;

    comparing the ISC to a committed information rate (CIR);

    setting a drop preference bit (DP) for the data packet if the data count exceeds the CIR;

    setting a watermark indicator (WM) for the data packet responsive to a congestion level of a buffer memory;

    concatenating the ISC, DP, and WM into a key for a lookup into a configurable congestion clip table; and

    discarding the data packet responsive to the lookup into the configurable congestion clip table.

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