Patent ID: 6647424
Filing Date: 2003-11-11
Classification: H04L

Abstract:
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.