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Digital network including early packet discard mechanism with adjustable threshold
| Details |
Inventors: Des Jardins, George Thomas; Sathaye, Shirish S.;
Assignee: FORE Systems, Inc. (Warrendale, PA)
Primary Examiner: Maung; Zami
Assistant Examiner: Najjar; Saleh
Attorney, Agent or Firm: Schwartz; Ansel M.
A computer network includes a plurality of routing nodes, each routing node being connected to selected ones of the other routing nodes and at least some of the routing nodes being connected to one of a plurality of packet sources or one of a plurality of packet destinations. Each routing node routes packets that are generated by the packet sources to respective ones of the packet destinations, each packet including a plurality of serially-transmitted cells. At least some of the routing nodes, in response to detection of a selected degree of congestion, enable an "early packet discard control arrangement," in which they discards cells which they receive which are related to packets for which they did not receive a cell prior to enabling the early packet discard control arrangement. The routing nodes periodically adjust the degree of congestion at which they will activate the early packet discard mechanism in relation to information corresponding to rates of reception and transmission of cells over a selected period of time prior thereto. |
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DETAILED DESCRIPTION The invention provides a new and improved digital network including an early packet discard mechanism with adjustable threshold, which enables the routing nodes to adjust the degree of congestion at which they will activate the early packet discard mechanism in relation to the cell traffic.
In brief summary, in one aspect the invention provides a computer network including a plurality of routing nodes, each routing node being connected to selected ones of the other routing nodes and at least some of the routing nodes being connected to one of a plurality of packet sources and/or one of a plurality of packet destinations.
Each routing node routes packets that are generated by the packet sources to respective ones of the packet destinations, each packet including a plurality of serially-transmitted cells.
At least some of the routing nodes, in response to detection of a selected degree of congestion, enable an "early packet discard control arrangement," in which they discards cells which they receive which are related to packets for which they did not receive a cell prior to enabling the early packet discard control arrangement.
The routing nodes periodically adjust the degree of congestion at which they will enable the early packet discard control arrangement in relation to information corresponding to rates of reception and transmission of cells over a selected period of time prior thereto.
In a further aspect, the invention provides a routing node for use in connection with a computer network.
The computer network includes a plurality of routing nodes for transferring packets, each packet including a plurality of serially-transmitted cells, generated by a plurality of packet sources to respective ones of a plurality of packet destinations.
The routing node comprises a buffer and a buffer control.
The buffer receives and buffers cells to be transmitted to other routing nodes in the network or to a packet destination.
The buffer control selectively enables the buffer to receive and buffer cells
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