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Process definition for source route switching

  • US 6,137,797 A
  • Filed: 11/27/1996
  • Issued: 10/24/2000
  • Est. Priority Date: 11/27/1996
  • Status: Expired due to Fees
First Claim
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1. A Token Ring Switch for use to interconnect communications network including:

  • a switch fabric;

    a plurality of ports;

    a plurality of port modules interconnecting the plurality of ports to the switch fabric, with at least one of port module including a register for receiving a frame, and at least one look-up table including at least one address for each remote station accessible via another port of the switch along with the target Port of Exit (POE) tag and Bridge Number Lan ID for each remote source route bridge accessible via another port of the switch along with the target POE tag, means for identifying a source routed frame;

    state machine for analyzing the source routed frame and extracting a first expression identifying an external Source Route Bridge Path from which the frame was received and a second expression identifying an External Source Route Bridge Path for said frame; and

    state machine for using the first expression or second expression to access the look-up table and identify the Port of Exit (POE) to which the frame is to be routed via the switch fabric.

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