System for setting congestion avoidance flag at intermediate node to reduce rates of transmission on selected end systems which utilizing above their allocated fair shares

  • US 5,675,742 A
  • Filed: 06/26/1995
  • Issued: 10/07/1997
  • Est. Priority Date: 04/22/1988
  • Status: Expired due to Term
First Claim
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1. In a network of end systems communicating by means of transmission and reception of digital information packets routed through at least one intermediate system, a method for indicating when the intermediate system is approaching a state of congestion, said method being performed at the intermediate system and comprising the steps of:

  • A. determining whether the intermediate system is in an overload condition characterized by operation of the intermediate system above an optimal operating level but below a congestion level;

    B. if the intermediate system is in the overload condition;

    i. selecting the end systems that are transmitting information packets at rates that are above their respective allocated fair shares; and

    ii. signaling one or more of the selected end systems by setting at the intermediate system a congestion avoidance flag in information packets routed through the intermediate system to one or more of the selected end systems.

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