Random early detection algorithm using an indicator bit to detect congestion in a computer network
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United States of America Patent
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May 15, 2007
Grant Date -
N/A
app pub date -
Aug 2, 2001
filing date -
Aug 2, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A switching fabric sets a congestion indicator bit (EFCI bit) in an ATM cell if any queue through which the ATM cell passes is filled above a lower threshold. A Traffic Manager monitors the field of the EFCI bit as cells arrive at an output port of the switching fabric. The traffic manager periodically calculates the ratio of ATM cells having the EFCI congestion bit set to all ATM cells routed to a particular output port. The periodically calculated ratio is used as an input parameter to a Random Early Detection (RED) algorithm. The RED algorithm selects a cell for the switch fabric to drop, by use of a random selection method. The destination computer then does not receive the packet since cells forming part of the packet have been discarded.
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