Method and apparatus for controlling data congestion in a frame relay/ATM internetworking system
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United States of America Patent
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Dec 2, 2003
Grant Date -
N/A
app pub date -
Jul 30, 1999
filing date -
Jul 30, 1999
priority date (Note) -
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Abstract
A method and apparatus for controlling data congestion in a frame relay/ATM internetworking system is presented. In one embodiment, received frame relay frames are monitored in an internetworking switch to detect an indication, of congestion. When an indication of congestion is detected, the egress traffic provided to the source of the congestion indication is reduced, which may lead to local congestion in the internetworking switch. When congestion within the internetworking switch has arisen and a resource management cell is received along an ATM ingress path, an ATM, backward resource management cell is generated having a set congestion indication bit that informs additional ATM nodes of the congestion. In another embodiment, ATM cells are received in an internetworking switch and monitored to detect an indication of congestion. When an indication of congestion is detected, egress traffic is reduced to the source of the indication, and when local congestion results in the internetworking switch as a result, a subsequent frame relay frame is generated that includes a backward explicit congestion notification (BECN) indication. The set BECN indication informs additional frame relay portions of the network of the congestion indication relayed by the ATM cells.
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