System and method for enhancement of Ethernet link loss forwarding
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United States of America Patent
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Apr 1, 2014
Grant Date -
Nov 22, 2012
app pub date -
Jul 27, 2012
filing date -
Aug 31, 2009
priority date (Note) -
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Abstract
A system and method provide enhanced link loss forwarding in an Ethernet system to determine link degradation and to selectively block and re-establish transport between a near end device and far end device based on a SONET connection between end devices and link status detection using local packets. When an excessive number of errors are detected in an Ethernet port, a device enters a Links Off mode from a Transport mode where Ethernet ports are turned off at both ends of a circuit associated with the errors. A Block Transport mode is then entered where local packets (e.g., OAM packets) are monitored to evaluate link quality (e.g., SONET bit error rate). Transport mode is re-established when acceptable link quality is achieved for a selected period of time.
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