NODE FAILURE DETECTION FOR DISTRIBUTED LINEAR PROTECTION

摘要

A system includes a network element communicatively coupled to another network element through an intraportal link forming a node portal. The network element is communicatively coupled to a source network element within a network attached to the node portal. The network element is configured to monitor a protect path for an automatic protection switching (“APS”) message from the source network element, determine that the APS message has been received, monitor an intraportal link for an expected message from the other network element, determine that the expected message has not been received, monitor integrity of the intraportal link, determine that the intraportal link has failed and determine that the other network element has failed based upon determining that that the APS message has been received, that the expected message has not been received, and that the intraportal link has failed.

主权项

1. A method for linear protection, comprising, for a first network element communicatively coupled to a second network element, the first network element and the second network element included in a first node portal located at the edge of a first administrative network domain:
monitoring a protect path for an automatic protection switching (“APS”) message from a third network element included within a network attached to the first node portal, the APS message indicating a failure of a working path between the second network element and the third network element; determining that the APS message has been received; monitoring an intraportal link for a message from the second network element; determining that the message from the second network element has not been received; monitoring integrity of the intraportal link; determining that the intraportal link has failed; and determining that the second network element has failed based upon determining that that the APS message has been received, that the message from the second network element has not been received, and that the intraportal link has failed.