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Running a Y.1731 Link Trace


Use this procedure to run a Y.1731 link trace from one UNI to another UNI.


  • MEPs and MIPs have been configured for the service.

A Y.1731 link trace request at the local MEP causes a Link Trace Message (LTM) to be sent to the remote MEP. All MIPs between the local and remote MEPs respond to the LTM with a Link Trace Reply (LTR). PSM uses information from the LTRs to display the path between the two endpoints.

  1. In the Network tree view, click on the Ethernet service where you want to run the link trace.

    The Ethernet service appears in the Topology window.

  2. Right-click the UNI port that you want to be the initiator, select CFM Tests >Linktrace to , and pick the responder port from the drop down list. If you want the responder port to be shown with its IP address in this list, see Setting device display options.

    The initiator UNI port must be on a BTI7000 Series, a BTI800 Series, or a BTI718E device. The responder UNI port can be a port on any compliant device.

    After the link trace is finished, the path between the two UNIs is highlighted.


    The link trace might take some time to complete. You can watch its progress in the View >Server >Tasks window.

  3. To clear the highlighting of the path, right-click the background in the Topology window and select Clear Highlighting.