Starting LT

Perform loopback trace for the Ethernet service without interrupting the service to check the connectivity of the service and thus to locate and rectify the fault. Compared with the LB test, the link trace (LT) test provides enhanced fault locating capability. That is, the faulty network segment can be located the first time in the LT test.

Navigation Path

Starting the LT test for the Ethernet service OAM management, E-Line service, E-LAN service service requires information in this interface.

For RTN NEs, in the NE Explorer, right-click the NE and choose Configuration > Ethernet OAM Management > Ethernet Service OAM Management. Then, choose OAM > Start LT.
For RTN NEs, in the NE Explorer, right-click the NE and choose Configuration > Ethernet Service Management > E-Line Service. Then, click the MEP Point tab and choose OAM > Start LT.
For RTN NEs, in the NE Explorer, right-click the NE and choose Configuration > Ethernet Service Management > E-LAN Service. Then, click the MEP Point tab and choose OAM > Start LT.

Buttons

Button	Description
Start Test	Start the LT test.

Parameters

**Table 1** Descriptions of the parameters for Starting LT
Field	Value	Description
Maintenance Domain Name	8 bytes	Display the name of the maintenance domain.
Maintenance Association Name	8 bytes	Display the name of the maintenance association.
Source Maintenance Point ID	Example: 5	Set the source maintenance point for the LT test. The source maintenance point starts the LT test, only the MEP can be set to the source maintenance point.
Destination Maintenance Point ID	Example: 5	Set the source maintenance point for the LT test. Only the MEP ID can be set to the Destination Maintenance Point ID.
Destination Maintenance Point MAC Address	Example: 1A-2B-3C-4D-5E-6F	Set the destination maintenance point MAC address.
Destination Maintenance Point ID/MAC	Example: 1A-2B-3C-4D-5E-6F	Display the sink maintenance point for the LT test.
Response Maintenance Point ID/MAC	Example: 1A-2B-3C-4D-5E-6F	Display the response maintenance point for the LT test.
Hop Count	Example: 3	Display the count of hops for the LT test. The hop count indicates the number of intermediate NEs between the source NE and sink NE.
Test Result	Character string	Display the test result.