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OAM: Fault Isolation (LTM, LTR)
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The source node initiates a linktrace message (LTM), and each intermediate node along the path forwards the LTM toward the destination node along the path forwards the LTM toward the destination node and sends a linktrace reply (LTR) back to the source. This serves two purposes. Under normal conditions, it allows the operator to determine the path used by the service through the network. Under fault conditions, it enables the operator to isolate the fault location without making a site visit.
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If LB (Loopback) fails, then issue LTM (Linktrace Message [L2 Trace Route]) with the "target Remote Side MAC address".
If LT (Linktrace) fails and check the last LTR (Linktrace Reply) Message to isolate the fault node.
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