The value of tmnxOamEthCfmTrCtlRemoteMepId specifies the remote Maintenance association End Point Identifier (MEP ID) for the test. A non-zero unicast destination MAC address is required in each test frame sent for the test. The destination MAC address can be specified directly (using tmnxOamEthCfmTrCtlTgtMacAddr) or indirectly (using this object). Exactly one of tmnxOamEthCfmTrCtlTgtMacAddr and tmnxOamEthCfmTrCtlRemoteMepId must be assigned a non-default value. Otherwise, an attempt to administratively enable the test (using tmnxOamSaaCtlAdminStatus) will fail. Suppose this object is assigned a non-default value. Then, at the start of each test run, SROS reads TIMETRA-IEEE8021-CFM-MIB::tmnxDot1agCfmLearnedRmtMacAddr to find the destination MAC address to use for the test run. The following index values are used for the read: tmnxOamEthCfmTrCtlSrcMdIndex, tmnxOamEthCfmTrCtlSrcMaIndex, tmnxOamEthCfmTrCtlSrcMepId, tmnxOamEthCfmTrCtlRemoteMepId. If the search fails to find a destination MAC address, no test frames will be sent for the test run. The number of frames to be sent during a test run is configured using tmnxOamTrCtlProbesPerHop, tmnxOamTrCtlInitialTtl, and tmnxOamTrCtlMaxTtl. Configuring tmnxOamEthCfmTrCtlRemoteMepId (instead of tmnxOamEthCfmTrCtlDestMacAddr) has the following advantage: if the hardware hosting the test's far end is replaced (meaning a new destination MAC address is present), the test does not need to be reconfigured.