1-9Enabling OAM Remote LoopbackAfter enabling OAM remote loopback on a port, you can send loopback frames from the port to a remoteport and then observe how many of these loopback frames are returned. In this way, you can calculatethe packet loss ratio on the link, thus evaluating the link performance.Follow these steps to enable Ethernet OAM remote loopback:To do… Use the command… RemarksEnter system view System-view —Enter Ethernet port view interface interface-typeinterface-number —Enable Ethernet OAM remoteloopback oam loopback RequiredDisabled by default.Because enabling Ethernet OAM remote loopback impacts other services, use this function withcaution.z Ethernet OAM remote loopback is available only after the Ethernet OAM connection is establishedand can be performed only by the Ethernet OAM entities operating in active Ethernet OAM mode.z Remote loopback is available only on full-duplex links that support remote loopback at both ends.z Ethernet OAM remote loopback needs the support of the peer hardware.z Enabling Ethernet OAM remote loopback interrupts data communications. After Ethernet OAMremote loopback is disabled, all the ports involved will shut down and then come up. Ethernet OAMremote loopback is disabled when you execute the undo oam enable command to disableEthernet OAM, when you execute the undo oam loopback command to disable Ethernet OAMremote loopback, or when the Ethernet OAM connection times out.z Ethernet OAM remote loopback is only applicable to individual links. It is not applicable to linkaggregation member ports. In addition, you cannot assign ports where Ethernet OAM remoteloopback is being performed to link aggregation groups. For more information about linkaggregation groups, refer to Link Aggregation Operation.z Enabling internal loopback test on a port in remote loopback test can terminate the remoteloopback test. For more information about loopback test, refer to Port Basic ConfigurationOperation
