Operation Manual – Port Basic ConfigurationH3C S5600 Series Ethernet Switches Chapter 1 Port Basic Configuration1-6To do... Use the command... RemarksEnter Ethernet portviewinterface interface-typeinterface-number —Enable loopbackdetection on aspecified portloopback-detectionenableRequiredBy default, port loopbackdetection is disabled.Enable loopback portcontrol on the trunk orhybrid portloopback-detectioncontrol enableOptionalBy default, loopback portcontrol is not enabled.Configure the systemto run loopbackdetection on all VLANsof the current trunk orhybrid portloopback-detectionper-vlan enableOptionalBy default, the system runsloopback detection only onthe default VLAN of thecurrent trunk or hybrid port.Caution:z To enable loopback detection on a specific port, you must use theloopback-detection enable command in both system view and the specific portview.z After you use the undo loopback-detection enable command in system view,loopback detection will be disabled on all ports.1.1.7 Enabling Loopback TestYou can configure the Ethernet port to run loopback test to check if it operates normally.The port running loopback test cannot forward data packets normally. The loopbacktest terminates automatically after a specific period.Follow these steps to enable loopback test:To do... Use the command... RemarksEnter system view system-view —Enter Ethernet port view interface interface-typeinterface-number —Configure the Ethernet port torun loopback test loopback { external | internal } Required
