1-5To do… Use the command… RemarksEnter system view system-view —Enter Ethernet port or ONU portviewinterface interface-typeinterface-number —Configurephysical-link-down-statechange suppression timelink-delay delay-time RequiredDisabled by defaultFollow these steps to configure the suppression time of physical-link-up-state changes on a port :To do… Use the command… RemarksEnter system view system-view —Enter Ethernet port or ONU portviewinterface interface-typeinterface-number —Configurephysical-link-up-state changesuppression time.link-delay delay-time mode up RequiredDisabled by defaultz The link-delay mode up command and the link-delay command are mutually exclusive with eachother on a port. When both commands are configured on a port, the one that is configured earlier isdisabled.z The link-delay command cannot take effect on ports that are manually disabled using the shutdowncommand.Configuring Loopback Testing on an Ethernet PortYou can enable loopback testing to check whether the Ethernet port functions properly. Note that nodata packets can be forwarded during the testing. Loopback testing falls into the following twocategories:z Internal loopback testing, which is performed within switching chips to test the functions related tothe Ethernet ports.z External loopback testing, which is used to test the hardware functions of an Ethernet port. Toperform external loopback testing on an Ethernet port, you need to install a loopback plug on theEthernet port. In this case, packets sent from the port are received by the same port.Follow these steps to enable Ethernet port loopback testing:To do… Use the command… RemarksEnter system view system-view —Enter Ethernet port or ONU portviewinterface interface-typeinterface-number —Enable loopback testing loopback { external |internal }OptionalDisabled by default.
