Operation Manual – Port Basic ConfigurationH3C S3100 Series Ethernet Switches Chapter 1 Port Basic Configuration1-5messages to the terminal, and remove the corresponding MAC forwarding entry.After the loop is removed, the port will automatically resume the normal forwardingstate.z If the loopback port auto-shutdown function is enabled on the port, the system willshut down the port and send log messages to the terminal. After the loop isremoved, you need to use the undo shutdown command to bring up the port.Note:You cannot enable both the loopback port control function and the loopback portauto-shutdown function on a port. If you do so, the function configured later will takeeffect.1.1.6 Configuring Loopback Detection for Ethernet Port(s)Table 1-5 Configure loopback detection for Ethernet port(s)Operation Command RemarksEnter system view system-view —Enable loopbackdetection globallyloopback-detectionenableOptionalBy default, the global loopbackdetection function is enabled ifthe device boots with the defaultconfiguration file (config.def); ifthe device boots with nullconfiguration, this function isdisabled.Enable loopbackdetection on thespecified ports inbulkloopback-detectioninterface-list enableOptionalBy default, the loopbackdetection function is enabled onports if the device boots with thedefault configuration file(config.def); if the device bootswith null configuration, thisfunction is disabled.At present, you can configure theloopback detection for ports inbulk on the S3100-EI series(except the S3100-EPON-EIseries) switches onlySet the interval forperforming portloopback detectionloopback-detectioninterval-time timeOptionalThe default is 30 seconds.Enter Ethernet portviewinterface interface-typeinterface-number —
