Operation Manual – Ethernet Port Loopback DetectionH3C S9500 Series Routing Switches Chapter 1 Ethernet Port Loopback Detection1-1Chapter 1 Ethernet Port Loopback DetectionWhen configuring Ethernet port loopback detection, go to these sections for informationyou are interested in:z Overviewz Configuring the Loopback Detection Functionz Displaying and Maintaining Loopback Detection1.1 OverviewYou may configure the system to regularly inspect ports for loop. This involves enablingport loopback detection and enabling loopback detection in VLANs (up to 800), andsetting the detection interval. Once detecting loopback on a port, the switch sends atrap and shut down the port depending on your configuration.Caution:z The Ethernet port loopback detection and STP functions are mutually exclusive.z XP4B and XP4CA cards do not support the Ethernet port loopback detectionfunction.1.2 Configuring the Loopback Detection FunctionFollow these steps to configure the loopback detection function:To do … Use the command … RemarksEther system view system-view —Enable global loopbackdetectionloopback-detectionenableRequiredBy default, the global portloopback detectionfunction is disabled.Enable loopbackdetection in the specifiedVLAN(s)loopback-detectionenable vlan { vlanlist |all }RequiredSet the interval fordetecting externalloopbackloopback-detectioninterval-time time Optional
