D-Link DGS-3200-10 Product Manual - Page 114

xStack® DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch Loopback Detection Settings The L oopback Det ection function i s u sed to det ect t he l oop c reated by a specific port. T his feature is u sed to temporarily shutdown a port on the Switch when a CTP (Configuration Testing Protocol) packet has been looped back to the Switch. When the Switch de tects CTP packets receive d from a port or a VL AN, t his signifies a loop on th e network. Th e Switch will automatically block the port or the VLAN and send an alert to the administrator. The Loopback Detection port will restart (change to discarding state) when the Loopback Detection Recover Time times out. The Loopback Detection function can be implemented on a range of ports at a time. The user may enable or disable this function using the drop-down menu. To view the following window, click L2 Features > Loopback Detection Settings: Figure 3 - 40. Loopback Detection Settings window (Port-based) Figure 3 - 41. Loopback Detection Settings window (VLAN-based) The following parameters may be viewed or modified: Parameter Description LBD State Use the drop-down menu to enable or disable loopback detection. The default is Disabled. Mode Use the drop-down menu to toggle between Port Based and VLAN Based. 101