D-Link DGS-1520 User Manual - Page 184

DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide 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, as shown below: Figure 5-66 Loopback Detection Window The fields that can be configured in Loopback Detection Global Settings are described below: Parameter Loopback Detection State Mode Enabled VLAN ID List Interval Trap State Action Mode Address Type Description Select to enable or disable loopback detection. By default, this option is disabled. Select the loopback detection mode. Options to choose from are Port-based and VLAN-based. Enter the VLAN ID for loop detection. This only takes effect when VLAN-based is selected in the Mode drop-down list. Enter the interval in seconds that the device will use to transmit Configuration Test Protocol (CTP) packets to detect a loopback event. The range is from 1 to 32767 seconds. By default, this value is 10 seconds. Select to enable or disable the loopback detection trap state. Select the action mode here. Option to choose from are: • Shutdown - Specifies to shut down the port in the port-based mode or block traffic on the specific VLAN in the VLAN-based mode when a loop has been detected. • None - Specifies not to shut down the port in the port-based mode or block traffic on the specific VLAN in the VLAN-based mode when a loop has been detected. Select the address type here. Options to choose from are Multicast and Broadcast. Click the Apply button to accept the changes made. The fields that can be configured in Loopback Detection Port Settings are described below: Parameter Unit From Port - To Port State Description Select the Switch unit that will be used for this configuration here. Select the appropriate port range used for the configuration here. Select this option to enable or disable the state of the port. 174