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DGS-1520 Series Gigabit Ethernet Smart Managed Switch Web UI Reference Guide
174
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 Description
Loopback Detection State
Select to enable or disable loopback detection. By default, this option is disabled.
Mode Select the loopback detection mode. Options to choose from are Port-based and
VLAN-based.
Enabled VLAN ID List Enter the VLAN ID for loop detection. This only takes effect when VLAN-based is
selected in the Mode drop-down list.
Interval
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.
Trap State
Select to enable or disable the loopback detection trap state.
Action Mode
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.
Address Type 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 Description
Unit
Select the Switch unit that will be used for this configuration here.
From Port - To Port
Select the appropriate port range used for the configuration here.
State
Select this option to enable or disable the state of the port.
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