D-Link DGS-1100-16 Reference Manual page 57

The fields that can be configured for Loopback Detection Global Settings are described below:
Parameter
Loopback Detection
Time Interval
Recover Time
Loopback Detection Trap
Click the Apply button to accept the changes made.
The fields that can be configured for Loopback Detection Port Settings are described below:
Parameter
From Port / To Port
State
Click the Apply button to accept the changes made.
Note: If Spanning Tree protocol is used, loopback detection will not be available. If Loopback
Detection is enabled, the Spanning Tree protocol will not be available.
Description
Select to enable or disable loopback detection. The default is
Disabled.
Set a Loop detection Interval between 1 and 32767 seconds.
The default is 10 seconds.
Time allowed (in seconds) for recovery when a Loopback is
detected. The Loop Detection Recover Time can be set at 0
seconds, or 60 to 1000000 seconds. Entering 0 will disable
the Loop Detection Recover Time. The default is 60 seconds.
Select to enable or disable the loopback detection trap state.
Description
Select the appropriate port range used for the configuration
here.
Select this option to enable or disable the state of the port.
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D-Link DGS-1100 Series Switch User Manual