DIS-200G Series Industrial Gigabit Ethernet Smart Managed Switch
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Loopback Detection
The Loopback Detection (LBD) function is used to detect the loop created by a specific port. This feature
is used to temporarily shut down a port on the Switch when a CTP (Configuration Testing Protocol) packet
has been looped back to the Switch. When the Switch detects CTP packets received from a port, this
signifies a loop on the network. The Switch will automatically block the port and send an alert to the
administrator. 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:
The fields that can be configured for
Loopback Detection Global Settings
are described below:
Parameter
Description
Loopback Detection
Select to enable or disable loopback detection. The default is
Disabled.
Time Interval
Enter the interval in seconds that the device will transmit all the
CTP (Configuration Test Protocol) packets to detect a loop-back
event.The valid range is from 1 to 32767 seconds. The default
setting is 10 seconds.
Recover Time
Enter the interval in seconds that the port will re-open if the port is
in loop state. The valid range is from 60 to 1000000 seconds. The
value 0 will block port forever until the switch next boot up. The
default setting is 60 seconds.
Loopback Detection Trap
Select to enable or disable the loopback detection trap state.
Click the
Apply
button to accept the changes made.
The fields that can be configured for
Loopback Detection Port Settings
are described below:
Parameter
Description
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.
Click the
Apply
button to accept the changes made.
Figure 6-47 Loopback Detection window
