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DES-3200-10/18/28/28F Layer 2 Ethernet Managed Switch User Manual
Loopback Detection Settings
The Loopback Detection function is used to detect the loop created by a specific port. This feature is used 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 detects CTP packets received from a port, it signifies a loop on the network. The
Switch will automatically block the port 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 pull-down
menu.
To view this window, click L2 Features > Loopback Detection Settings:
Figure 3 - 40. Loopback Detection Settings window
Parameter Description
State
Use the drop-down menu to enable or disable loopback detection. The default is
Disabled.
Interval (1-32767)
Set a loop-detect Interval between 1 and 32767 seconds. The default is 10 seconds.
Mode
This read-only field displays Port Based.
Recover Time
(0 or 60-1000000)
Time allowed (in seconds) for recovery when a loopback is detected. The Loop-detect
Recover Time can be set at 0 seconds, or 60 to 1000000 seconds. Entering 0 will
disable the Loopdetect Recover Time. The default is 60 seconds.
From Port
Use the drop-down menu to select a beginning port number.
To Port
Use the drop-down menu to select an ending port number.
State
Use the drop-down menu to toggle between Enabled and Disabled.
Click Apply to implement changes made.
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