Loopback Detection Settings - D-Link DGS-3700-12 User Manual

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Loopback Detection Settings

The Loopback Detection 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 loop detecting packet has been looped back to the switch. When
the Switch detects that these packets are received from a port or a VLAN, it signifies a loop on the network. The
Switch will automatically block the port or the VLAN 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 Security > Loopback Detection Settings, as shown below:
The following parameters can be configured:
Parameter
Loopback Detection
State
Mode
Interval (1-32767)
Trap Status
Recover Time
(0 or 60-1000000)
From Port /To Port
State
DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet User Manual
Figure 8- 40 Loopback Detection Settings window
Description
Used to Enable or Disable loopback detection. The default is Disabled.
Use the drop-down menu to toggle between Port Based and VLAN Based.
Set a Loopdetect Interval between 1 and 32767 seconds. The default is 10 seconds.
Select the trap status; choose None, Loop Detected, Loop Cleared or Both.
Time allowed (in seconds) for recovery when a Loopback is detected. The Loopdetect
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.
Use the drop-down menu to select a beginning and ending port number.
Use the drop-down menu to toggle between Enabled and Disabled.
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