D-Link DGS-3700 Loopback Detection Settings, Parameter Description LBD State, Trap Status

DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet 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 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 L2 Features > Loopback Detection Settings as shown below:

	Figure 3 - 56 Loopback Detection Settings window
The following parameters can be configured:
Parameter	Description
LBD State	Used to Enable or Disable loopback detection. The default is Disabled.
Mode	Use the drop-down menu to toggle between Port Based and VLAN Based.
Interval (1-32767)	Set a Loopdetect Interval between 1 and 32767 seconds. The default is 10 seconds.
Trap Status	Select the trap status, choose None, Loop Detected, Loop Cleared or Both.
Recover Time	Time allowed (in seconds) for recovery when a Loopback is detected. The Loopdetect
(0 or 60-1000000)	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 / To Port	Use the drop-down menu to select a beginning and 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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