DGS-3700-12/DGS-3700-12G Series Layer 2 Gigabit Ethernet Switch User Manual
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The Loopback Detection function is used to detect the loop created by a spec ific port. This feature is used to
temporarily shutdown a port on the Switch when a loop detecting packet has been looped back to the s witch. 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 Loop back Detection
port will restart (change to discarding state) when the Loopback Detection Recover Tim e 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
(0 or 60-1000000) 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 w ill disa bl e th e
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.