xStack
®
DGS-3620 Series Layer 3 Managed Stackable Gigabit Switch Web UI Reference Guide
364
Loopback Detection Settings
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 or a VLAN, this 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 normal 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 drop-down menu.
To view this window, click
Security > Loopback Detection Settings
as shown below:
Figure 8-50 Loopback Detection Settings window
The fields that can be configured are described below:
Parameter
Description
Loopback Detection
State
Use the radio button to enable or disable loopback detection. The default is
Disabled.
Mode
Use the drop-down menu to toggle between
Port-based
and
VLAN-based
.
Trap State
Use the drop-down menu to set the desired trap status:
None
,
Loop Detected
,
Loop
Cleared
, or
Both
.
Log State
Use the drop-down menu to enable or disable the state of the log for loopback
detection.
Interval (1-32767)
The time 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 (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 Loop-detect Recover Time. The default is
60
seconds.
From Port / To Port
Select a range of ports to use for this configuration.
State
Use the drop-down menu to toggle between
Enabled
and
Disabled
.
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