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4 Configuration D-Link Smart Managed Switch User Manual
32
L2 Features > Loopback Detection
The Loopback Detection function is used to detect loops created by a specific port while Spanning Tree
Protocol (STP) is not enabled in the network, especially when the down links are hubs or unmanaged
switches. The Switch will automatically shut down the port and send a log to the administrator. The looping
port will be unlocked when the Loopback Detection Recover Time times out. Loopback Detection can also
be enabled or disabled for a specified range of ports simultaneously.
Figure 4.40 – L2 Features > Loopback Detection
The fields that can be configured are described below:
Item Description
Loopback Detection Global Settings
Loopback Detection
Specify to enable or disable loopback detection function. The
default is Disabled.
Time Interval (1-32767)
Set a Loop detection Interval between 1 and 32767 seconds.
The default is 10 seconds.
Recover Time (0 or 60-
1000000)
Time allowed (in seconds) for recovery when a Loopback is
detected. The Loop Detection Recover Time can be set at 0
seconds, or 60 to 1000000 seconds. Entering 0 will disable the
Loop Detection Recover Time. The default is 60 seconds
Loopback Detection Port Settings
From Port / To Port
Sele
ct the range of ports to enable or disable Loopback
Detection for.
State
Enable or disable Loopback Detection for the specified range
of ports.
Table 4.23
Click Apply to make the configurations take effect.
Click Refresh to renew the Loopback Detection table.
L2 Features > Link Aggregation
The Link Aggregation function enables the combining of two or more ports together to increase bandwidth.
Each Link Aggregation group supports a maximum of four ports.
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