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4 Configuration
Click Apply to make the configurations take effect.
Click Refresh to renew the page.
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.
The fields that can be configured are described below:
Item
Loopback Detection Global Settings
Loopback Detection
Time Interval (1-32767)
Recover Time (0 or 60-
1000000)
Loopback Detection Port Settings
From Port / To Port
State
Click Apply to make the configurations take effect.
Click Refresh to renew the Loopback Detection table.
change to the forwarding state.
In the Edge mode, the port will directly change to the
spanning-tree forwarding state when a link-up occurs without
waiting for the forward-time delay. If the interface receives a
BPDU later, its operation state changes to the non-port-fast
state. By default, this option is Network.
Table 4.23
Figure 4.40 – L2 Features > Loopback Detection
Description
Specify to enable or disable loopback detection function. The
default is Disabled.
Set a Loop detection Interval between 1 and 32767 seconds.
The default is 10 seconds.
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
Select the range of ports to enable or disable Loopback
Detection for.
Enable or disable Loopback Detection for the specified range
of ports.
Table 4.24
32
D-Link Smart Managed Switch User Manual
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