User manual
D-Link Web Smart Switch User Manual
L2 Features > Loopback Detection
The Loopback Detection function is used to detect the loop 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 shutdown the port. The Loopback Detection port will be unlocked
when the Loopback Detection Recover Time times out. The Loopback Detection function can be
implemented on a range of ports at a time. You may enable or disable this function using the pull-down menu.
Figure 49 – L2 Features > Loopback Detection
Loopback Detection State: Use the drop-down menu to enable or disable loopback detection. The default
is Disabled.
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.
From Port: The beginning of a consecutive group of ports may be configured starting with the selected port.
To Port: The ending of a consecutive group of ports may be configured starting with the selected port.
State: Use the drop-down menu to toggle between Enabled and Disabled. Default is Disabled.
Click Apply to implement changes made.
NOTE: Member ports of link aggregation
groups cannot support Loopback Detection.
L2 Features > Statistics
The Statistics screen displays the status of each port packet count. It offers several options such as Receive
Packet & Transmit Packet, Transmit Packet & Collision, Receive Packet & Drop Packet and Receive
Packet & CRC Packet.
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