D-Link DGS-1210-16 - L2 Functions > Loopback Detection

Configuration D-Link Web Smart Switch User Manual
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TX (transmit) mode: Duplicates the data transmitted from the source port and forwards it to the Target Port.
Click All to include all ports into port mirroring.
RX (receive) mode: Duplicates the data that is received from the source port and forwards it to the Target
Port. Click All to include all ports into port mirroring.
TX/RX (transmit and receive) mode: Duplicate both the data transmitted from and data sent to the source
port, and forwards all the data to the assigned Target Port. Click All to include all ports into port mirroring.
None: Turns off the mirroring of the port. Click All to remove all ports from mirroring.
Click Apply to implement the changes made.
L2 Functions > 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 shut down the port and sends a log to the administrator. 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 the same time.
Figure 4.38 – L2 Functions > Loopback Detection
Loopback Detection: Click to enable or disable loopback detection. The default is Disabled.
Mode: Specifies Port-based or VLAN-based mode. If the port-based mode is selected, the loop happening
port will be shut down and affect all member VLANs. If the VLAN-based mode is selected, only the member
port in the loop happening VLAN will be shut down.
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 / To Port: 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.