D-Link DGS-1210-08P - L2 Functions > Loopback Detection

4 Web-based Switch Configuration D-Link Smart Managed Switch User Manual
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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.
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 shutdown 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. You may enable or
disable this function using the pull-down menu.
Figure 4.60 – L2 Functions > Loopback Detection
Loopback Detection: Use the drop-down menu to enable or disable loopback detection. The default is
Disabled.
Mode: Selectable Port-based or VLAN-based mode.
Port-Based mode: Physical port will be shut down once loop detected.
VLAN-Based mode: The particular traffic (VID) will be drop once loop detected. The physical port will NOT
by shut down.
VID List: Specifies the VID.
Interval (1-32767): Set a Loop detection Interval between 1 and 32767 seconds. The default is 2 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.