TP-Link TL-SG2216 User Manual page 45

Choose the menu Switching→Port→Loopback Detection to load the following page.
The following entries are displayed on this screen
Port Config

Port Select:
Select:
Port:
Status:
Operation Mode:
Recovery Mode:
Figure 5-6 Loopback Detection Config
:
Click the Select button to quick-select the corresponding port
based on the port number you entered.
Select the desired port for Loopback Detection configuration. It is
multi-optional.
Displays the port number.
Enable or disable Loopback Detection function for the port.
Select the mode how the switch processes the detected loops.

Alert: When a loop is detected, display an alert.

Port based: When a loop is detected, display an alert and
block the port.
Select the mode how the blocked port recovers to normal status.

Auto: Block status can be automatically removed after
recovery time.

Manual: Block status only can be removed manually.
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