Using The Cli - TP-Link T1600G Series Configuration Manual

Managing Physical Interfaces
Figure 7-9 Global Configuration
3) In the Port Config section, enable ports 1/0/1-3, select the operation mode as Port
based so that the port will be blocked when a loop is detected, and keep the recovery
mode as Auto so that the port will recover to normal status after the automatic recovery
time. Click Apply.
Figure 7-10 Port Configuration
4) Monitor the detection result on the above page. The Loop status and Block status are
displayed on the right side of ports.

7.3.4 Using the CLI

1) Enable loopback detection globally and configure the detection interval and recovery
time.
Switch#configure
Switch(config)#loopback-detection
Switch(config)#loopback-detection interval 30
Switch(config)#loopback-detection recovery-time 90
2) Enable loopback detection on ports 1/0/1-3 and set the process mode and recovery
mode.
Switch(config)#interface range gigabitEthernet 1/0/1-3
Configuration Examples
Configuration Guide 103