QTECH QSW-2800 Инструкция по настройке - Manual (Page 68)

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Switch(config)#interface ethernet 1/1
Switch(Config-If-Ethernet1/1)#loopback-detection special-vlan 1-3
Switch(Config-If-Ethernet1/1)#loopback-detection control block
If adopting the control method of block, MSTP should be globally enabled. And the
corresponding relation between the spanning tree instance and the VLAN should be
configured.
Switch(config)#spanning-tree
Switch(config)#spanning-tree mst configuration
Switch(Config-Mstp-Region)#instance 1 vlan 1
Switch(Config-Mstp-Region)#instance 2 vlan 2
Switch(Config-Mstp-Region)#
6.4 Port Loopback Detection
Troubleshooting
The function of port loopback detection is disabled by default and should only be enabled if
required.