Configuration procedure

  1. Configure Device A:

    # Create VLAN 100, and globally enable loop detection for the VLAN.

    <DeviceA> system-view
    [DeviceA] vlan 100
    [DeviceA-vlan100] quit
    [DeviceA] loopback-detection global enable vlan 100
    

    # Configure Ten-GigabitEthernet 1/0/1 and Ten-GigabitEthernet 1/0/2 as trunk ports, and assign them to VLAN 100.

    [DeviceA] interface ten-gigabitethernet 1/0/1
    [DeviceA-Ten-GigabitEthernet1/0/1] port link-type trunk
    [DeviceA-Ten-GigabitEthernet1/0/1] port trunk permit vlan 100
    [DeviceA-Ten-GigabitEthernet1/0/1] quit
    [DeviceA] interface ten-gigabitethernet 1/0/2
    [DeviceA-Ten-GigabitEthernet1/0/2] port link-type trunk
    [DeviceA-Ten-GigabitEthernet1/0/2] port trunk permit vlan 100
    [DeviceA-Ten-GigabitEthernet1/0/2] quit
    

    # Configure the global loop protection action as shutdown.

    [DeviceA] loopback-detection global action shutdown
    

    # Set the loop detection interval to 35 seconds.

    [DeviceA] loopback-detection interval-time 35
    
  2. Configure Device B:

    # Create VLAN 100.

    <DeviceB> system-view
    [DeviceB] vlan 100
    [DeviceB–vlan100] quit
    

    # Configure Ten-GigabitEthernet 1/0/1 and Ten-GigabitEthernet 1/0/2 as trunk ports, and assign them to VLAN 100.

    [DeviceB] interface ten-gigabitethernet 1/0/1
    [DeviceB-Ten-GigabitEthernet1/0/1] port link-type trunk
    [DeviceB-Ten-GigabitEthernet1/0/1] port trunk permit vlan 100
    [DeviceB-Ten-GigabitEthernet1/0/1] quit
    [DeviceB] interface ten-gigabitethernet 1/0/2
    [DeviceB-Ten-GigabitEthernet1/0/2] port link-type trunk
    [DeviceB-Ten-GigabitEthernet1/0/2] port trunk permit vlan 100
    [DeviceB-Ten-GigabitEthernet1/0/2] quit
    
  3. Configure Device C:

    # Create VLAN 100.

    <DeviceC> system-view
    [DeviceC] vlan 100
    [DeviceC–vlan100] quit
    

    # Configure Ten-GigabitEthernet 1/0/1 and Ten-GigabitEthernet 1/0/2 as trunk ports, and assign them to VLAN 100.

    [DeviceC] interface ten-gigabitethernet 1/0/1
    [DeviceC-Ten-GigabitEthernet1/0/1] port link-type trunk
    [DeviceC-Ten-GigabitEthernet1/0/1] port trunk permit vlan 100
    [DeviceC-Ten-GigabitEthernet1/0/1] quit
    [DeviceC] interface ten-gigabitethernet 1/0/2
    [DeviceC-Ten-GigabitEthernet1/0/2] port link-type trunk
    [DeviceC-Ten-GigabitEthernet1/0/2] port trunk permit vlan 100
    [DeviceC-Ten-GigabitEthernet1/0/2] quit