H3C Technologies H3C S12500-X Series Switches - Manual (Page 118)

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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