H3C Technologies H3C S5560 Series Switches - Manual (Page 152)

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# Configure GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 as trunk ports, and assign them
to VLAN 100.
[DeviceB] interface gigabitethernet 1/0/1
[DeviceB-GigabitEthernet1/0/1] port link-type trunk
[DeviceB-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceB-GigabitEthernet1/0/1] quit
[DeviceB] interface gigabitethernet 1/0/2
[DeviceB-GigabitEthernet1/0/2] port link-type trunk
[DeviceB-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceB-GigabitEthernet1/0/2] quit
3. Configure Device C:
# Create VLAN 100.
system-view
[DeviceC] vlan 100
[DeviceC–vlan100] quit
# Configure GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 as trunk ports, and assign them
to VLAN 100.
[DeviceC] interface gigabitethernet 1/0/1
[DeviceC-GigabitEthernet1/0/1] port link-type trunk
[DeviceC-GigabitEthernet1/0/1] port trunk permit vlan 100
[DeviceC-GigabitEthernet1/0/1] quit
[DeviceC] interface gigabitethernet 1/0/2
[DeviceC-GigabitEthernet1/0/2] port link-type trunk
[DeviceC-GigabitEthernet1/0/2] port trunk permit vlan 100
[DeviceC-GigabitEthernet1/0/2] quit
Verifying the configuration
# View the system logs on devices, for example, Device A.
[DeviceA]
%Feb 24 15:04:29:663 2013 DeviceA LPDT/4/LPDT_LOOPED: Loopback exists on
GigabitEthernet1/0/1.
%Feb 24 15:04:29:667 2013 DeviceA LPDT/4/LPDT_LOOPED: Loopback exists on
GigabitEthernet1/0/2.
%Feb 24 15:04:44:243 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on GigabitEthernet1/0/1
recovered.
%Feb 24 15:04:44:248 2013 DeviceA LPDT/5/LPDT_RECOVERED: Loopback on GigabitEthernet1/0/2
recovered.
The output shows the following information:
• Device A detected loops on ports GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 within a
loop detection interval.
• Loops on ports GigabitEthernet 1/0/1 and GigabitEthernet 1/0/2 were removed.
# Use the display loopback-detection command to display the loop detection configuration and status on
devices, for example, Device A.
[DeviceA] display loopback-detection
Loop detection is enabled.
Loop detection interval is 35 second(s).