R0106-HP MSR Router Series Layer 2 - LAN Switching Configuration Guide(V7)

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The output shows the following information:
• Router A detects loops on ports GigabitEthernet 2/1/1 and GigabitEthernet 2/1/2 within a loop
detection interval.
• Router A automatically shuts down the ports and generates log messages.
# Use the display loopback-detection command to display the loop detection configuration and status on
routers, for example, Router A.
[RouterA] display loopback-detection
Loop detection is enabled.
Loop detection interval is 35 second(s).
No loopback is detected.
The output shows that Router A has removed the loops from GigabitEthernet 2/1/1 and GigabitEthernet
2/1/2 according to the shutdown action.
# Display the status of GigabitEthernet 2/1/1 on routers, for example, Router A.
[RouterA] display interface gigabitethernet 2/1/1
GigabitEthernet2/1/1 current state: DOWN (Loop detection down)
...
The output shows that GigabitEthernet 2/1/1 is already shut down by the loop detection module.
# Display the status of GigabitEthernet 2/1/2 on routers, for example, Router A.
[RouterA] display interface gigabitethernet 2/1/2
GigabitEthernet2/1/2 current state: DOWN (Loop detection down)
...
The output shows that GigabitEthernet 2/1/2 is already shut down by the loop detection module.