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Step Command Remarks
1. Enter system view.
system-view
N/A
2. Set the loop detection
interval.
loopback-detection
interval-time
interval
The default setting is 30 seconds.
Displaying and maintaining loop detection
Execute display commands in any view.
Task Command
Display the loop detection configuration and status.
display loopback-detection
Loop detection configuration example
Network requirements
As shown in Figure 20, configure loop detection on Device A, so that Device A generates a log as a
notification and automatically shuts down the port on which a loop is detected.
Figure 34 Network diagram
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
GE1/0/1
Device A
Device B Device C
GE1/0/2
VLAN 100
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