H3C Technologies H3C S12500-X Series Switches - Manual (Page 117)

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Setting the loop detection interval
With loop detection enabled, the device sends loop detection frames at a specified interval. A shorter
interval offers more sensitive detection but consumes more resources. Consider the system performance
and loop detection speed when you set the loop detection interval.
To set the loop detection interval:
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 29 , 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 29 Network diagram
XGE1/0/1
Device A
Device B Device C
XGE1/0/2
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G
E
1
/0
/2
X
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E
1
/0
/1
X
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/0
/1
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/0
/2
VLAN 100