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Loop detection commands
display loopback-detection
Use display loopback-detection to display the loop detection configuration and status.
Syntax
display loopback-detection
Views
Any view
Predefined user roles
network-admin
network-operator
Example
# Display the loop detection configuration and status.
<Sysname> display loopback-detection
Loopback detection is enabled.
Loopback detection interval is 30 second(s).
Loopback is detected on following interfaces:
Interface
GigabitEthernet1/0/1
GigabitEthernet1/0/2
GigabitEthernet1/0/3
GigabitEthernet1/0/4
Table 34 Command output
Field
Action mode
loopback-detection action
Use loopback-detection action to configure the loop protection action on a port.
Use undo loopback-detection action to restore the default.
Action mode
Block
Shutdown
None
No-learning
Description
Loop protection action:
•
Block—When a loop is detected on a port, the device generates a log,
disables the port from learning MAC addresses, and blocks inbound traffic
on the port.
•
None—When a loop is detected on a port, the device generates a log but
performs no action on the port.
•
No-learning—When a loop is detected on a port, the device generates a
log and disables the port from learning MAC addresses.
•
Shutdown—When a loop is detected on a port, the device generates a log
and shuts down the port to disable it from receiving and sending any
frames. The device automatically brings up the port after the detection
timer expires. You can use the shutdown-interval command to set the
detection timer. For more information, see Fundamentals Command
Reference.
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