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                            Action mode
 Ten-GigabitEthernet1/0/1              Block
 Ten-GigabitEthernet1/0/2              Shutdown
 Ten-GigabitEthernet1/0/3              None
 Ten-GigabitEthernet1/0/4              No-learning

Table 37: Command output

Field	Description
Action mode	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.

Field

Description

Action mode

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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