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

mdc-admin

mdc-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     VLANs
 Ten-GigabitEthernet1/0/3 None            10

Table 34: Command output

Field	Description
Action mode	Loop protection action: Block—When a loop is detected on a port, the device performs the following operations: Generates a log. Disables the port from learning MAC addresses. Blocks 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 performs the following operations: Generates a log. Shuts down the port to disable the port from receiving or sending frames. The device automatically sets the port to the forwarding state after a time interval. Set the time interval by using the shutdown-interval command (see Fundamentals Command Reference).
VLANs	VLANs to which the interface belongs and where loops are detected.

Field

Description

Action mode

Loop protection action:

Block—When a loop is detected on a port, the device performs the following operations:
- Generates a log.
- Disables the port from learning MAC addresses.
- Blocks 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 performs the following operations:
- Generates a log.
- Shuts down the port to disable the port from receiving or sending frames. The device automatically sets the port to the forwarding state after a time interval. Set the time interval by using the shutdown-interval command (see Fundamentals Command Reference).

VLANs

VLANs to which the interface belongs and where loops are detected.

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