l2-loop-detect action shutdown

Function

The l2-loop-detect action shutdown command enables the system to shut down the interface on which a Layer 2 loop is detected.

The undo l2-loop-detect action shutdown command disables the system from shutting down the interface on which a Layer 2 loop is detected.

By default, the system will not shut down the interface on which a Layer 2 loop is detected.

Format

l2-loop-detect action shutdown [ up-times up-times | up-interval up-interval ] ^*

undo l2-loop-detect action shutdown

Parameters

Parameter	Description	Value
up-times up-times	Configures the maximum number of consecutive times that the system allows the Down interface to go Up in an interval. After the maximum number of consecutive times, the system will not automatically allow the Down interface to go Up. If you want the interface to go Up, you must manually reset the board where the interface resides.	The value is an integer in the range 1 to 10. The default value is 5.
up-interval up-interval	Configure the initial interval between when the interface shuts down and when it goes to the Up state. Each interval between when the interface shuts down and when it goes to the Up state is twice as long as the previous interval.	The value is an integer in the range 1 to 10, in minutes. The default value is 5 minutes.
shutdown	Enables the system to shut down the interface on which a Layer 2 loop is detected.	-

Parameter

Description

Value

up-times up-times

Configures the maximum number of consecutive times that the system allows the Down interface to go Up in an interval. After the maximum number of consecutive times, the system will not automatically allow the Down interface to go Up. If you want the interface to go Up, you must manually reset the board where the interface resides.

The value is an integer in the range 1 to 10. The default value is 5.

up-interval up-interval

Configure the initial interval between when the interface shuts down and when it goes to the Up state.

Each interval between when the interface shuts down and when it goes to the Up state is twice as long as the previous interval.

The value is an integer in the range 1 to 10, in minutes. The default value is 5 minutes.

shutdown

Enables the system to shut down the interface on which a Layer 2 loop is detected.

Views

Slot view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
device-mgr	write

Usage Guidelines

Usage Scenario

The CPU determines whether to enable or disable Layer 2 loop detection based on packet loss caused by the CAR. After Layer 2 loop detection is enabled, the CPU will take the configured action in response to Layer 2 loops after the system detects an existing or a potential loop on an interface.

The system can be configured to take one of the following actions in response to an existing or possible Layer 2 loop on an interface:

Shut down the interface: The system will shut down the interface only after detecting an existing Layer 2 loop on the interface. This action stops the interface from sending numerous packets to the CPU.
Send a trap: The system will send a trap after detecting an existing or a potential Layer 2 loop. The trap message can help a user locate the interface where the Layer 2 loop has occurred or may occur.
Send a trap and shut down the interface: The system will send a trap and shut down the interface after detecting an existing Layer 2 loop on the interface.
Ignore Layer 2 loops: The system will generate a log, but not shut down the interface or send a trap.
To enable the system to shut down the interface on which a Layer 2 loop is detected, run the l2-loop-detect action shutdown.

Precautions

Whether the preceding actions are configured, the system will generate a log after detecting an existing or a potential Layer 2 loop.

In VS mode, this command is supported only by the admin VS.

Example

# Enable the system to shut down the interface on the board in slot 1 after a loop is detected.

<HUAWEI> system-view
[~HUAWEI] slot 1
[*HUAWEI-slot-1] l2-loop-detect action shutdown