l2-loop-detect loop-level-threshold

Function

The l2-loop-detect loop-level-threshold command configures the loop level threshold on a detected main interface or sub-interface.

The undo l2-loop-detect loop-level-threshold command restores the default loop level threshold on a detected main interface or sub-interface.

By default, the determined, suspect, and notification Layer 2 loop thresholds for a main interface are 3000, 2000, and 1000, respectively. By default, the determined, suspect, and notification Layer 2 loop thresholds for a sub-interface are 300, 200, and 100, respectively.

Format

l2-loop-detect loop-level-threshold main-interface determined determined-threshold suspect suspect-threshold notification notification-threshold

l2-loop-detect loop-level-threshold sub-interface determined determined-threshold suspect suspect-threshold notification notification-threshold

undo l2-loop-detect loop-level-threshold main-interface determined determined-threshold suspect suspect-threshold notification notification-threshold

undo l2-loop-detect loop-level-threshold sub-interface determined determined-threshold suspect suspect-threshold notification notification-threshold

Parameters

Parameter	Description	Value
suspect suspect-threshold	Specifies the suspect loop threshold.	The value is an integer ranging from 2 to 5999,in packets. By default, the suspect Layer 2 loop thresholds of a main interface and sub-interface are 2000 and 200, respectively.
notification notification-threshold	Specifies the notification loop threshold.	The value is an integer ranging from 1 to 5998, in packets. By default, the notification Layer 2 loop thresholds of a main interface and sub-interface are 1000 and 100, respectively.
sub-interface	Indicates a sub-interface.	-
determined determined-threshold	Specifies the determined loop threshold.	The value is an integer ranging from 3 to 6000, in packets. By default, the determined Layer 2 loop thresholds of a main interface and sub-interface are 3000 and 300, respectively.
main-interface	Indicates a main interface.	-

Views

Slot view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
soc	write

Usage Guidelines

Usage Scenario

If the loop level threshold is not properly set, the displayed loop level may be inaccurate. To resolve this problem, run the l2-loop-detect loop-level-threshold command to modify the loop level threshold based on the live network experience. When the number of dropped packets reaches or exceeds the configured loop level threshold within a detection period (5s), the device displays a loop of the corresponding level.

The loop level threshold on a main interface must be greater than that on a sub-interface. If the loop level threshold on a main interface is smaller than that on a sub-interface and a loop occurs on the sub-interface, the system considers that the loop occurs on the main interface, and detection on the sub-interface does not take effect.

Precautions

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

Before running the l2-loop-detect loop-level-threshold command, obtain the experience values of packet loss statistics. If the configured loop level threshold is too low, Layer 2 loop faults may be mistakenly reported.

It is recommended that you run this command with assistance from Huawei engineers.

Example

# Set the loop level threshold on a detected sub-interface of the board in slot 1.

<HUAWEI> system-view
[~HUAWEI] slot 1
[*HUAWEI-slot-1] l2-loop-detect loop-level-threshold sub-interface determined 301 suspect 201 notification 101

# Set the loop level threshold on a detected main interface of the board in slot 1.

<HUAWEI> system-view
[~HUAWEI] slot 1
[*HUAWEI-slot-1] l2-loop-detect loop-level-threshold main-interface determined 3001 suspect 2001 notification 1001