(Optional) Configuring the Layer 2 Loop Detection Threshold

If the Layer 2 loop detection threshold is not properly set, Layer 2 loop detection may be unexpectedly enabled or display incorrect loop levels, affecting Layer 2 loop detection results. As a result, some services may be affected.

Context

The system calculates the default Layer 2 loop detection threshold based on the packet loss detection and default algorithm. If the Layer 2 loop detection threshold is not properly set, Layer 2 loop detection may not be enabled or be unexpectedly enabled. To resolve this problem, perform the following operations to modify the Layer 2 loop detection threshold:

It is recommended that you run this command with assistance from Huawei engineers. Before performing the operation, obtain experience values of packet loss statistics on the specified board.

Procedure

Run system-view
The system view is displayed.
Run slot slot-id
The slot view is displayed.
Run l2-loop-detect packets-drop-threshold packets-drop-threshold
The Layer 2 loop detection threshold is configured.
(Optional) Run l2-loop-detect loop-level-threshold main-interface determined determined-threshold suspect suspect-threshold notification notification-threshold
The loop level threshold is configured on a detected main interface.
(Optional) Run l2-loop-detect loop-level-threshold sub-interface determined determined-threshold suspect suspect-threshold notification notification-threshold
The loop level threshold is configured on a detected sub-interface.

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.
Run commit
The configuration is committed.