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Fat AP and Cloud AP V200R010C00 Command Reference

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stp loop-protection

stp loop-protection


The stp loop-protection command enables loop protection on the current port.

The undo stp loop-protection command disables loop protection on the current port.

By default, loop protection on ports is disabled.


stp loop-protection

undo stp loop-protection




GE interface view, Eth-Trunk interface view, XGE interface view, MultiGE interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

On a network running a spanning tree protocol, a switching device maintains the status of the root port and blocked port by continually receiving BPDUs from the upstream switching device. If ports cannot receive BPDUs from the upstream switching device due to link congestion or unidirectional link failures, the switching device will re-select a root port. Then, the previous root port becomes a designated port and the previous blocked port enters the Forwarding state. As a result, loops may occur on the network.

The stp loop-protection command can be used to configure loop protection in order to prevent this problem. If the root port or the Alternate port cannot receive BPDUs from the upstream device for a long period of time after the loop protection function is enabled, the root port or the Alternate port will send a notification message to the NMS. The root port will enter the Discarding state, and the Alternate port remains in the blocked state and no longer forwards packets. This prevents loops on the network. The root port or Alternate port restores the Forwarding state after receiving BPDUs.

  • An Alternate port is the backup of the root port. When the root port can normally send and receive BPDUs, the Alternate port is in the blocked state.

  • Between two interconnected switching devices in a spanning tree, the switching device nearer to the root bridge is the upstream device of the other devices.


Loop protection and root protection cannot be configured on the same interface simultaneously.


# Enable loop protection on the GE0/0/1.
<Huawei> system-view
[Huawei] interface gigabitethernet 0/0/1
[Huawei-GigabitEthernet0/0/1] stp loop-protection
Updated: 2019-11-21

Document ID: EDOC1100064352

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