stp link-share-protection

Function

The stp link-share-protection command enables shared-link protection for a Multiple Spanning Tree Protocol (MSTP) process.

The undo stp link-share-protection command disables shared-link protection of an MSTP process.

By default, shared-link protection of an MSTP process is disabled.

Format

stp link-share-protection

undo stp link-share-protection

Parameters

None

Views

MSTP process view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mstp	write

Usage Guidelines

Usage Scenario

If a public link becomes faulty on a dual-homing networking, rings that the public link accesses may unblock their blocked ports, causing a permanent network loop.

To resolve this problem, run the stp link-share-protection command to enable shared-link protection. When a public link becomes faulty, the working mode of each device on the public link will be forcibly switched to RSTP. After shared-link protection and root protection are deployed, a port will remain in the blocked state after receiving packets of a higher priority from a downstream device. This prevents network loops.

Precautions

Shared-link protection is valid only in processes. Before running the stp link-share-protection command, ports have been correctly bound to the corresponding process using the stp binding process command.

Example

# Enable shared-link protection for MSTP process 1.

<HUAWEI> system-view
[~HUAWEI] stp process 1
[*HUAWEI-mst-process-1] stp link-share-protection