stp (MSTP process view)

Function

The stp enable command enables STP/Rapid Spanning Tree Protocol (RSTP)/Multiple Spanning Tree Protocol (MSTP) on an MST region.

The stp disable command disables STP/RSTP/MSTP on an MST region.

The undo stp enable command cancels the stp enable command configuration.

The undo stp disable command cancels the stp disable command configuration.

By default, STP/RSTP/MSTP is disabled on an MST region.

Format

stp { enable | disable }

undo stp { enable | disable }

Parameters

Parameter	Description	Value
enable	Enables STP/RSTP/MSTP.	-
disable	Disables STP/RSTP/MSTP.	-

Parameter

Description

Value

enable

Enables STP/RSTP/MSTP.

disable

Disables STP/RSTP/MSTP.

Views

MSTP process view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
mstp	write

Usage Guidelines

Usage Scenario

On a complex Layer 2 network, STP/RSTP/MSTP can be configured on devices to prevent or break loops.

To enable STP/RSTP/MSTP, run the stp enable command. The devices running STP/RSTP/MSTP exchange information to discover loops on the network and block some interfaces to trim the ring topology into a loop-free tree topology. This prevents packet replication and circular propagation and device performance deterioration.

Spanning tree calculation consumes system resources. Therefore, run the stp disable command to disable STP/RSTP/MSTP on devices or interfaces that do not need to participate in spanning tree calculation.

Precautions

STP/RSTP/MSTP must be enabled on all interfaces that participate in spanning tree calculation. Otherwise, a loop may occur.
If STP and VPLS multi-homing (VPLS multi-homing enables data packets to be blocked on the backup PE's AC interface, preventing loops) have been deployed, the AC interfaces of both the master and backup PEs may be blocked because the backup PE's AC interface does not block Layer 2 protocol packets.
If the undo stp enable or stp disable command is run in the MSTP process view, the STP/RSTP/MSTP function in the MSTP process is disabled, which may cause a loop in the MSTP process.

Example

# Enable STP/RSTP/MSTP on MST region.

<HUAWEI> system-view
[~HUAWEI] stp process 1
[*HUAWEI-mst-process-1] stp enable