stp revertive slow

Function

The stp revertive slow command enables the delay in revertive switching during VBST calculation on a port.

The undo stp revertive slow command disables the delay in revertive switching during VBST calculation on a port.

By default, the delay in revertive switching disabled during VBST calculation on a port.

Format

stp revertive slow

undo stp revertive slow

Parameters

None

Views

Ethernet interface view, GE interface view, XGE interface view, MultiGE interface view, 40GE interface view, 100GE interface view, Eth-Trunk interface view, port group view, 25GE interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

When a VBST-enabled switch interworks with a PVST-enabled third-party device that does not support P/A negotiation, negotiation is asynchronous. As a result, the network convergence time is long. If the remote device is the root bridge and the VBST-enabled switch provides the alternate port in addition to the interconnected port, you can enable the delay in revertive switching on the interconnected interface. The delay is calculated as follows: 2 * Forward Delay + 8s After the delay function is enabled, the remote interface first completes spanning tree calculation when the port status changes. Then the local interface performs spanning tree status switching. During status switching, services are not interrupted.

Precautions

After the delay in revertive switching is enabled on a port, this function takes effect for all VLANs that the interface join. If there is no alternate port in the VLAN where the interconnected port belongs, the port needs to wait for the delay for recovery. Exercise caution when you run this command in this situation.

Example

<HUAWEI> system-view
[HUAWEI] stp mode vbst
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] stp revertive slow