stp timer-factor

Use stp timer-factor to configure the timeout period by setting the timeout factor.

Timeout period = timeout factor × 3 × hello time.

Use undo stp timer-factor to restore the default.

Syntax

stp timer-factor factor

undo stp timer-factor

Default

The timeout factor of the device is set to 3.

Views

System view

Predefined user roles

network-admin

mdc-admin

Parameters

factor: Specifies the timeout factor in the range of 1 to 20.

Usage guidelines

In a stable network, each non-root-bridge forwards configuration BPDUs to surrounding devices at the interval of hello time to determine whether any link fails. If a device does not receive a BPDU from the upstream device within nine times of the hello time, it assumes that the upstream device has failed. Then it will start a new spanning tree calculation process.

As a best practice, set the timeout factor to 5, 6, or 7 in the following situations:

• To prevent undesired spanning tree calculations. An upstream device might be too busy to forward configuration BPDUs in time, for example, many Layer 2 interfaces are configured on the upstream device. In this case, the downstream device fails to receive a BPDU within the timeout period and then starts an undesired spanning tree calculation.

• To save network resources on a stable network.

Examples

# Set the timeout factor of the device to 7.

<Sysname> system-view
[Sysname] stp timer-factor 7

Related commands

stp timer hello