Stp Timer-Factor; Stp Transmit-Limit - H3C S7500E Series Command Manual

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Command Manual – MSTP

H3C S7500E Series Ethernet Switches

1.1.40 stp timer-factor

stp timer-factor number

undo stp timer-factor

number: Timeout factor, in the range of 1 to 20.

Use the stp timer-factor command to configure the timeout time of the device by

setting the timeout factor. Timeout time = timeout factor × 3 × hello time.

Use the undo stp timer-factor command to restore the default timeout factor.

By default, the timeout factor of the device is set to 3.

After the network topology is stabilized, each non-root-bridge device forwards

configuration BPDUs to the surrounding devices at the interval of hello time to check

whether any link is faulty. Typically, if a device does not receive a BPDU from the

upstream device within nine times the hello time, it will assume that the upstream

device has failed and start a new spanning tree calculation process.

In a very stable network, this kind of spanning tree calculation may occur because the

upstream device is busy. In this case, you can avoid such unwanted spanning tree

calculation by lengthening the timeout time (by setting the timeout factor to 4 or more).

We recommend that you set the timeout factor to 5, or 6, or 7 for a stable network.

# Set the timeout factor of the device to 7.

<Sysname> system-view

[Sysname] stp timer-factor 7

stp transmit-limit packet-number

undo stp transmit-limit

Ethernet interface view, port group view

Chapter 1 MSTP Configuration Commands

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