Command Manual – MSTP
H3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration Commands
1-38
1.1.40 stp timer-factor
Syntax
stp timer-factor number
undo stp timer-factor
View
System view
Parameters
number: Timeout factor, in the range of 1 to 20.
Description
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.
Examples
# Set the timeout factor of the device to 7.
<Sysname> system-view
[Sysname] stp timer-factor 7
1.1.41 stp transmit-limit
Syntax
stp transmit-limit packet-number
undo stp transmit-limit
View
Ethernet interface view, port group view
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