H3C S7500E Series Ethernet Switches Operation Manual

Operation Manual – MSTP
H3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration
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1.3.8 Configuring the Timeout Factor
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.
I. Configuration procedure
Follow these steps to configure the timeout factor:
To do... Use the command... Remarks
Enter system view
system-view
—
Configure the timeout
factor of the device
stp timer-factor number
Optional
3 by default
 Note:
z Timeout time = timeout factor × 3 × hello time.
z Typically, we recommend that you set the timeout factor to 5, or 6, or 7 for a stable
network.
II. Configuration example
# Set the timeout factor to 6.
<Sysname> system-view
[Sysname] stp timer-factor 6
1.3.9 Configuring the Maximum Transmission Rate of Ports
The maximum transmission rate of a port refers to the maximum number of MSTP
packets that the port can send within each hello time. The maximum transmission rate
of an Ethernet port is related to the physical status of the port and the network structure.