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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.
In a stable network, this type of spanning tree calculation might occur because the upstream device
is busy. You can avoid such unwanted spanning tree calculations by lengthening the timeout period
to save network resources. As a best practice, set the timeout factor to 5, 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
Related commands
stp timer hello
stp transmit-limit
Use stp transmit-limit to set the BPDU transmission rate of a port.
Use undo stp transmit-limit to restore the default.
Syntax
stp transmit-limit limit
undo stp transmit-limit
Default
The BPDU transmission rate of all ports is 10. Each port can send 10 BPDUs within each hello time.
Views
Layer 2 Ethernet interface view, Layer 2 aggregate interface view
Predefined user roles
network-admin
Parameters
limit: Sets the BPDU transmission rate in the range of 1 to 255.
Usage guidelines
The maximum number of BPDUs a port can send within each hello time equals the BPDU
transmission rate plus the hello timer value.
A larger BPDU transmission rate value requires more system resources. An appropriate BPDU
transmission rate setting can prevent spanning tree protocols from using excessive bandwidth
resources during network topology changes. As a best practice, use the default value.
When the setting is configured in Layer 2 Ethernet interface view, it takes effect only on that
interface.
When the setting is configured in Layer 2 aggregate interface view, it takes effect only on the
aggregate interface.
When the setting is configured on a member port in an aggregation group, it takes effect only after
the port leaves the aggregation group.
Examples
# Set the BPDU transmission rate of port GigabitEthernet 1/0/1 to 5.
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