H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 81)

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Configuring the timeout factor
The timeout factor is a parameter used to decide the timeout time, as shown in the following formula:
Timeout time = timeout factor × 3 × hello time.
After the network topology is stabilized, each non-root-bridge device forwards configuration BPDUs to
the downstream devices at the interval of hello time to check whether any link is faulty. If a device does
not receive a BPDU from the upstream device within nine times the hello time, it assumes that the
upstream device has failed and starts a new spanning tree calculation process.
Sometimes a device may fail to receive a BPDU from the upstream device because the upstream device
is busy. If a spanning tree calculation occurs, the calculation can fail and also waste the network
resources. In a stable network, you can prevent undesired spanning tree calculations by setting the
timeout factor to 5, 6, or 7.
To configure the timeout factor:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure the timeout factor of the
device.
stp timer-factor factor 3 by default.
Configuring the maximum port rate
The maximum rate of a port refers to the maximum number of BPDUs the port can send within each hello
time. The maximum rate of a port is related to the physical status of the port and the network structure.
To configure the maximum rate of a port or a group of ports:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enter interface view or port group
view.
• Enter Ethernet interface view
interface interface-type
interface-number
• Enter port group view
port-group manual
port-group-name
Use either command.
3. Configure the maximum rate of the
ports.
stp transmit-limit limit 10 by default.
NOTE:
The higher the maximum port rate is, the more BPDUs are sent within each hello time, and the more system
resources are used. By setting an appropriate maximum port rate, you can limit the rate at which the port
sends BPDUs and prevent spanning tree protocols from using excessive network resources when the
network becomes instable. H3C recommends you to use the default setting.