HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 80

Configuring the timeout factor, Configuring the maximum port rate

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Step 1. Enter system view. Command system-view 2. Configure the forward delay timer. stp timer forward-delay time 3. Configure the hello timer. stp timer hello time 4. Configure the max age timer. stp timer max-age time Remarks N/A Optional. The default setting is 15 seconds. Optional. The default setting is 2 seconds. Optional. The default setting is 20 seconds. Configuring the timeout factor The timeout factor is a parameter used to decide the timeout time, 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 determine 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 might 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 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 1. Enter system view. 2. Configure the timeout factor of the device. Command system-view stp timer-factor factor Remarks N/A 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. The higher the maximum port rate is, the more BPDUs will be sent within each hello time, and the more system resources will be 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 unstable. HP recommends you to use the default setting. To configure the maximum rate of a port: 71

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71
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Configure the forward
delay timer.
stp timer forward-delay
time
Optional.
The default setting is 15
seconds.
3.
Configure the hello timer.
stp timer hello
time
Optional.
The default setting is 2
seconds.
4.
Configure the max age
timer.
stp
timer max-age
time
Optional.
The default setting is 20
seconds.
Configuring the timeout factor
The timeout factor is a parameter used to decide the timeout time, 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 determine 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 might 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 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.
The higher the maximum port rate is, the more BPDUs will be sent within each hello time, and the more
system resources will be 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 unstable. HP recommends you to use the default setting.
To configure the maximum rate of a port: