HP VPN Firewall Appliances Network Management Configuration Guide
91
Ste
p
Command
Remarks
3. Configure the hello timer.
stp timer hello time
Optional.
Use one of the commands.
The default setting is 2 seconds.
4. Configure the max age
timer.
stp timer max-age time
Optional.
Use one of the commands.
The default setting is 20 seconds.
Configuring the timeout factor
The timeout factor is a parameter used to calculate the timeout time in the following formula: Timeout time
= timeout factor × 3 × hello time.
After the network topology stabilizes, each non-root-bridge device forwards configuration BPDUs to
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 default timeout factor x 3) 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. In this case, 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, resulting in a longer timeout time.
To configure the timeout factor:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Configure the timeout factor of the device.
stp timer-factor factor The default setting is 3.
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 that you use the default setting.
To configure the maximum rate of a port:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter Ethernet interface view or Layer 2
aggregate interface view.
interface interface-type
interface-number
N/A
3. Configure the maximum rate of the ports.
stp transmit-limit limit The default setting is 10.