Configuration Restrictions And Guidelines; Configuration Procedure; Configuring The Timeout Factor - HP 3100 Series Configuration Manual

calculate the timers based on the network diameter. If the network diameter uses the default value,
the timers also use their default values.
Configure the timers on the root bridge only, and the timer settings on the root bridge apply to all
devices on the entire switched network.

Configuration restrictions and guidelines

•
The length of the forward delay timer is related to the network diameter of the switched network.
The larger the network diameter is, the longer the forward delay time should be. If the forward
delay timer is too short, temporary redundant paths might occur. If the forward delay timer is too
long, network convergence might take a long time. Hewlett Packard Enterprise recommends
you to use the default setting.
•
An appropriate hello time setting enables the device to quickly detect link failures on the
network without using excessive network resources. If the hello time is too long, the device will
mistake packet loss as a link failure and trigger a new spanning tree calculation process. If the
hello time is too short, the device will frequently send the same configuration BPDUs, which
adds the device burden and wastes network resources. Hewlett Packard Enterprise
recommends you to use the default setting.
•
If the max age timer is too short, the device will frequently begin spanning tree calculation and
might mistake network congestion as a link failure. If the max age timer is too long, the device
might fail to quickly detect link failures and begin spanning tree calculations, reducing the
auto-sensing capability of the network. Hewlett Packard Enterprise recommends you to use the
default setting.

Configuration procedure

To configure the spanning tree timers:
Step
Enter system view.
1.
Configure the forward
2.
delay timer.
Configure the hello
3.
timer.
Configure the max age
4.
timer.

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.
Command
system-view
•
In STP/RSTP/MSTP mode:
stp timer forward-delay time
•
In PVST mode:
stp vlan vlan-list timer
forward-delay time
•
In STP/RSTP/MSTP mode:
stp timer hello time
•
In PVST mode:
stp vlan vlan-list timer hello time
•
In STP/RSTP/MSTP mode:
stp timer max-age time
•
In PVST mode:
stp vlan vlan-list timer max-age time
70
Remarks
N/A
Optional.
Use one of the commands.
The default setting is 15
seconds.
Optional.
Use one of the commands.
The default setting is 2
seconds.
Optional.
Use one of the commands.
The default setting is 20
seconds.