Configuring The Mstp Time-Related Parameters - H3C S5100-SI Series Operation Manual

Operation Manual – MSTP
H3C S5100-SI/EI Series Ethernet Switches
The network diameter parameter indicates the size of a network. The bigger the
network diameter is, the larger the network size is.
After you configure the network diameter of a switched network, an MSTP-enabled
switch adjusts its hello time, forward delay, and max age settings accordingly to better
values.
The network diameter setting only applies to CIST; it is invalid for MSTIs.
II. Configuration example
# Configure the network diameter of the switched network to 6.
<Sysname> system-view
[Sysname] stp bridge-diameter 6

1.3.9 Configuring the MSTP Time-related Parameters

Three MSTP time-related parameters exist: forward delay, hello time, and max age.
You can configure the three parameters to control the process of spanning tree
calculation.
I. Configuration procedure
Follow these steps to configure MSTP time-related parameters:
Enter system view
Configure the forward
delay parameter
Configure the hello
time parameter
Configure the max age
parameter
All switches in a switched network adopt the three time-related parameters configured
on the CIST root bridge.
To do... Use the command...
system-view
stp timer forward-delay
centiseconds
stp timer hello
centiseconds
stp timer max-age
centiseconds
—
Required
The forward delay parameter
defaults to 1,500
centiseconds (namely, 15
seconds).
Required
The hello time parameter
defaults to 200 centiseconds
(namely, 2 seconds).
Required
The max age parameter
defaults to 2,000
centiseconds (namely, 20
seconds).
1-28
Chapter 1 MSTP Configuration
Remarks