H3C H3C S5100-SI, Operation Manual, Page: 214 / 830

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Configuring the Network Diameter of the Switched Network
In a switched network, any two switches can communicate with each other through a specific path
made up of multiple switches. The network diameter of a network is measured by the number of
switches; it equals the number of the switches on the longest path (that is, the path containing the
maximum number of switches).
Configuration procedure
Follow these steps to configure the network diameter of the switched network:
To do... Use the command... Remarks
Enter system view
system-view
—
Configure the network diameter
of the switched network
stp bridge-diameter
bridgenumber
Required
The default network diameter of
a network is 7.
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.
Configuration example
# Configure the network diameter of the switched network to 6.
<Sysname> system-view
[Sysname] stp bridge-diameter 6
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.
Configuration procedure
Follow these steps to configure MSTP time-related parameters:
To do... Use the command... Remarks
Enter system view
system-view
—
Configure the forward delay
parameter
stp timer forward-delay
centiseconds
Required
The forward delay parameter
defaults to 1,500 centiseconds
(namely, 15 seconds).
Configure the hello time
parameter
stp timer hello centiseconds
Required
The hello time parameter defaults to
200 centiseconds (namely, 2
seconds).