H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 191)

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The bigger the maximum hop count, the larger the MST region is. Note that only the maximum hop
settings on the device operating as a region root can limit the size of the MST region.
Configuration example
# Configure the maximum hop count of the MST region to be 30.
<device> system-view
[device] stp max-hops 30
Configuring the Network Diameter of the Switched Network
In a switched network, any two devices can communicate with each other through a specific path made
up of multiple devices. The network diameter of a network is measured by the number of devices; it
equals the number of the devices on the longest path (that is, the path containing the maximum number
of devices).
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 device 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.
<device> system-view
[device] 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).