Configuring The Mstp Time-Related Parameters - 3Com 4500 Configuration Manual

To do...
Enter system view
Configure the network diameter
of the switched network
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...
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.
Use the command...
system-view
stp bridge-diameter
bridgenumber
Use the command...
system-view
stp timer forward-delay
centiseconds
stp timer hello centiseconds
stp timer max-age
centiseconds
1-23
Remarks
—
Required
The default network diameter of
a network is 7.
Remarks
—
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).