3Com Switch 4800G 24-Port Configuration Manual page 218

218 C 23: MSTP C
HAPTER
n
Configuring the
Network Diameter of a
Switched Network
n
Configuring Timers of
MSTP
ONFIGURATION
A larger maximum hops setting means a larger size of the MST region. Only the
maximum hops configured on the regional root bridge can restrict the size of the
MST region.
Configuration example
# Set the maximum hops of the MST region to 30.
<Sysname> system-view
[Sysname] stp max-hops 30
Any two stations in a switched network are interconnected through specific paths,
which are composed of a series of devices. Represented by the number of devices
on a path, the network diameter is the path that comprises more devices than any
other among these paths.
Configuration procedure
Follow these steps to configure the network diameter of the switched network:
To do...
Enter system view
Configure the network diameter of the
switched network
Network diameter is a parameter that indicates network size. A bigger network
■
diameter represents a larger network size.
Based on the network diameter you configured, MSTP automatically sets an
■
optimal hello time, forward delay, and max age for the device.
The configured network diameter is effective for the CIST only, and not for
■
MSTIs.
Configuration example
# Set the network diameter of the switched network to 6.
<Sysname> system-view
[Sysname] stp bridge-diameter 6
MSTP involves three timers: forward delay, hello time and max age. You can
configure these three parameters for MSTP to calculate spanning trees.
Configuration procedure
Follow these steps to configure the timers of MSTP:
To do...
Enter system view
Configure the forward delay
timer
Configure the hello time timer stp timer hello centi-seconds Optional
Use the command...
system-view
stp bridge-diameter bridge-number Optional
Use the command...
system-view
stp timer forward-delay
centi-seconds
Remarks
-
7 by default
Remarks
-
Optional
1,500 centiseconds (15
seconds) by default
200 centiseconds (2 seconds)
by default