3Com MSR 50 Series, Руководство по настройке

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464 C
HAPTER
23: MSTP C
ONFIGURATION
Configuring the
Network Diameter of a
Switched Network
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:
n
■
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
Configuring Timers of
MSTP
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:
These three timers set on the root bridge of the CIST apply on all the devices on
the entire switched network.
c
CAUTION:
■
The length of the forward delay time is related to the network diameter of the
switched network. Typically, the larger the network diameter is, the longer the
To do... Use the command... Remarks
Enter system view system-view -
Configure the network diameter of the
switched network stp bridge-diameter
bridge-number
Optional
7 by default
To do... Use the command... Remarks
Enter system view system-view -
Configure the forward delay
timer stp timer forward-delay
centi-seconds
Optional
1,500 centiseconds (15
seconds) by default
Configure the hello time timer stp timer hello centi-seconds Optional
200 centiseconds (2 seconds)
by default
Configuring the max age
timer stp timer max-age
centi-seconds
Optional
2,000 centiseconds (20
seconds) by default