3Com WX3000 Configuring the Mstp Time-related Parameters, Stp bridge-diameter, Stp timer hello

To do…	Use the command…	Remarks
Enter system view	system-view	—
Configure the network diameter	stp bridge-diameter	Required
		The default network diameter of
of the switched network	bridgenumber
		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	—
		Required
Configure the forward	stp timer forward-delay	The forward delay parameter defaults to
delay parameter	centiseconds	1,500 centiseconds (namely, 15
		seconds).
Configure the hello time	stp timer hello	Required
		The hello time parameter defaults to 200
parameter	centiseconds
		centiseconds (namely, 2 seconds).
Configure the max age	stp timer max-age	Required
		The max age parameter defaults to 2,000
parameter	centiseconds
		centiseconds (namely, 20 seconds).

All devices in a switched network adopt the three time-related parameters configured on the CIST root bridge.

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