3Com MSR 50, MSR 30 manual Stp bridge-diameter, Stp compliance

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	<Sysname> system-view
	[Sysname] stp bpdu-protection
stp bridge-diameter
Syntax	stp bridge-diameter bridge-number
	undo stp bridge-diameter
View	System view
Parameters	bridge-number: Specifies the switched network diameter, in the range of 2 to 7.
Description	Use the stp bridge-diametercommand to specify the network diameter,
	namely the maximum number of stations between any two terminal devices on
	the switched network.
	Use the undo stp bridge-diametercommand to restore the default network
	diameter setting.
	By default, the network diameter of the switched network is 7.
	An appropriate setting of hello time, forward delay and max age can speed up
	network convergence. The values of these timers are related to the network size.
	You can set these three timers indirectly by setting the network diameter. Based on
	the network diameter you configured, MSTP automatically sets an optimal hello
	time, forward delay, and max age for the device. With the network diameter set to
	7 (the default), the three timer are also set to their defaults.
	Note that this configuration is effective for the CIST and root bridge only, and not
	for MSTIs.
Related commands:	stp timer forward-delay,stp timer hello, and stp timer max-age.
Examples	# Set the network diameter of the switched network to 5.
	<Sysname> system-view
	[Sysname] stp bridge-diameter 5
stp compliance
Syntax	stp compliance { auto dot1s legacy }
	undo stp compliance
View	Ethernet interface view, port group view
Parameters	auto: Configures the port(s) to recognize the MSTP BPDU format automatically
	and accordingly determine the format of MSTP BPDUs to send.