3Com 3CBLSF26H manual Bpdu

Table 3-25STP Global Setup Page item description

	Item			Description
				Defines whether STP is enabled on the switch. The possible field
		Spanning Tree		values are:
				z Disable: Disables STP and RSTP on the switch.
		State
				z Classic: Enables STP on the switch.
				z RSTP: Enables RSTP on the switch.
				Determines how BPDU packets are managed when STP is
				disabled on the port or switch. BPDUs are used to transmit
		BPDU		spanning tree information. The possible field values are:
				z Filtering: Filters BPDU packets when spanning tree is disabled
Global		Handling
				on an interface.
Settings				z Flooding: Floods BPDU packets when spanning tree is
				disabled on an interface. This is the default value.
			Specifies the method used to assign default path cost to STP
			ports. The possible field values are:
		Path Cost		z Short: Specifies 1 through 65535 ranges for port path cost. This
				is the default value.
		Default Values		z Long: Specifies 1 through 200000000 ranges for port path cost.
				The default path cost assigned to an interface varies according
				to the selected method (Hello Time, Max Age, or Forward
				Delay).
				Specifies the bridge priority value. When switches or bridges are
		Priority		running STP, each is assigned a priority. After exchanging
				BPDUs, the switch with the lowest priority value becomes the Root
				Bridge. The field range is 0-61440. The default value is 32768. The
				port priority value is provided in increments of 4096.
				Specifies the switch Hello Time. The Hello Time indicates the
		Hello Time		amount of time in seconds a Root Bridge waits between
Bridge				configuration messages. The default is 2 seconds.
Settings				Specifies the switch Maximum Age Time. The Maximum Age Time
		Max Age		is the amount of time in seconds a bridge waits before sending
				configuration messages. The default Maximum Age Time is 20
				seconds.
			Specifies the switch Forward Delay Time. The Forward Delay
		Forward Delay	Time is the amount of time in seconds a bridge remains in a
			listening and learning state before forwarding packets. The default
			is 15 seconds.
		Bridge ID	Identifies the Bridge priority and MAC address.
		Root Bridge ID	Identifies the Root Bridge priority and MAC address.
				Indicates the port number that offers the lowest cost path from this
		Root Port		bridge to the Root Bridge. This field is significant when the bridge
				is not the Root Bridge. The default is zero.
Designated		Root Path Cost		Indicates the cost of the path from this bridge to the Root Bridge.
Root
		Topology		Indicates the total amount of STP state changes that have
		Changes
				occurred.
		Counts
		Last Topology	Indicates the amount of time that has elapsed since the bridge was
			initialized or reset, and the last topographic change that occurred.
		Change	The time is displayed in a day-hour-minute-second format, such as
			2 days 5 hours 10 minutes and 4 seconds.
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