NEC N8406-022 manual Spanning Tree information, show spanning-treestp <1-32> information

Spanning Tree information

The following command displays Spanning Tree information:

show spanning-tree stp <1-32>information

Command mode: All

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upfast disabled, update 40

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Spanning Tree Group 1: On (STP/PVST+)

VLANs: 1

Current Root:			Path-Cost		Port	Hello MaxAge FwdDel			Aging
8000 00:02:a5:d1:0f:ed			8		20	2	20	15	180
Parameters: Priority Hello MaxAge FwdDel Aging
		32768	2	20	15		180
Port	Priority	Cost	FastFwd		State		Designated Bridge		Des Port
----	--------	----	--------		----------		--------------------- -------
1	0	0	n		FORWARDING *
2	0	0	n		FORWARDING *
3	0	0	n		FORWARDING *

The switch software uses the IEEE 802.1d Spanning Tree Protocol (STP). If RSTP/MSTP is turned on, see the “Rapid Spanning Tree information” section for Spanning Tree Group information. In addition to seeing if STP is enabled or disabled, you can view the following STP bridge information:

•Status of Uplink Fast (upfast)

•Current root MAC address

•Path cost

•Port

•Hello interval

•Maximum age value

•Forwarding delay

•Aging time

You can also refer to the following port-specific STP information:

•Port number and priority

•Cost

•State

•Port Fast Forwarding state

•Designated bridge

•Designated port

The following table describes the STP parameters.

Table 19 STP parameters

Parameter	Description
Current Root	Shows information about the root bridge for the Spanning Tree. Information includes the
	priority (hex) and MAC address of the root.
Path-Cost	Path-cost is the total path cost to the root bridge. It is the summation of the path cost
	between bridges (up to the root bridge).
Port	The current root port refers to the port on the switch that receives data from the current root.
	Zero (0) indicates the root bridge of the STP.
Priority	The bridge priority parameter controls which bridge on the network will become the STP root
(bridge)	bridge.
Hello	The hello time parameter specifies, in seconds, how often the root bridge transmits a
	configuration bridge protocol data unit (BPDU). Any bridge that is not the root bridge uses
	the root bridge hello value.
MaxAge	The maximum age parameter specifies, in seconds, the maximum time the bridge waits
	without receiving a configuration bridge protocol data unit before it reconfigures the STP
	network.

Information Commands 26