NEC N8406-022 manual •Status of Uplink Fast upfast

The switch software can be set to use the IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) or the IEEE 802.1s Multiple Spanning Tree Protocol (MSTP). If RSTP/MSTP is turned on, you can view the following RSTP bridge information for the Spanning Tree Group:

•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 RSTP information:

•Port number and priority

•Cost

•State

•Role

•Designated bridge and port

•Link type

The following table describes the STP parameters in RSTP or MSTP mode.

Table 20 Rapid Spanning Tree parameter descriptions

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 (bridge)	The bridge priority parameter controls which bridge on the network will become the STP
	root bridge.
Hello	The hello time parameter specifies, in seconds, how often the root bridge transmits a
	configurationbridge 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.
FwdDel	The forward delay parameter specifies, in seconds, the amount of time that a bridge port
	has to wait before it changes from learning state to forwarding state.
Aging	The aging time parameter specifies, in seconds, the amount of time the bridge waits
	without receiving a packet from a station before removing the station from the
	Forwarding Database.
Priority (port)	The port priority parameter helps determine which bridge port becomes the designated
	port. In a network topology that has multiple bridge ports connected to a single segment,
	the port with the lowest port priority becomes the designated port for the segment.
Cost	The port path cost parameter is used to help determine the designated port for a
	segment. Generally speaking, the faster the port, the lower the path cost. A setting of
	zero (0) indicates that the cost will be set to the appropriate default after the link speed
	has been auto-negotiated.
State	Shows the current state of the port. The State field in RSTP/MSTP mode can be one of
	the following: Discarding (DISC), Learning (LRN), Forwarding (FWD), or
	Disabled (DSB).
Role	Shows the current role of this port in the Spanning Tree. The port role can be one of the
	following: Designated (DESG), Root (ROOT), Alternate (ALTN), Backup (BKUP), Master
	(MAST), or Unknown (UNK).
Designated bridge	Shows information about the bridge connected to each port, if applicable. Information
	includes the priority (hex) and MAC address of the Designated Bridge.
Designated port	The port ID of the port on the Designated Bridge to which this port is connected.
Type	Type of link connected to the port, and whether the port is an edge port. Link type values
	are AUTO, P2P, or SHARED.

Information Commands 28