HP BMD00022 manual Parameter Description

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

Table 23 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 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. If the bridge is not the root bridge, it uses the
	MaxAge value of the root bridge.
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. If
	the bridge is not the root bridge, it uses the FwdDel value of the root bridge.
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.
	MSTP: The Type field appears in /info/cist.
	Information Menu 45