HP 445942-001 manual Parameter, Description

Information Commands

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 24 Rapid Spanning Tree parameter descriptions

Parameter

Current Root

Path-Cost

Port

Priority (bridge)

Hello

Description

Shows information about the root bridge for the Spanning Tree. Information includes the priority (hex) and MAC address of the root.

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).

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.

The bridge priority parameter controls which bridge on the network will become the STP root bridge.

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

FwdDel

Aging

Priority (port)

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.

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.

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.

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.
	Shows the current state of the port. The State field in RSTP/MSTP mode can be one of
State
	the following: Discarding (DISC), Learning (LRN), Forwarding (FWD), or Disabled
	(DSB).

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