HP 445942-001 manual Spanning Tree port configuration, Link autop2pshared

Configuration Commands

When configuring STP bridge parameters, the following formulas must be used:

•2*(fwd-1) ≥ mxage

•2*(hello+1) ≤ mxage

Spanning Tree port configuration

The default configuration for STP/PVST+ is off for downlink ports (1-16) and the management port (17), and on for uplink ports (18-21). The default configuration for RSTP/MSTP is Spanning Tree off for all downlink ports (1-16) and the management port (17), and on for all uplink ports (18-21), with downlink ports configured as edge ports.

Spanning tree port parameters are used to modify STP operation on an individual port basis. STP port parameters include:

•Port priority

•Port path cost

The following table describes the Spanning Tree Port Configuration commands.

Table 110 Spanning Tree Port Configuration commands

Command	Description
spanning-tree stp {<1-128>}	Configures the port priority. The port priority helps determine which
priority {<0-255>}	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.
	The range is 0 to 255, and the default is 128.
	RSTP/MSTP: The range is 0 to 240, in steps of 16 (0, 16, 32...) and the
	default is 128.
	Command mode: Interface port
spanning-tree stp {<1-128>}	Configures the port path cost. The port path cost is used to help
path-cost {<1-65535>}	determine the designated port for a segment. Generally speaking, the
	faster the port, the lower the path cost.
	The range is 1 to 65535. The default is 100 for 10Mb ports, 10 for 100
	Mb ports, 4 for Gigabit ports, and 2 for 10Gb ports.
	A value of 0 indicates that the default cost will be computed for an auto-
	negotiated link speed.
	RSTP/MSTP: The range is 1 – 200000000, and the default it 20000 for
	Gigabit ports, 2000 for 10Gb ports.
	Command mode: Interface port
spanning-tree stp {<1-128>}	Defines the type of link connected to the port, as follows:
link {autop2pshared}	• auto—Configures the port to detect the link type, and automatically
	match its settings.
	• p2p—Configures the port for Point-To-Point protocol.
	• shared—Configures the port to connect to a shared medium (usually
	a hub).
	This command only applies when RSTP is turned on. See the “Common
	Internal Spanning Tree configuration” section for more information.
	Command mode: Interface port
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