Spanning Tree port configuration

By default for STP/PVST+, Spanning tree is turned Off for downlink ports (1-16), and turned On for cross-connect ports (17-18), and uplink ports (20-24). By default for RSTP/MSTP, Spanning tree is turned On for all downlink ports (1-16), all cross-connect ports (17-18), and all uplink ports (20-24), 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 85 Spanning Tree Port Configuration commands

Command	Description
spanning-tree stp {<1-32>}	Configures the port priority. The port priority helps determine
priority {<0-255>}	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.
	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 {<1-32>} path- cost {<1-200000000>}

Configures the port path cost. The port path cost is used to help 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 10 for 100Mb/s ports, and 1 for Gigabit 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.

Command mode: Interface port

spanning-tree stp {<1-32>} link {autop2pshared}

Defines the type of link connected to the port, as follows:

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

[no] spanning-tree stp {<1-32>} edge

Enables or disables this port as an edge port. An edge port is not connected to a bridge, and can begin forwarding traffic as soon as the link is up. Configure server ports as edge ports (enabled).

This command only applies when RSTP is turned on. See the “Common Internal Spanning Tree configuration” section for more information.

Command mode: Interface port

spanning-tree stp {<1-32>}	Enables or disables Port Fast Forward on the port.
fastforward	Command mode: Interface port
spanning-tree stp {<1-32>} enable	Enables STP on the port.
	Command mode: Interface port
no spanning-tree stp {<1-32>}	Disables STP on the port.
enable	Command mode: Interface port
show interface gigabitethernet	Displays the current STP port parameters.
{<port number>} spanning-tree stp	Command mode: All
{<1-32>}

Configuration Commands 80

N8406-022 specifications

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