Cisco Systems N3KC3064TFAL3 Configuring the Rapid PVST+ Pathcost Method and Port Cost, Procedure

Configuring Rapid PVST+

Configuring the Rapid PVST+ Pathcost Method and Port Cost

Configuring the Rapid PVST+ Pathcost Method and Port Cost

On access ports, you assign port cost by the port. On trunk ports, you assign the port cost by VLAN; you can configure the same port cost on all the VLANs on a trunk.

Note In Rapid PVST+ mode, you can use either the short or long pathcost method, and you can configure the method in either the interface or configuration submode.The default pathcost method is short.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# spanning-tree	Selects the method used for Rapid PVST+ pathcost
	pathcost method {long short}	calculations. The default method is the short method.
Step 3	switch(config)# interface type	Specifies the interface to configure, and enters interface
	slot/port	configuration mode.
Step 4	switch(config-if)# spanning-tree	Configures the port cost for the LAN interface. The cost
	[vlan vlan-id]cost [value auto]	value, depending on the pathcost calculation method, can
		be as follows:
		• short—1 to 65535
		• long—1 to 200000000
		Note	You configure this parameter per interface on
			access ports and per VLAN on trunk ports.
		The default is auto , which sets the port cost on both the
		pathcost calculation method and the media speed.

This example shows how to configure the access port cost of an Ethernet interface:

switch# configure terminal

switch (config)# spanning-tree pathcost method long switch (config)# interface ethernet 1/4 switch(config-if)#spanning-tree cost 1000

You can only apply this command to a physical Ethernet interface.

Configuring the Rapid PVST+ Bridge Priority of a VLAN

You can configure the Rapid PVST+ bridge priority of a VLAN.

Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)

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