Configuring The Rapid Pvst+ Path-Cost Method And Port Cost; Configuring The Rapid Pvst+ Bridge Priority Of A Vlan - Cisco Nexus 3000 Series Configuration Manual

Configuring Rapid PVST+

Configuring the Rapid PVST+ Path-Cost 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 path-cost method, and you can configure the
method in either the interface or configuration submode.The default path-cost method is short.
Procedure
Step 1
Step 2
Step 3
Step 4
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.
OL-29545-03
Command or Action
switch# configure terminal
switch(config)# spanning-tree
pathcost method {long | short}
switch(config)# interface type
slot/port
switch(config-if)# spanning-tree
[vlan vlan-id] cost [value | auto]
Cisco Nexus 3000 Series NX-OS Layer 2 Switching Configuration Guide, Release 6.x
Configuring the Rapid PVST+ Path-Cost Method and Port Cost
Purpose
Enters global configuration mode.
Selects the method used for Rapid PVST+ path-cost
calculations. The default method is the short method.
Specifies the interface to configure, and enters interface
configuration mode.
Configures the port cost for the LAN interface. The cost
value, depending on the path-cost 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
path-cost calculation method and the media speed.
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