2-439
Cisco Catalyst Blade Switch 3030 Command Reference
78-17262-01
Chapter 2 Cisco
Catalyst
Blade Switch 3030 Cisco IOS Commands
spanning-tree cost
spanning-tree cost
Use the
spanning-tree cost
interface configuration
command to set the path cost for spanning-tree
calculations. If a loop occurs, spanning tree considers the path cost when selecting an interface to place
in the forwarding state. Use the
no
form of this command to return to the default setting.
spanning-tree
[
vlan
vlan-id
]
cost
cost
no spanning-tree
[
vlan
vlan-id
]
cost
Syntax Description
Defaults
The default path cost is computed from the interface bandwidth setting. These are the IEEE default path
cost values:
•
1000 Mbps—4
•
100 Mbps—19
•
10 Mbps—100
Command Modes
Interface configuration
Command History
Usage Guidelines
When you configure the cost, higher values represent higher costs.
If you configure an interface with both the
spanning-tree vlan
vlan-id
cost
cost
command and the
spanning-tree cost
cost
command, the
spanning-tree vlan
vlan-id
cost
cost
command takes effect.
Examples
This example shows how to set the path cost to 250 on a port:
Switch(config)#
interface gigabitethernet0/1
Switch(config-if)#
spanning-tree cost 250
This example shows how to set a path cost to 300 for VLANs 10, 12 to 15, and 20:
Switch(config-if)#
spanning-tree vlan 10,12-15,20 cost 300
You can verify your settings by entering the
show spanning-tree interface
interface-id
privileged
EXEC command.
vlan
vlan-id
(Optional) VLAN range associated with a spanning-tree instance. You can specify
a single VLAN identified by VLAN ID number, a range of VLANs separated by a
hyphen, or a series of VLANs separated by a comma. The range is 1 to 4094.
cost
Path cost. The range is 1 to 200000000, with higher values meaning higher costs.
Release
Modification
12.2(25)SEE
This command was introduced.