Spanning-Tree Cost - Cisco Catalyst 3030 Command Reference Manual

Chapter 2 Cisco Catalyst Blade Switch 3030 Cisco IOS Commands

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.
Syntax Description vlan vlan-id
cost
Defaults
The default path cost is computed from the interface bandwidth setting. These are the IEEE default path
cost values:
•
•
•
Command Modes Interface configuration
Command History Release
12.2(25)SEE
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.
78-17262-01
spanning-tree [vlan vlan-id] cost cost
no spanning-tree [vlan vlan-id] cost
(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.
Path cost. The range is 1 to 200000000, with higher values meaning higher costs.
1000 Mbps—4
100 Mbps—19
10 Mbps—100
Modification
This command was introduced.
Cisco Catalyst Blade Switch 3030 Command Reference
spanning-tree cost
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