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Catalyst 2950 and Catalyst 2955 Switch Command Reference
0L-10102-01
Chapter 2 Catalyst 2950 and 2955 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:
• 10 Mbps—100
• 100 Mbps—19
• 155 Mbps—14
• 1000 Mbps—4
• 1 Gbps—4
• 10 Gbps—2
• Speeds greater than 10 Gbps—1
Command Modes Interface configuration
Command History
Usage Guidelines When you configure the cost, higher values represent higher costs.
You can set a cost on a VLAN that does not exist. The setting takes effect when the VLAN exists.
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 a path cost of 250 on an interface:
Switch(config)# interface fastethernet0/4
Switch(config-if)# spanning-tree cost 250
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 can range from 1 to 200000000, with higher values meaning higher costs.
Release Modification
12.0(5.2)WC(1) This command was introduced.
12.1(9)EA1 The range for the cost variable increased.
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