Specifications

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Catalyst 2950 and Catalyst 2955 Switch Command Reference
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Chapter 2 Cisco IOS Commands
spanning-tree mst cost
spanning-tree mst cost
Use the spanning-tree mst cost interface configuration command to set the path cost for multiple
spanning-tree (MST) calculations. If a loop occurs, spanning tree considers the path cost when selecting
an interface to put in the forwarding state. Use the no form of this command to return to the default
setting.
spanning-tree mst instance-id cost cost
no spanning-tree mst instance-id cost
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
Defaults The default path cost is computed from the interface bandwidth setting. These are the IEEE default path
cost values:
• 1000 Mbps—20000
• 100 Mbps—200000
• 10 Mbps—2000000
Command Modes Interface configuration
Command History
Usage Guidelines When you configure the cost, higher values represent higher costs.
Examples This example shows how to set a path cost of 250 on an interface associated with instance 2:
Switch(config)# interface fastethernet0/4
Switch(config-if)# spanning-tree mst 2 cost 250
You can verify your settings by entering the show spanning-tree mst interface interface-id privileged
EXEC command.
instance-id ID associated with a spanning-tree instance. The range is 0 to 15.
cost Path cost is 1 to 200000000, with higher values meaning higher costs.
Release Modification
12.1(9)EA1 This command was first introduced.