Spanning-Tree Mst Cost - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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Chapter 2 Cisco IOS Commands
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.
Syntax Description
instance-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
12.1(9)EA1
12.1(13)EA1
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 instances 2 and 4:
Switch(config)# interface fastethernet0/4
Switch(config-if)# spanning-tree mst 2,4 cost 250
You can verify your settings by entering the show spanning-tree mst interface interface-id privileged
EXEC command.
78-11195-09
spanning-tree mst instance-id cost cost
no spanning-tree mst instance-id cost
Range of spanning-tree instances. You can specify a single instance, a range of
instances separated by a hyphen, or a series of instances separated by a comma. The
range is 0 to 15.
Path cost is 1 to 200000000, with higher values meaning higher costs.
1000 Mbps—20000
100 Mbps—200000
10 Mbps—2000000
Modification
This command was first introduced.
The value for the instance-id variable was changed.
Catalyst 3550 Multilayer Switch Command Reference
spanning-tree mst cost
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