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Catalyst 3750-X and 3560-X Switch Command Reference
OL-29704-01
Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
spanning-tree mst cost
spanning-tree mst cost
Use the spanning-tree mst cost interface configuration command on the switch stack or on a standalone
switch 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
Syntax Description
Defaults The default path cost is computed from the interface bandwidth setting. These are the IEEE default path
cost values:
• 1000 Mb/s—20000
• 100 Mb/s—200000
• 10 Mb/s—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 a port associated with instances 2 and 4:
Switch(config)# interface gigabitethernet1/0/2
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.
instance-id 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 4094.
cost Path cost is 1 to 200000000, with higher values meaning higher costs.
Release Modification
12.2(53)SE2 This command was introduced.
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