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Cisco Nexus 5000 Series Command Reference
OL-16599-01
Chapter 2 Ethernet Commands
spanning-tree mst cost
spanning-tree mst cost
To set the path-cost parameter for any Multiple Spanning Tree (MST) instance (including the common and
internal spanning tree [CIST] with instance ID 0) use the spanning-tree mst cost command. To return to
the default settings, use the no form of this command.
spanning-tree mst instance-id cost {cost | auto}
no spanning-tree mst instance-id cost
Syntax Description
Command Default Automatically set port cost values:
• 10 Mbps—2,000,000
• 100 Mbps—200,000
• 1-Gigabit Ethernet—20,000
• 10-Gigabit Ethernet—2,000
Command Modes Interface configuration mode
Command History
Usage Guidelines The port cost depends on the port speed; the faster interface speeds indicate smaller costs. MST always
uses long path costs.
Higher cost values indicate higher costs. When entering the cost, do not include a comma in the entry;
for example, enter 1000, not 1,000.
The EtherChannel bundle is considered a single port. The port cost is the aggregation of all the
configured port costs assigned to that channel.
Examples This example shows how to set the interface path cost:
switch(config-if)# spanning-tree mst 0 cost 17031970
instance-id Instance ID number; the range of valid values is from 0 to 4094.
cost Port cost for an instance; the range of valid values is from 1 to 200,000,000.
auto Sets the value of the port cost by the media speed of the interface.
Release Modification
4.0(0)N1(1a) This command was introduced.
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