Spanning-Tree Cost - Cisco Catalyst 3750 Command Reference Manual

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Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

spanning-tree cost

Use the spanning-tree cost interface configuration command on the switch stack or on a standalone

switch 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.

Syntax Description

vlan vlan-id

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

Usage Guidelines

When you configure the cost, higher values represent higher costs.

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.

This example shows how to set the path cost to 250 on a port:

Switch(config)# interface gigabitethernet2/0/1

Switch(config-if)# spanning-tree cost 250

spanning-tree [vlan vlan-id] cost cost

no spanning-tree [vlan vlan-id] cost

(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.

Path cost. The range is 1 to 200000000, with higher values meaning higher costs.

Modification

This command was introduced.

The value for the vlan-id variable was changed.

Catalyst 3750 Switch Command Reference

spanning-tree cost

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