Spanning-Tree Cost - Cisco Catalyst 2960 Command Reference Manual

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spanning-tree cost

Use the spanning-tree cost interface configuration command 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 gigabitethernet0/1

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

This example shows how to set a path cost to 300 for VLANs 10, 12 to 15, and 20:

Switch(config-if)# spanning-tree vlan 10,12-15,20 cost 300

You can verify your settings by entering the show spanning-tree interface interface-id privileged

EXEC command.

Catalyst 2960 Switch Command Reference

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.

Chapter 2 Catalyst 3750 Switch Cisco IOS Commands

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