Cisco ME 3800X Spezifikationen PDF herunterladen (Seite 446)

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Cisco ME 3800X and ME 3600X Switch Command Reference

OL-23401-02

Chapter

spanning-tree cost

To set the path cost for spanning-tree calculations. use the spanning-tree cost command in interface

configuration

mode. If a loop occurs, spanning tree considers the path cost when selecting an interface

to place in the forwarding state. To return to the default setting, use the no form of this command.

spanning-tree [vlan vlan-id] cost cost

no spanning-tree [vlan vlan-id] cost

Syntax Description

Defaults The default path cost is computed from the STP interface bandwidth setting. These are the IEEE default

path cost values:

• 1000 Mbps—1

• 100 Mbps—10

• 10 Mbps—100

Command Modes Interface configuration

Command History

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

If you configure an STP port 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.

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

EXEC command.

Examples 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

vlan vlan-id (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.

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

Release Modification

12.2(52)EY This command was introduced.

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