Spanning-Tree Cost - Cisco catalyst 3750 Command Reference Manual
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spanning-tree cost
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
cost
Defaults
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
Release
12.1(11)AX
12.1(14)EA1
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.
Examples
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
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 3750 Switch Command Reference
2-764
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.
1000 Mb/s—4
100 Mb/s—19
10 Mb/s—100
Modification
This command was introduced.
The value for the vlan-id variable was changed.
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
OL-8552-07
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