Cisco Catalyst 2950 Software Configuration Manual page 252

Configuring Spanning-Tree Features
Beginning in privileged EXEC mode, follow these steps to configure the cost of an interface:
Command
Step 1
configure terminal
Step 2
interface interface-id
Step 3
spanning-tree cost cost
Step 4
spanning-tree vlan vlan-id cost cost
Step 5 end
Step 6 show spanning-tree interface interface-id
or
show spanning-tree vlan vlan-id
Step 7
copy running-config startup-config
Note The show spanning-tree interface interface-id privileged EXEC command displays information only
for ports that are in a link-up operative state. Otherwise, you can use the show running-config privileged
EXEC command to confirm the configuration.
To return the interface to its default setting, use the no spanning-tree [vlan vlan-id] cost interface
configuration command. For information on how to configure load sharing on trunk ports using
spanning-tree path costs, see the
Catalyst 2950 Desktop Switch Software Configuration Guide
10-16
Purpose
Enter global configuration mode.
Enter interface configuration mode, and specify an interface to
configure. Valid interfaces include physical interfaces and
port-channel logical interfaces (port-channel
port-channel-number).
Configure the cost for an interface that is an access port.
If a loop occurs, spanning tree uses the path cost when selecting
an interface to place into the forwarding state. A lower path cost
represents higher-speed transmission.
For cost, the range is 1 to 200000000; the default value is derived
from the media speed of the interface.
Configure the VLAN cost for an interface that is a trunk port.
If a loop occurs, spanning tree uses the path cost when selecting
an interface to place into the forwarding state. A lower path cost
represents higher-speed transmission.
For vlan-id, the range is 1 to 4094 when the enhanced
•
software image is installed and 1 to 1005 when the standard
software image is installed. Do not enter leading zeros.
For cost, the range is 1 to 200000000; the default value is
•
derived from the media speed of the interface.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
"Load Sharing Using STP" section on page
Chapter 10 Configuring STP
13-26.
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