Cisco Catalyst 2950 Software Configuration Manual page 279

Chapter 13 Configuring STP
Beginning in privileged EXEC mode, follow these steps to configure the cost of an interface. This
procedure is optional.
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
The show spanning-tree interface interface-id privileged EXEC command displays information only
Note
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 by using
spanning-tree path costs, see the
78-11380-12
Purpose
Enter global configuration mode.
Specify an interface to configure, and enter interface
configuration mode. Valid interfaces include physical interfaces
and port-channel logical interfaces (port-channel
port-channel-number).
Configure the cost for an interface.
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 cost for a VLAN.
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, 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.
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
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
Configuring Spanning-Tree Features
16-21.
13-19