Configuring The Path Cost - Cisco 2950G 24 - Catalyst Switch Software Configuration Manual

Configuring Spanning-Tree Features
Command
Step 3 spanning-tree port-priority priority
Step 4
spanning-tree vlan vlan-id port-priority priority
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
if the port is in a link-up operative state. Otherwise, you can use the show running-config interface
privileged EXEC command to confirm the configuration.
To return the interface to its default setting, use the no spanning-tree [vlan vlan-id] port-priority
interface configuration command. For information on how to configure load sharing on trunk ports by
using spanning-tree port priorities, see the

Configuring the Path Cost

The spanning-tree path cost default value is derived from the media speed of an interface. If a loop
occurs, spanning tree uses cost when selecting an interface to put in the forwarding state. You can assign
lower cost values to interfaces that you want selected first and higher cost values that you want selected
last. If all interfaces have the same cost value, spanning tree puts the interface with the lowest interface
number in the forwarding state and blocks the other interfaces.
Spanning tree uses the cost value when the interface is configured as an access port and uses VLAN port
cost values when the interface is configured as a trunk port.
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
Catalyst 2950 Desktop Switch Software Configuration Guide
11-16
Purpose
Configure the port priority for an interface that is an access
port.
For priority, the range is 0 to 255; the default is 128. The
lower the number, the higher the priority.
Configure the VLAN port priority for an interface that is a
trunk port.
• For vlan-id, the range is 1 to 4094 when the EI is
installed and 1 to 1005 when the SI is installed. Do not
enter leading zeros.
For priority, the range is 0 to 255; the default is 128.
•
The lower the number, the higher the priority.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
"Load Sharing Using STP" section on page
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).
Chapter 11 Configuring STP
14-21.
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