Configuring The Path Cost - Cisco Catalyst 2950 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
The show spanning-tree interface interface-id privileged EXEC command displays information only
Note
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.
Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
13-18
Purpose
Configure the port priority for an interface.
For priority, the range is 0 to 240 in increments of 16. The
default is 128. The lower the number, the higher the
priority.
Valid priority values are 0, 16, 32, 48, 64, 80, 96, 112, 128,
144, 160, 176, 192, 208, 224, and 240. All other values are
rejected.
Configure the VLAN port priority for an interface.
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 priority, the range is 0 to 240 in increments of 16.
The default is 128. The lower the number, the higher
the priority.
Valid priority values are 0, 16, 32, 48, 64, 80, 96, 112,
128, 144, 160, 176, 192, 208, 224, and 240. All other
values are rejected.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
"Load Sharing Using STP" section on page
Chapter 13 Configuring STP
16-21.
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