17-19
Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter17 Configuring STP Configuring Spanning-Tree Features
Note If your switch is a member of a switch stack, you must us e th e spanning-tree [vlan vlan-id] cost cost
interface configuration command instead of the spanning-tree [vlan vlan-id] port-priority priority
interface configuration command to select an interface to put in the forwarding state. Assign lower cost
values to interfaces that you want selected first and higher cost values that you want selected last. For
more information, see the “Configuring Path Cost” section on page17-20 .
Beginning in privileged EXEC mode, follow these steps to configure the port priority of an interface.
This procedure is optional.
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, y ou can use th e show running-config interface
privileged EXEC command to confirm the configuration.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 interface interface-id Specify an interface to configure, and enter interface
configuration mode.
Valid interfaces include physical ports and port-channel
logical interfaces (port-channel port-channel-number).
Step3 spanning-tree port-priority priority Configure the port priority for an interface.
For priority, the range is 0 to 240, in increments of 16; the
default is 128. Valid values are 0, 16, 32, 48, 64, 80, 96,
112, 128, 144, 160, 176, 192, 208, 224, and 240. All other
values are rejected. The lower the number, the higher the
priority.
Step4 spanning-tree vlan vlan-id port-priority priority Configure the port priority for a VLAN.
•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. Valid values are 0, 16, 32, 48, 64, 80,
96, 112, 128, 144, 160, 176, 192, 208, 224, and 240.
All other values are rejected. The lower the number,
the higher the priority.
Step5 end Return to privileged EXEC mode.
Step6 show spanning-tree interface interface-id
or
show spanning-tree vlan vlan-id
Verify your entries.
Step7 copy running-config startup-config (Optional) Save your entries in the configuration file.