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Cisco ME 3800X and ME 3600X Switch Command Reference
OL-28238-01
Chapter
spanning-tree port-priority
spanning-tree port-priority
To configure an interface priority, use the spanning-tree port-priority command in interface
configuration mode. If a loop occurs, spanning tree can find the interface to put in the forwarding state.
To return to the default setting, use the no form of this command.
spanning-tree [vlan vlan-id] port-priority priority
no spanning-tree [vlan vlan-id] port-priority
Syntax Description
Defaults The default is 128.
Command Modes Interface configuration
Command History
Usage Guidelines If the variable vlan-id is omitted, the command applies to the spanning-tree instance associated with
VLAN 1.
You can set the priority on a VLAN that has no interfaces assigned to it. The setting takes effect when
you assign the STP port to the VLAN.
If you configure an STP port with both the spanning-tree vlan vlan-id port-priority priority command
and the spanning-tree port-priority priority command, the spanning-tree vlan vlan-id port-priority
priority command takes effect.
You can verify your settings by entering the show spanning-tree interface interface-id privileged
EXEC command.
Examples This example shows how to increase the likelihood that a port will be put in the forwarding state if a loop
occurs:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# spanning-tree vlan 20 port-priority 0
This example shows how to set the port-priority value on VLANs 20 to 25:
Switch(config-if)# spanning-tree vlan 20-25 port-priority 0
vlan vlan-id (Optional) VLAN range associated with a spanning-tree instance. 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.
priority Number from 0 to 240, in increments of 16. 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.
Release Modification
12.2(52)EY This command was introduced.
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