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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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