Spanning-Tree Port-Priority - Cisco ME 3400 Command Reference Manual

spanning-tree port-priority

spanning-tree port-priority
Use the spanning-tree port-priority interface configuration command on a network node interface
(NNI) or an enhanced network interface (ENI) on which Spanning Tree Protocol (STP) has been enabled
to configure an interface priority. If a loop occurs, spanning tree can find the interface to put in the
forwarding state. Use the no form of this command to return to the default setting.
Syntax Description vlan vlan-id
priority
Defaults The default is 128.
Command Modes Interface configuration
Command History Release
12.2(25)EX
Usage Guidelines STP is not supported on user network interfaces (UNIs). You can configure spanning-tree port priority
only on NNIs or on ENIs on which STP has been enabled. To set a port as an ENI or NNI, enter the
port-type {eni | nni} interface configuration command. To enable STP on an ENI, enter the
spanning-tree interface configuration command.
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.
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
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spanning-tree [vlan vlan-id] port-priority priority
no spanning-tree [vlan vlan-id] port-priority
(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.
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.
Modification
This command was introduced.
Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
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