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Cisco ME 3400 Ethernet Access Switch Command Reference
OL-9640-07
Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
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.
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 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
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(25)EX This command was introduced.
- Reference 1
- CONTENTS 3
- Contents 10
- OL-9640-07 10
- A-11 13
- Audience 17
- Purpose 17
- Conventions 18
- Related Publications 18
- CLI Command Modes 21
- User EXEC Mode 22
- Privileged EXEC Mode 23
- Global Configuration Mode 23
- Interface Configuration Mode 24
- VLAN Configuration Mode 24
- Line Configuration Mode 24
- Ctrl-Z 25
- Cisco IOS Commands 27
- • The syntax for the FTP: 37
- • The syntax for the RCP: 37
- • The syntax for the TFTP: 37
- Switch# clear rep counters 77
- Switch# clear vmps statistics 81
- • module is always 0 87
- Switch# dot1x test timeout 27 111
- • service instance 126
- • ethernet uni 126
- • ethernet lmi t392 126
- • NTP broadcast service 166
- • NTP access restrictions 166
- • NTP authentication 166
- Transmission Control Protocol 293
- User Datagram Protocol 293
- • SPAN destination port 344
- • Private VLAN port 344
- • Tunnel port 344
- • Access port 344
- • cos—CoS value 362
- • dscp—DSCP value 364
- • Shutdown threshold 474
- • Drop threshold 474
- \ Command Description 523
- • 1000 Mbps—4 584
- • 100 Mbps—19 584
- • 10 Mbps—100 584
- command to display an 586
- • 1000 Mbps—20000 600
- • 100 Mbps—200000 600
- • 10 Mbps—2000000 600
- Ethernet ports 664
- Switch(config)# udld enable 675
- Switch# vmps reconfirm 692
- Switch(config)# vmps retry 7 694
- Boot Loader Commands 697
- • d—directory 704
- • r—readable 704
- • w—writable 704
- • x—executable 704
- [-test 707
- Debug Commands 723
- Show Platform Commands 803
- APPENDIX 851
- ) command A-11 858
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