Spanning-Tree Mst Port-Priority - Cisco ME 3400 Command Reference Manual
Ethernet access switch
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Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
spanning-tree mst port-priority
Use the spanning-tree mst port-priority interface configuration command on a network node interface
(NNI) or enhanced network interface (ENI) with STP enabled to configure an interface priority. If a loop
occurs, the Multiple Spanning Tree Protocol (MSTP) 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
instance-id
priority
Defaults
The default is 128.
Command Modes
Interface configuration
Command History
Release
12.2(25)EX
12.2(25)SEG
Usage Guidelines
Spanning Tree Protocol (STP) is not supported on user network interfaces (UNIs). You can configure
spanning-tree MST 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.
You can assign higher priority values (lower numerical values) to STP port that you want selected first
and lower priority values (higher numerical values) that you want selected last. If all STP ports have the
same priority value, the multiple spanning tree (MST) puts the interface with the lowest interface number
in the forwarding state and blocks other interfaces.
Examples
This example shows how to increase the likelihood that the interface associated with spanning-tree
instances 20 and 22 is placed into the forwarding state if a loop occurs:
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# spanning-tree mst 20,22 port-priority 0
You can verify your settings by entering the show spanning-tree mst interface interface-id privileged
EXEC command.
OL-9640-10
spanning-tree mst instance-id port-priority priority
no spanning-tree mst instance-id port-priority
Range of spanning-tree instances. You can specify a single instance, a range of
instances separated by a hyphen, or a series of instances separated by a comma. The
range is 0 to 4094.
The range is 0 to 240 in increments of 16. Valid priority 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.
The instance-id range changed to 0 to 4094.
Cisco ME 3400 Ethernet Access Switch Command Reference
spanning-tree mst port-priority
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