Spanning-Tree Mst Port-Priority - Cisco Catalyst 2960 Command Reference Manual
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Chapter 2 Catalyst 2960 Switch Cisco IOS Commands
spanning-tree mst port-priority
Use the spanning-tree mst port-priority interface configuration command 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)FX
12.2(25)SED
Usage Guidelines
You can assign higher priority values (lower numerical values) to interfaces that you want selected first
and lower priority values (higher numerical values) that you want selected last. If all interfaces 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-8604-04
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 1 to 4094.
spanning-tree mst port-priority
Catalyst 2960 Switch Command Reference
2-512
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