478 Spanning Tree Commands
Syntax
spanning-tree mst 
instance-id 
port-priority
 priority
no spanning-tree mst 
instance-id 
port-priority
•
instance-ID — 
ID of the spanning-tree instance. (Range: 1-15)
•
priority — 
The port priority. (Range: 0–240 in multiples of 16)
Default Configuration
The default port-priority for IEEE MSTP is 128.
Command Mode 
Interface Configuration (Ethernet, Port-Channel) mode
User Guidelines
This command has no user guidelines.
Example
The following example configures the port priority of port 1/g1 to 144.
console(config)#interface ethernet 1/g1
console(config-if-1/g1)#spanning-tree mst 1 port-priority 144
spanning-tree mst priority
Use the spanning-tree mst priority command in Global Configuration mode to set the switch 
priority for the specified spanning-tree instance. To return to the default setting, use the no 
form of this command.
Syntax
spanning-tree mst 
instance-id
 priority 
priority
no spanning-tree mst 
instance-id 
priority
•
instance-id — 
ID of the spanning-tree instance. (Range: 1-15)
•
priority — 
Sets the switch priority for the specified spanning-tree instance. This setting 
affects the likelihood that the switch is selected as the root switch. A lower value increases the 
probability that the switch is selected as the root switch. (Range: 0-61440)
Default Configuration
The default bridge priority for IEEE STP is 32768.