Spanning-Tree Mst Port-Priority - Cisco Catalyst 2950 Command Reference Manual

spanning-tree mst port-priority

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 determine which interface to
put in the forwarding state. Use the no form of this command to return to the default setting.
This command is available only if your switch is running the enhanced software image (EI).
Syntax Description
instance-id
priority
Defaults
The default is 128.
Command Modes Interface configuration
Command History Release
12.1(9)EA1
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 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
instance 20 is placed into the forwarding state if a loop occurs:
Switch(config)# interface fastethernet0/2
Switch(config-if)# spanning-tree mst 20 port-priority 0
You can verify your settings by entering the show spanning-tree mst interface interface-id privileged
EXEC command.
Catalyst 2950 Desktop Switch Command Reference
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spanning-tree mst instance-id port-priority priority
no spanning-tree mst instance-id port-priority
ID associated with a spanning-tree instance. The range is 0 to 15.
Number from 0 to 255. The lower the number, the higher the priority.
Modification
This command was first introduced.
Chapter 2 Cisco IOS Commands
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