Owner's manual

Spanning-Tree Commands
Page 271
spanning-tree mst cost
The spanning-tree mst cost Interface Configuration mode command configures the path cost for multiple
spanning tree (MST) calculations. If a loop occurs, the spanning tree considers path cost when selecting an
interface to put in the forwarding state. Use the no form of this command to return to the default configuration.
Syntax
spanning-tree mst instance-id cost cost
no spanning-tree mst instance-id cost
Parameters
•
instance-ID—ID of the spanning -tree instance (Range: 1- 15).
• cost—The port path cost. (Range: 1 - 200,000,000)
Default Configuration
Default path cost is determined by port speed and path cost method (long or short) as shown below:
Command Modes
Interface Configuration (Ethernet, port-channel) mode
User Guidelines
There are no user guidelines for this command.
Example
The following example configures the MSTP instance 1 path cost for Ethernet port 1/g16 to 4.
spanning-tree mst configuration
The spanning-tree mst configuration Global Configuration mode command enables configuring an MST region
by entering the Multiple Spanning Tree (MST) mode.
Syntax
spanning-tree mst configuration
Parameters
This command has no arguments or keywords.
Interface Long Short
Port-channel 20,000 4
Gigabit Ethernet (1000 Mbps) 20,000 4
Fast Ethernet (100 Mbps) 200,000 19
Ethernet (10 Mbps) 2,000,000 100
console(config) # interface ethernet 1/g16
console(config-if) # spanning-tree mst 1 cost 4