Spanning-Tree Commands 369
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
•
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 Mode
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/e9 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.
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/e9
Console(config-if) # spanning-tree mst 1 cost 4
book.book Page 369 Thursday, December 18, 2008 7:40 PM
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