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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. To return to the default configuration,
use the no form of this command.
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 - 16).
•
cost — The port path cost. (Range: 1 - 200,000,000)
Default Setting
Default path cost is determined by port speed and path cost method (long or short) as shown
below:
Interface
Port-channel
Gigabit Ethernet (1000 Mbps)
Fast Ethernet (100 Mbps)
Ethernet (10 Mbps)
Command Modes
Interface Configuration (Ethernet, port-channel) mode
Default Configuration
There is no default configuration for this command.
Example
The following example configures the MSTP instance 1 path cost for Ethernet port 1/e9 to 4.
Console(config) # interface ethernet 1/e9
Console(config-if) # spanning-tree mst 1 cost 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.
Long
Short
20,000
4
20,000
4
200,000
19
2,000,000
100
Spanning-Tree Commands
257
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