Reference Guide

308 Spanning-Tree Commands
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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
• The path cost method is configured using the spanning-tree pathcost method Global
Configuration mode command.
Example
The following example configures the spanning-tree cost on Ethernet port 1/e15 to 35000.
spanning-tree port-priority
The spanning-tree port-priority Interface Configuration mode command configures port
priority. To return to the default configuration, use the no form of this command.
Syntax
spanning-tree port-priority priority
no spanning-tree port-priority
• priority — The priority of the port. (Range: 0 - 240 in multiples of 16)
Default Configuration
The default port priority for IEEE Spanning TreeProtocol (STP) is 128.
Command Modes
Interface Configuration (Ethernet, port-channel) 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/e15
Console(config-if)# spanning-tree cost 35000