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SMC Networks SMC TigerStack 1000 SMC8748M User Manual

Page 502

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C

OMMAND

L

INE

I

NTERFACE

4-230

Default Setting

By default, the system automatically detects the speed and duplex mode
used on each port, and configures the path cost according to the values
shown below. Path cost “0” is used to indicate auto-configuration
mode.
• Ethernet – half duplex: 2,000,000; full duplex: 1,000,000;

trunk: 500,000

• Fast Ethernet – half duplex: 200,000; full duplex: 100,000;

trunk: 50,000

• Gigabit Ethernet – full duplex: 10,000; trunk: 5,000

Command Mode

Interface Configuration (Ethernet, Port Channel)

Command Usage

• Each spanning-tree instance is associated with a unique set of VLAN

IDs.

• This command is used by the multiple spanning-tree algorithm to

determine the best path between devices. Therefore, lower values
should be assigned to interfaces attached to faster media, and higher
values assigned to interfaces with slower media.

• Path cost takes precedence over interface priority.

Example

Related Commands

spanning-tree mst port-priority (4 -231)

Console(config)#interface ethernet ethernet 1/5
Console(config-if)#spanning-tree mst 1 cost 50
Console(config-if)#

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