Command Line Interface
4-168
4
Default Setting
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 (4-168)
spanning-tree mst port-priority
This command configures the interface priority on a spanning instance in the
Multiple Spanning Tree. Use the no form to restore the default.
Syntax
spanning-tree mst instance_id port-priority priority
no spanning-tree mst instance_id port-priority
instance_id - Instance identifier of the spanning tree.
(Range: 1-4094, no leading zeroes)
priority - Priority for an interface. (Range: 0-240 in steps of 16)
Default Setting
128
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
This command defines the priority for the use of an interface in the multiple
spanning-tree. If the path cost for all interfaces on a switch are the same, the
Console(config)#interface ethernet ethernet 1/5
Console(config-if)#spanning-tree mst 1 cost 50
Console(config-if)#