C
HAPTER
33
| Spanning Tree Commands
– 1077 –
â—† 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.
â—† Use the no spanning-tree mst cost command to specify auto-
configuration mode.
â—† Path cost takes precedence over interface priority.
EXAMPLE
Console(config)#interface Ethernet 1/5
Console(config-if)#spanning-tree mst 1 cost 50
Console(config-if)#
RELATED COMMANDS
spanning-tree mst port-priority (1077)
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: 0-4094)
priority - Priority for an interface. (Range: 0-240 in steps of 16)
DEFAULT SETTING
128
COMMAND MODE
Interface Configuration (Ethernet, Port Channel)
COMMAND USAGE
â—† 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 interface with the highest priority (that is, lowest value)
will be configured as an active link in the spanning tree.
â—† Where more than one interface is assigned the highest priority, the
interface with lowest numeric identifier will be enabled.
EXAMPLE
Console(config)#interface Ethernet 1/5
Console(config-if)#spanning-tree mst 1 port-priority 0
Console(config-if)#
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