C
HAPTER
33
| Spanning Tree Commands
– 802 –
shown below. Path cost “0” is used to indicate auto-configuration mode.
When the short path cost method is selected and the default path cost
recommended by the IEEE 8021w standard exceeds 65,535, the default is
set to 65,535. The default path costs are listed in Table 105 on page 797.
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.
◆ Use the no spanning-tree mst cost command to specify auto-
configuration mode.
◆ 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 (802)
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, 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)
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