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S
PANNING
T
REE
C
OMMANDS
29-22
spanning-tree mst cost
This command configures the path cost on a spanning instance in the
Multiple Spanning Tree. Use the no form to restore the default
auto-configuration mode.
Syntax
spanning-tree mst instance_id cost cost
no spanning-tree mst instance_id cost
• instance_id - Instance identifier of the spanning tree.
(Range: 0-4094, no leading zeroes)
• cost - Path cost for an interface. (Range: 1-200,000,000)
(Range: 0 for auto-configuration, 1-65535 for short path cost
method
29
, 1-200,000,000 for long path cost method)
The recommended path cost range is listed in Table 29-2
on page 29-16. The recommended path cost is listed in
Table 29-3 on page 29-16.
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.
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 29-4 on
page 29-17.
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
29. Use the spanning-tree pathcost method command on page 29-9 to set the path cost method.