Spanning-tree mst cost – Brocade Communications Systems Brocate Ethernet Access Switch 6910 User Manual
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Brocade 6910 Ethernet Access Switch Configuration Guide
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Spanning Tree Commands
18
Command Mode
Interface Configuration (Ethernet, Port Channel)
Example
Console(config)#interface ethernet 1/5
Console(config-if)#spanning-tree loopback-detection trap
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)
cost - Path cost for an interface. (Range: 0 for auto-configuration, 1-65535 for short path
cost method
8
, 1-200,000,000 for long path cost method)
The recommended path cost range is listed in
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
.
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)#
8. Use the
command to set the path cost method.