Configuration Guide (Supporting R2.2.0.0) Owner's manual

Brocade 6910 Ethernet Access Switch Configuration Guide 347
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Spanning Tree Commands
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” on page 347
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
• 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.
• 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)#