ECS4100 Series CLI Reference Guide-R07

Chapter 22 | Spanning Tree Commands
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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 (542)
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.