Configuration Guide 232
Configuring Spanning Tree MSTP Configurations
MST-Instance Vlans-Mapped
---------------- ------------------------------------------------------------
0 1,7-4094
5 2-6,
----------------------------------------------------------------------------
Switch(config-mst)#end
Switch#copy running-config startup-config

Configuring the Parameters on Ports in Instance
Follow these steps to configure the priority and path cost of ports in the specified instance:
Step 1 configure
Enter global configuration mode.
Step 2 interface {gigabitEthernet
port
| range gigabitEthernet
port-list
] [port-channel
port-channel
|
range port-channel
port-channel-list
}
Enter interface configuration mode.
Step 3 spanning-tree mst instance
instance-id
{[ port-priority
pri
] | [ cost
cost
]}
Configure the priority and path cost of ports in the specified instance.
instance-id:
Specify the instance ID, the valid values ranges from 1 to 8.
pri:
Specify the priority of the port. The valid values are from 0 to 240, which are divisible by
16, and the default value is 128. The port with the lower value has the higher priority. In the
same condition, the port with the highest priority will be elected as the root port in the desired
instance.
cost:
Specify the path cost of the port. The valid values are from 0 to 2000000. By default, it is 0,
which means the port calculates the path cost automatically according to the port’s link speed.
It is the root path cost from the port to the root bridge in the specified instance. The port with
the lowest path cost will be elected as the root port in the desired instance.
Step 4 show spanning-tree mst { configuration [ digest ] | instance
instance-id
[ interface [
fastEthernet
port
| gigabitEthernet
port
| port-channel
lagid
] ] }
(Optional) View the related information of MSTP Instance.
digest:
Display digest calculated by instance-vlan map.
instance-id:
Specify the Instance ID desired to view, ranging from 1 to 8.
port:
Specify the port number.
lagid:
Specify the ID of the LAG.
Step 5 end
Return to privileged EXEC mode.
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