PLANET XGS3-24040 - Manual (Page 203)

13-69
For the aggregation ports, the default costs are as below:
Port Type
Allowed Number Of
Aggregation Ports
Default Port Cost
10Mbps
N
2000000/N
100Mbps
N
200000/N
1Gbps
N
20000/N
10Gbps
N
2000/N
Usage Guide:
By setting the port cost, users can control the cost from the current port to the root bridge in order to
control the elections of root port and the designated port of the instance.
Example:
On the port1/2, set the MSTP port cost in the instance 2 to 3000000.
Switch(Config-If-Ethernet1/2)#spanning-tree mst 2 cost 3000000
13.1.16 spanning-tree mst port-priority
Command:
spanning-tree mst port-priority
no spanning-tree mst port-priority
Function:
Set the current port priority for the specified instance; the command “no spanning-tree mst
port-priority” restores the default setting.
Parameter:
sets the instance ID. The valid range is from 0 to 48; sets port
priority. The valid range is from 0 to 240. The value should be the multiples of 16, such as 0, 16,
32…240.