19-109
ports
aggregation link with 4
ports
10Gbps
Full- duplex
aggregation link with 2
ports
aggregation link with 3
ports
aggregation link with 4
ports
2
1
1
1
2,000
1,000
666
500
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
19.1.21 spanning-tree cost-format
Command:
spanning-tree cost-format {dot1d | dot1t}
Function:
In global mode, users can select path-cost format with dot1d or dot1t, the default format is dot1t.
Command Mode:
Global mode.
Default:
count path-cost with dot1t format.
Usage Guide:
There are two formats about cost value: they are dot1d marked on IEEE802.1d-2008 and dot1t marked on
IEEE802.1t, but path-cost ranges of them are different, dot1d range from 1 to 65535, and dot1t range from 1 to
200,000,000.