mac

Commands for MSTP
231
Port Speed
Port Type
Port Cost
802.1D-2008
802.1T
0
65535
200,000,000
10Mbps
Half- duplex
Full- duplex
aggregation link with
2 ports
aggregation link with
3 ports
aggregation link with
4 ports
100
99
95
95
95
2,000,000
1,999,999
1,000,000
666,666
500,000
100Mbps
Half- duplex
Full- duplex
aggregation link with
2 ports
aggregation link with
3 ports
aggregation link with
4 ports
19
18
15
15
15
200,000
199,999
100,000
66,666
50,000
1000Mbps
Full- duplex
aggregation link with
2 ports
aggregation link with
3 ports
aggregation link with
4 ports
4
3
3
3
20,000
10,000
6,666
5,000
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