H3C S7500E Series Command Manual page 224

Command Manual – MSTP
H3C S7500E Series Ethernet Switches
Parameters
dot1d-1998: The device calculates the default path cost for ports based on IEEE
802.1D-1998.
dot1t: The device calculates the default path cost for ports based on IEEE 802.1t.
legacy: The device calculates the default path cost for ports based on a private
standard.
Description
Use the stp pathcost-standard command to specify a standard for the device to use
when calculating the default path cost of the link connected with the device.
Use the undo stp pathcost-standard command to restore the system default.
The default standard used by the device is legacy.
Note that if you change the standard that the device uses in calculating the default path
cost, the port path cost value set through the stp cost command will be out of effect.
Table 1-9 Link speed vs. path cost
Link speed
0
10 Mbps
100 Mbps
1000 Mbps
10 Gbps
In the calculation of the path cost value of an aggregated link, 802.1D-1998 does not
take into account the number of ports in the aggregated link. Whereas, 802.1T takes
the number of ports in the aggregated link into account. The calculation formula is: Path
Duplex state
—
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
1-25
Chapter 1 MSTP Configuration Commands
802.1D-1998 IEEE 802.1t
65535 200,000,000
100 2,000,000
100 1,000,000
100 666,666
100 500,000
19 200,000
19 100,000
19 66,666
19 50,000
4 20,000
4 10,000
4 6,666
4 5,000
2 2,000
2 1,000
2 666
2 500
Private
standard
200,000
2,000
1,800
1,600
1,400
200
180
160
140
20
18
16
14
2
1
1
1