Command Manual – MSTP
H3C S7500E Series Ethernet Switches
Chapter 1 MSTP Configuration Commands
1-25
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
Duplex state
802.1D-1998
IEEE 802.1t
Private
standard
0 —
65535
200,000,000
200,000
10 Mbps
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
100
100
100
100
2,000,000
1,000,000
666,666
500,000
2,000
1,800
1,600
1,400
100 Mbps
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
19
19
19
19
200,000
100,000
66,666
50,000
200
180
160
140
1000 Mbps
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
4
4
4
4
20,000
10,000
6,666
5,000
20
18
16
14
10 Gbps
Single Port
Aggregated Link 2 Ports
Aggregated Link 3 Ports
Aggregated Link 4 Ports
2
2
2
2
2,000
1,000
666
500
2
1
1
1
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
