H3C S7500 Series Ethernet Switches Command Manual

Command Manual – MSTP
H3C S7500 Series Ethernet Switches Chapter 1
MSTP Configuration Commands
1-33
By default, a switch uses the legacy standard to calculate the default path costs of
ports.
Table 1-4 Transmission speeds and the corresponding path costs
Transmiss
ion speed
Operation mode
(half-/full-duplex)
802.1D-1998 IEEE 802.1t
Standard
defined by
Private
0
—
65535 200,000,000 200,000
10 Mbps
Half-Duplex/Full-Duple
x
Aggregated Link 2
Ports
Aggregated Link 3
Ports
Aggregated Link 4
Ports
100
95
95
95
2,000,000
1,000,000
666,666
500,000
2,000
1,800
1,600
1,400
100 Mbps
Half-Duplex/Full-Duple
x
Aggregated Link 2
Ports
Aggregated Link 3
Ports
Aggregated Link 4
Ports
19
15
15
15
200,000
100,000
66,666
50,000
200
180
160
140
1000 Mbps
Full-Duplex
Aggregated Link 2
Ports
Aggregated Link 3
Ports
Aggregated Link 4
Ports
4
3
3
3
20,000
10,000
6,666
5,000
20
18
16
14
10 Gbps
Full-Duplex
Aggregated Link 2
Ports
Aggregated Link 3
Ports
Aggregated Link 4
Ports
2
1
1
1
2,000
1,000
666
500
2
1
1
1
Normally, when a port operates in full-duplex mode, the corresponding path cost is
slightly less than that when the port operates in half-duplex mode.
When calculating the path cost of an aggregated link, the 802.1D-1998 standard does
not take the number of the ports on the aggregated link into account, whereas the