Huawei Quidway S6500 Series - Page 526

Command Manual - STP
Quidway S6500 Series Ethernet Switches Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-25
By default, the switch calculates the default Path Cost of a port by the IEEE 802.1t
standard.
Table 1-4 Cost corresponding to the port speed of different standard.
Link
speed
Duplex state
dot1d-1998
value range
dot1t value
range
Huawei-3Com
cost value
0 - 65535 200,000,000 200,000
10Mb/s
Half-Duplex
Full-Duplex
Aggregated Link 2
Ports
Aggregated Link 3
Ports
Aggregated Link 4
Ports
100
99
95
95
95
2,000,000
1,999,999
1,000,000
666,666
500,000
2,000
2,000
1,800
1,600
1,400
100Mb/s
Half-Duplex
Full-Duplex
Aggregated Link 2
Ports
Aggregated Link 3
Ports
Aggregated Link 4
Ports
19
18
15
15
15
200,000
199,999
100,000
66,666
50,000
200
200
180
160
140
1000Mb/
s
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
10G/s
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
Generally the path cost of the links in full duplex status is lower than those in half duplex
status.
In calculating the path cost of aggregation links, the 802.1D-1998 does not take into
account the number of aggregation links, but the 802.1T does. The formula involved is:
Path Cost = 200,000,000/link speed in 100Kbps