H3C Technologies H3C S10500 Series Switches - Manual (Page 96)

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NOTE:
When it calculates path cost for an aggregate interface, IEEE 802.1t takes into account the number of
Selected ports in its aggregation group, but IEEE 802.1d-1998 does not. The calculation formula of IEEE
802.1t is: Path cost = 200,000,000/link speed (in 100 kbps), where link speed is the sum of the link speed
values of the Selected ports in the aggregation group.
Table 14 Mappings between the link speed and the path cost
Path cost
Link speed Port type
IEEE 802.1d-1998 IEEE 802.1t Private standard
0 — 65535 200,000,000 200,000
Single port 2,000,000 2000
Aggregate interface
containing 2 Selected ports
1,000,000 1800
Aggregate interface
containing 3 Selected ports
666,666 1600
10 Mbps
Aggregate interface
containing 4 Selected ports
100
500,000 1400
Single port 200,000 200
Aggregate interface
containing 2 Selected ports
100,000 180
Aggregate interface
containing 3 Selected ports
66,666 160
100 Mbps
Aggregate interface
containing 4 Selected ports
19
50,000 140
Single port 20,000 20
Aggregate interface
containing 2 Selected ports
10,000 18
Aggregate interface
containing 3 Selected ports
6666 16
1000 Mbps
Aggregate interface
containing 4 Selected ports
4
5000 14
Single port 2000 2
Aggregate interface
containing 2 Selected ports
1000 1
Aggregate interface
containing 3 Selected ports
666 1
10 Gbps
Aggregate interface
containing 4 Selected ports
2
500 1
Configuring path costs of ports
Follow these steps to configure the path cost of ports: