H3C Technologies H3C WX5500E Series Access Controllers User Manual
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Specifying a standard for the device to use when it calculates
the default path cost
CAUTION:
If you change the standard that the device uses to calculate the default path costs, you restore the path
costs to the default.
You can specify a standard for the device to use in automatic calculation of the default path cost. The
device supports the following standards:
•
dot1d-1998—The device calculates default path costs for ports based on IEEE 802.1d-1998.
•
dot1t—The device calculates default path costs for ports based on IEEE 802.1t.
•
legacy—The device calculates default path costs for ports based on a private standard.
shows a comparison between link speeds and path costs for each of these standards.
Table 13 Mappings between the link speed and the path cost
Link speed
Port type
Path cost
IEEE
802.1d-1998
IEEE 802.1t
Private standard
0 N/A
65535
200,000,000
200,000
10 Mbps
Single port
100
2,000,000 2000
Aggregate interface
containing 2 Selected ports
1,000,000 1800
Aggregate interface
containing 3 Selected ports
666,666 1600
Aggregate interface
containing 4 Selected ports
500,000 1400
100 Mbps
Single port
19
200,000 200
Aggregate interface
containing 2 Selected ports
100,000 180
Aggregate interface
containing 3 Selected ports
66,666 160
Aggregate interface
containing 4 Selected ports
50,000 140
1000 Mbps
Single port
4
20,000 20
Aggregate interface
containing 2 Selected ports
10,000 18
Aggregate interface
containing 3 Selected ports
6666 16
Aggregate interface
containing 4 Selected ports
5000 14