Table 9-6 Default Port Costs According to IEEE
Ethernet Speed
IEEE Cost: 1998 (and Before)
IEEE Cost: 2004 (and After)
10 Mbps
100
2,000,000
100 Mbps
19
200,000
1 Gbps
4
20,000
10 Gbps
2
2000
100 Gbps
N/A
200
1 Tbps
N/A
20
Of note in regards to these defaults, the cost defaults based on the operating speed of the
link, not the maximum speed. That is, if a 10/100/1000 port runs at 10 Mbps for some rea-
son, its default STP cost on a Cisco switch is 100, the default cost for an interface running
at 10 Mbps. Also, if you prefer the defaults in the right-side column of Table 9-6, note that
Cisco Catalyst switches can be configured to use those values as defaults with a single global
configuration command on each switch (spanning-tree pathcost method long).
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