Spanning Tree Protocol Default Port Cost

[ IEEE | Cisco ]


IEEE 802.1D Path Cost Parameter Values

Link SpeedRecommended
Value
Recommended
Range
Range
4 Mbps 250 100-10001-65535
10 Mbps 100 50-6001-65535
16 Mbps 62 40-4001-65535
100 Mbps 19 10-601-65535
1 Gbps 4 3-101-65535
10 Gbps 2 1-51-65535

IEEE 802.1t Path Cost Parameter Values

Link SpeedRecommended
Value
Recommended
Range
Range
10 Mbps 2.000.000 200.000-20.000.0001-200.000.000
100 Mbps 200.000 20.000-2.000.0001-200.000.000
1 Gbps 20.000 2.000-200.0001-200.000.000
10 Gbps 2.000 200-20.0001-200.000.000
100 Gbps 200 20-2.0001-200.000.000
1 Tbps 20 2-2001-200.000.000
10 Tbps 2 1-201-200.000.000

Default Observed on Cisco Switches

Speed Port CostComment
10 Mbps 100Ethernet
20 Mbps 56EtherChannel
30 Mbps 47EtherChannel
40 Mbps 41EtherChannel
50 Mbps 35EtherChannel
54 Mbps 33802.11 wireless
60 Mbps 30EtherChannel
70 Mbps 26EtherChannel
80 Mbps 23EtherChannel
100 Mbps 19Fast Ethernet
200 Mbps 12Fast EtherChannel
300 Mbps 9Fast EtherChannel
400 Mbps 8Fast EtherChannel
500 Mbps 7Fast EtherChannel
600 Mbps 6Fast EtherChannel
700 Mbps 5Fast EtherChannel
800 Mbps 5Fast EtherChannel
1 Gbps 4Gigabit Ethernet
2 Gbps 3Gigabit EtherChannel
10 Gbps 210G Ethernet
20 Gbps 120G EtherChannel
40 Gbps 140G EtherChannel

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