Spanning Tree Protocol Default Port Cost
IEEE 802.1D Path Cost Parameter Values
| Link Speed | Recommended | Recommended | Range |
| 4 Mbps | 250 | 100-1000 | 1-65535 |
| 10 Mbps | 100 | 50-600 | 1-65535 |
| 16 Mbps | 62 | 40-400 | 1-65535 |
| 100 Mbps | 19 | 10-60 | 1-65535 |
| 1 Gbps | 4 | 3-10 | 1-65535 |
| 10 Gbps | 2 | 1-5 | 1-65535 |
IEEE 802.1t Path Cost Parameter Values
| Link Speed | Recommended | Recommended | Range |
| 10 Mbps | 2.000.000 | 200.000-20.000.000 | 1-200.000.000 |
| 100 Mbps | 200.000 | 20.000-2.000.000 | 1-200.000.000 |
| 1 Gbps | 20.000 | 2.000-200.000 | 1-200.000.000 |
| 10 Gbps | 2.000 | 200-20.000 | 1-200.000.000 |
| 100 Gbps | 200 | 20-2.000 | 1-200.000.000 |
| 1 Tbps | 20 | 2-200 | 1-200.000.000 |
| 10 Tbps | 2 | 1-20 | 1-200.000.000 |
Default Observed on Cisco Switches
| Speed | Port Cost | Comment |
| 10 Mbps | 100 | Ethernet |
| 20 Mbps | 56 | EtherChannel |
| 30 Mbps | 47 | EtherChannel |
| 40 Mbps | 41 | EtherChannel |
| 50 Mbps | 35 | EtherChannel |
| 54 Mbps | 33 | 802.11 wireless |
| 60 Mbps | 30 | EtherChannel |
| 70 Mbps | 26 | EtherChannel |
| 80 Mbps | 23 | EtherChannel |
| 100 Mbps | 19 | Fast Ethernet |
| 200 Mbps | 12 | Fast EtherChannel |
| 300 Mbps | 9 | Fast EtherChannel |
| 400 Mbps | 8 | Fast EtherChannel |
| 500 Mbps | 7 | Fast EtherChannel |
| 600 Mbps | 6 | Fast EtherChannel |
| 700 Mbps | 5 | Fast EtherChannel |
| 800 Mbps | 5 | Fast EtherChannel |
| 1 Gbps | 4 | Gigabit Ethernet |
| 2 Gbps | 3 | Gigabit EtherChannel |
| 10 Gbps | 2 | 10G Ethernet |
| 20 Gbps | 1 | 20G EtherChannel |
| 40 Gbps | 1 | 40G EtherChannel |
