# OSPF

## <span class="mw-headline" id="OSPF_Cost">OSPF Cost</span>

```
cost = reference bandwidth / configured bandwidth of interface in kbps

reference bandwidth = 100,000 kbps
```

<table border="1" id="bkmrk-interface-speed-ospf"><tbody><tr><td>Interface speed</td><td>OSPF Cost</td></tr><tr><td>100 Mbps</td><td>1</td></tr><tr><td>10 Mbps</td><td>10</td></tr><tr><td>6 Mbps</td><td>17</td></tr><tr><td>5 Mbps</td><td>20</td></tr><tr><td>4 Mbps</td><td>25</td></tr><tr><td>3 Mbps</td><td>33</td></tr><tr><td>2 Mbps</td><td>50</td></tr><tr><td>1.5 Mbps</td><td>67</td></tr><tr><td>1 Mbps</td><td>100</td></tr><tr><td>768 Kbps</td><td>130</td></tr><tr><td>512 Kbps</td><td>195</td></tr><tr><td>384 Kbps</td><td>260</td></tr><tr><td>256 Kbps</td><td>391</td></tr><tr><td>128 Kbps</td><td>781</td></tr><tr><td>64 Kbps</td><td>1563</td></tr></tbody></table>