OSPF Metrics
Cisco uses the equation:
- 108/Bandwidth
- Bandwidth = configured bandwidth of the interface (mind the ‘bandwidth’ command).
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However, this value can be changed with the interface command “ip ospf cost {1 - 65,535}
Cisco bases the link cost on bandwidth. Other vendors may use other metrics to calculate the link cost.
When using equipment from multiple vendors, ensure the costs match, or you could end up having sub-optimal routing.