For example, after the OSPF process is enabled on the router, the information about the interface is displayed. The output information shows that the default OSPF cost of an Ethernet interface is 7. Generally, the default OSPF cost is 1.

The default cost of an OSPF interface is calculated based on the bandwidth and bandwidth-reference. Bandwidth-reference is configured under the OSPF process. Normally, the default bandwidth-reference value is used. If the default bandwidth is 100 Mbit/s, the OSPF cost is calculated as 1.

Locate the problem of the default OSPF cost. Note the factors affecting the OSPF cost: bandwidth-reference and bandwidth. Based on these factors, locate the fault step by step.

thanks for the post

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good note

useful document, thanks