Metrics in OSPF are based on cost. This value represents the line speed of the medium the router is attached. For example, if the ethernet port of a router running at 10Mbs is configured for OSPF, the cost might be a value of 10. Normally, the slower the connection speed the higher the cost. Each manufacturer provides a cost for the speed parameters for each type of connection. You can override the default values and change the cost to anything you want.
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