Metric Tuning
Engineers have a couple of commands available that allow them to tune the values of the OSPF interface cost, thereby influencing the choice of best OSPF route. This section discusses the three methods: changing the reference bandwidth, setting the interface bandwidth, and setting the OSPF cost directly.
Changing the Reference Bandwidth
OSPF calculates the default OSPF cost for an interface based on the following formula:
Cost = Reference-Bandwidth / Interface-Bandwidth
The reference-bandwidth, which you can set using the auto-cost reference-bandwidth bandwidth router subcommand, sets the numerator of the formula for that one router, with a unit of Mbps. This setting can be different on different routers, but Cisco recommends using ...
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