Tuning the EIGRP Metric Calculation
By default, EIGRP calculates an integer metric based on interface bandwidth and delay. You can change the settings on any interface using the bandwidth value and the delay value interface subcommands, which in turn influences a router’s choice of routes.
Cisco recommends setting each interface’s bandwidth to an accurate value, rather than setting the bandwidth to some inaccurate value for the purpose of changing EIGRP’s metric calculation. Router serial links should be configured with the bandwidth speed command, with a speed value in kilobits per second (Kbps), matching the interface’s actual speed. Router Ethernet interfaces can use default settings; by default, IOS actually changes the router Ethernet interface ...
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