By default, EIGRP uses only bandwidth and Delay when calculating the metric. EIGRP uses these scaled values to determine the total metric to the network:

The default values for K are:

For default behavior, you can simplify the formula as: Metric = Bandwidth + Delay

Reference:
http://www.cisco.com/warp/public/103/eigrp-toc.html#eigrpmetrics

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