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Cisco CCNA Routing and Switching ICND2 200-101 Official Cert Guide by Wendell Odom

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Calculating the Best Routes for the Routing Table

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EIGRP calculates the metric for routes much differently than any other routing protocol. For instance, with OSPF, anyone with a network diagram and knowledge of the configured OSPF interface costs can calculate the exact OSPF metric (cost) for each route. EIGRP uses a math equation and a composite metric, making the exact metric value hard to predict.

The EIGRP Metric Calculation

ImageMetric Calculation

The EIGRP composite metric means that EIGRP feeds multiple inputs (called metric components) ...

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