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Enhanced Interior Gateway Routing Protocol (EIGRP) is a Cisco-proprietary advanced distance-vector routing protocol. The metric calculation in EIGRP is more sophisticated compared to other distance-vector protocols, incorporating multiple values to determine the best path to a destination network. EIGRP uses the following metric values to calculate its composite metric:
1. Bandwidth (Minimum Bandwidth)
– This is the lowest bandwidth value (in kilobits per second, kbps) on the path from source to destination. It’s essential because the slowest link can be a bottleneck in the network path.
2. Delay
– This represents the cumulative delay along the path, measured in tens of microseconds (10 microseconds). The delay is added up across all the routers in the path from source to destination.
3. Load
– Load is a measure of the traffic on a link, expressed as a number from 1 to 255, where 255 represents 100% utilization. However, by default, EIGRP does not use load for metric calculation to avoid rapid changes in routing tables in response to fluctuating load conditions.
4. Reliability
– This metric represents how reliable a link is, also measured as a number from 1 to 255, where 255 is 100% reliable. Like load, reliability is not used in the default metric calculation for similar reasons.
5. MTU (Maximum Transmission Unit)
– While