In EIGRP, what factors contribute to the composite metric?

In EIGRP (Enhanced Interior Gateway Routing Protocol), the composite metric is a critical component that determines the most efficient route for data packets. This metric is based on multiple factors, specifically bandwidth, delay, load, reliability, and MTU (Maximum Transmission Unit).

Bandwidth refers to the maximum capacity of a link, which directly affects the speed of data transmission. Delay indicates the time it takes for a packet to traverse the network, and it includes factors such as queue time, propagation time, and processing time. Load represents the amount of traffic currently being carried by a link, which can impact its performance. Reliability is a measure of the potential consistency of a link, based on error rates and previous performance. MTU, while less commonly discussed in the context of the metric, can impact the efficiency of data transmission and therefore is included as a factor.

Using this combination of metrics allows EIGRP to calculate a more nuanced and accurate representation of the network conditions, leading to better routing decisions. Each of these factors contributes uniquely to the overall composite metric, enabling EIGRP to optimize paths based on the current state of the network.