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best ccna 200 301 course.The cumulative delay value in the formula is the sum of the delay values of all the links in the route, in "ten microseconds".Using these two inputs can help EIGRP choose the best path that is more balanced than OSPF. Using the minimum bandwidth allows EIGRP to not select the route for the slowest individual link, which is often blocked. Also, the delay part of the equation adds the delay of each link together so that routes with fewer links are more likely to be selected.Users have the flexibility to set bandwidth and delay for each link using the bandwidth and delay interface subcommands. Tip:Most show commands, including showipeigrp topology and showinterface, display delay settings in microseconds. The metric formula is in ten microseconds.Example of Calculating an EIGRP MetricNow that you know how the router's EIGRP algorithm works, consider the following examples of what the router can learn from EIGRP update messages, local configuration parameters, and metric calculations for individual routes.The local router must consider the information received from neighboring routers and local interface settings. the EIGRP update lists subnet numbers and masks, cumulative latency, minimum bandwidth, and some other parts of the mixed metric that are not typically used. The router then considers the bandwidth and latency settings on the interface that received the update and calculates the new metric value.For example, Figure 9-10 shows R1 being informed of subnet 10.1.3.0/24 from R2. The update shown in the figure lists a minimum bandwidth of 100000 kbit/s and a cumulative latency of 100 microseconds (ms). r1 has an interface bandwidth set to 1544 kbit/s, which is the default bandwidth for serial links, and that interface has a latency of 20000 microseconds (ms).EIGRP Update Figure 9-10 How R1 Calculates the EIGRP Metric for 10.1.3.0/24In this example, R1 finds that its interface S0/1 bandwidth (1544 kbit/s or 1.544 Mbps) is less than the minimum bandwidth of 100000 kbps or 100 Mbps advertised in the received update,so R1 uses this new, slower bandwidth to calculate the metric value. (If R1's S0/1 interface in this example had a bandwidth of 100000 or higher, then R1 would use the minimum bandwidth listed in the EIGRP update from R2.)As for interface latency, the router always adds its interface latency to the list of latencies in the EIGRP update. However, the units of latency are somewhat difficult. The units and their use are described in detail below. Microsecond units: listed in the output of show commands (such as show interfaces and show ip eigrptopology) and in EIGRP update