An EIGRP router receives advertisements from each neighbor listing the advertised distance (AD) and feasible distance (FD) to a route. The AD is the metric from the neighbor to the network. FD is the metric from this router, through the neighbor, to the destination network.
EIGRP Metric:
The EIGRP metric is shown in given figure
The k values are constants. Their default values are K1=1, K2=0, K3=1, K4=0, K5=0, the final part of the equation (k5/[rel+k4]) is ignored.
BWmin is the minimum bandwidth along the path--the choke point bandwidth.
Delay values are associated with each interface. The sum of the delays (in tens of microseconds) is used in the equation.
Taking the default k values into account, the equation simplifies to the one shown in figure.
If default k values are used, this works out to be 256(BW + cumulative delay).
Bandwidth is the largest contributor to the metric. The dalay value enables us to choose a more direct width is equivalent.
