EIGRP Metric

Dual selects routes based on 5 composite metrics, but by default it only uses 2 (Bandwidth and Delay).

To choose the desired destination to R 5 dual will choose the path with lowest Metric.

Bandwidth + Delay= lowest Metric

Bandwidth = (10^7/least Bw)*256

Delay= (total delay)*256

 The formula is (10^7/least Bw)*256 + Total Delay*256

R1-->R2 -->R5

Least Bandwidth to R5 = 64 KBPS

Total Delay = 4000*256

Bandwidth = (10^7/least Bw)*256 = (10,000,000/64)*256= 40,000,000

Delay= (2000+2000)*256=1024000

Eigrp Metric calculation =40,000,000 + 1024000= 41024000

R1-->R3-->R4>R5

Least Bandwidth to R5 = 64 KBPS

Total Delay = 6000*256

Bandwidth = (10^7/least Bw)*256 = (10,000,000/64)*256= 40,000,000

Delay= (2000+2000+2000)*256= 1536000

Eigrp Metric calculation = 40,000,000 + 1536000= 41536000

Router R1 therefore choose the lower path with the Metric of 41024000