Computing Enhanced Interior Gateway Protocol metric

Asked By jcato 40 points N/A Posted on - 04/01/2012

Good day!

I'm currently taking up CISCO 2 or CCNA 2 right now.

I want some networking experts to explain this to me detail to detail.

How does EIGRP compute its metric? 

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Best Answer by Lawren chavez

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Answered By jerameel25 0 points N/A #100734

Computing Enhanced Interior Gateway Protocol metric

EIGRP just uses Delay & Bandwidth with Bandwidth taking precedence.

The metric for EIGRP is calculated by multiplying the IGRP metric by 256. Try this formula used to calculate the metric.

I hope it works!

EIGRP Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) + (K3*Delay)*(K5/(Reliability + K4)))

 

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• Posted on - 05/13/2012
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Answered By Lawren chavez 0 points N/A #100735

Computing Enhanced Interior Gateway Protocol metric

Hi Jcato,

EIGRP’s metric is calculated by multiplying IGRP metric by 256. So the formula is:

Metric = 256*(((K1*Bw) + (K2*Bw)/(256-Load) + (K3*Delay)) *(K5/(Reliability + K4)))

In which:

K1 = Minimum Bandwidth (in kilobits per second)

K2 = Load (number in range 1 to 255)

K3 = Total Delay (in 10s of microseconds)

K4 = Reliability (number in range 1 to 255)

K5 = Minimum path Maximum Transmission Unit(MTU)

Usually, only Bandwidth and Delay are used in metric calculation. So K1 = 1, K3 =1 and other K-values are zero. MTU is not used in the calculation. It is tracked through the path to find the smallest MTU.

So the formula would be:

Metric = 256 *((K1 * BW) + (K3 * Delay))

I hope it helpful.

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• Posted on - 12/01/2012
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