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EIGRP metric

If the EIGRP metric is given by the following formula:

metric = [K1 * bandwidth + (K2 * bandwidth) / (256 - load) + K3 * delay] * [K5 / (reliability + K4)]

why the defaul formula is given by:

metric = bandwidth + delay

if k5 default value is zero (0) and is multipling all this factor

[K1 * bandwidth + (K2 * bandwidth) / (256 - load) + K3 * delay]

i see the default formula equals to zero, At least i am missunderstanding the formula or the k values.

Hope you can clarify me

Regards,

Aisha Sanes

3 REPLIES
Bronze

Re: EIGRP metric

If K5 = 0, the [K5/(reliability + K4)] term is not used.

This is documented in the following URL -

http://www.cisco.com/warp/customer/103/3.html

Re: EIGRP metric

Hi,

"The link characteristics from which IGRP calculates its composite metric are bandwidth, delay,load, reliability, and maximum transmission unit (MTU)."

Question:

Where is MTU used in the formula?

Regards,

Milan

Gold

Re: EIGRP metric

It's not--EIGRP and IGRP both carry the MTU in their update packets, but neither one use it in their formulas for finding the composite metric. There's some possibility you might be able to match on the MTU in route maps in the future, but there's no way to use this information at the moment.

Russ.W

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