From: David Cho (David.Cho@interealty.com)
Date: Wed May 28 2003 - 22:05:45 GMT-3
I saw this from Solie's book.
Basically, the formula is same but "X" value(see below) can be calculated
only if k1=1. If k1 <>1, X is 1. In other words, k5 value doesn't make any
difference when k1 is 1. David
X= [k5/(reliability + k4)] <<<<<<<<<<<<<<
metric = [k1 * bandwidth + (k2 * bandwidth)/(256 - load) + k3 * delay]
If k5 does not equal zero, an additional operation is performed:
metric = metric * [k5/(reliability + k4)] = metric * X
-----Original Message-----
From: Brian McGahan [mailto:brian@cyscoexpert.com]
Sent: Wednesday, May 28, 2003 5:32 PM
To: Danny.Andaluz@triaton-na.com; ccielab@groupstudy.com
Subject: RE: EIGRP metric (just to be sure)
Danny,
Bandwidth, load, delay, and reliability make up the composite
metric. By default, only bandwidth and delay are taken into account.
In order to consider load or reliability, you must weight those
corresponding K values with the 'metric weights' command under the EIGRP
process.
The calculation is as follows:
metric = [k1 * bandwidth + (k2 * bandwidth)/(256 - load) + k3 * delay]
If k5 does not equal zero, an additional operation is performed:
metric = metric * [k5/(reliability + k4)]
For more detail see:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/
fiprrp_r/1rfeigrp.htm#1023638
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Toll Free: 866.CyscoXP
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Danny.Andaluz@triaton-na.com
> Sent: Wednesday, May 28, 2003 1:41 PM
> To: ccielab@groupstudy.com
> Subject: EIGRP metric (just to be sure)
>
> Hello, Group. Is the below correct with regards to how eigrp picks a
best
> route? Does it do it like the below or does each value get taken into
> account for the composite metric?
>
> BW
> Delay (in case of tie with BW) ?
> relia (in case of tie with delay) ?
> load (in case of tie with relia) ?
> MTU (in case of tie with load) ?
>
> Thanks,
> Danny
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