RE: EIGRP K values

Also I just thought I would share. We are starting to create our blog posts
into a technical library that can be used as a free resource. Here is the
list of current topics available.
http://www.ipexpert.com/Cisco/CCIE/Library

Right now it is just broken down by CCIE. We will be updating it soon to be
broken apart by blueprint topic etc. I hope this is helpful to everyone.

Regards,
 
Tyson Scott - CCIE #13513 R&S, Security, and SP
Managing Partner / Sr. Instructor - IPexpert, Inc.
Mailto: tscott_at_ipexpert.com

-----Original Message-----
From: nobody_at_groupstudy.com [mailto:nobody_at_groupstudy.com] On Behalf Of
Narbik Kocharians
Sent: Thursday, October 07, 2010 9:27 AM
To: Piotr Malarski
Cc: Cisco certification
Subject: Re: EIGRP K values

Hahahaha

Both links are from Cisco. Amazing, i did not pay attention to that.

But Both formulas will result to the same composite metric unless the K5
value is manipulated. Now that i look at both of them a little more
carefully, i would go with your link. I think they have a typo in the link
that i provided.

On Thu, Oct 7, 2010 at 6:12 AM, Piotr Malarski
<piotr.malarski.99_at_gmail.com>wrote:

> The formula from the link that you provided is not the same as the
> formula from the DOC CD available during lab.
>
> #1 : Formula from your link:
> metric = [K1 * bandwidth + (K2 * bandwidth) / (256 - load) + K3 *
> delay] * [K5 / (reliability + K4)]
>
> #2 : Formula from DOC CD, IOS 12.4 Configuration guide
> metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) + (K3*Delay)*(K5/(Reliability +
> K4)))
>
> The differences are:
> a. Compare how K values are grouped with brackets in both formulas. If
> K5=1 then calculation is different in formula #1 and #2
> b. In #2 there is multiplication by 256, not in #1
>
> One of them (or both) must be wrong. Which one ?
>
> I am referring to this DOC CD article:
>
>
http://www.cisco.com/en/US/docs/ios/iproute_eigrp/configuration/guide/ire_cf
g_eigrp_ps6350_TSD_Products_Configuration_Guide_Chapter.html
>
>
> On Thu, Oct 7, 2010 at 4:44 AM, Narbik Kocharians <narbikk_at_gmail.com>
> wrote:
> > If K5 is set to it's default value (Which is zero), the last portion of
> the
> > formula (K5/K4+rel) will not come into play:
> >
> >
>
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094c
b7.shtml
> >
> >
> >
> > On Thu, Oct 7, 2010 at 1:09 AM, Elias Chari <elias.chari_at_gmail.com>
> wrote:
> >
> >> Yes, the maths do not work out when you look at it that way. May be
> >> another
> >> way to represent the formula, which may make it easier to interpret
> would
> >> be:
> >>
> >> (a) For K5>0, the formula applied by the router is:
> >>
> >> EIGRP Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) +
> >> (K3*Delay)*(K5/(Reliability + K4)))
> >>
> >> (b) For K5=0, the formula applied by the router is:
> >>
> >> EIGRP Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) + (K3*Delay))
> >>
> >>
> >> On 7 October 2010 07:53, Narbik Kocharians <narbikk_at_gmail.com> wrote:
> >>
> >> > If K5 is set to zero (Which is the default), then, the last section
of
> >> the
> >> > formula (K5/(Reliability + K4) will not come into play.
> >> >
> >> > On Wed, Oct 6, 2010 at 9:18 PM, Piotr Malarski
> >> > <piotr.malarski.99_at_gmail.com>wrote:
> >> >
> >> > > Hello,
> >> > >
> >> > > What should be K values so only delay is used to calculate the
> metric ?
> >> > > OK, I know that the answer is 0 0 1 0 0 (K1,K2,K3,K4,K5) but this
> does
> >> > > not fit the Doc CD formula:
> >> > >
> >> > > EIGRP Metric = 256*((K1*Bw) + (K2*Bw)/(256-Load) +
> >> > > (K3*Delay)*(K5/(Reliability + K4)))
> >> > >
> >> > > If K3=1 and K4=K5=0 then the last section of the above formula
> equals
> >> > > 0 and Delay will not be considered at all:
> >> > >
> >> > > (1*Delay)*(0/(Reliability + 0)) = (1*Delay)*0 = 0
> >> > >
> >> > > Actually, if K values are 00100 then the whole metric equals zero.
I
> >> > > thinks that my math is correct. Can someone please clarify ?
> >> > >
> >> > >
> >> > > Blogs and organic groups at http://www.ccie.net
> >> > >
> >> > >
> _______________________________________________________________________
> >> > > Subscription information may be found at:
> >> > > http://www.groupstudy.com/list/CCIELab.html
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> > >
> >> >
> >> >
> >> > --
> >> > Narbik Kocharians
> >> > CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> >> > www.MicronicsTraining.com <http://www.micronicstraining.com/> <
> http://www.micronicstraining.com/> <
> >> http://www.micronicstraining.com/>
> >> > Sr. Technical Instructor
> >> > YES! We take Cisco Learning Credits!
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> >> >
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> _______________________________________________________________________
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > --
> > Narbik Kocharians
> > CCSI#30832, CCIE# 12410 (R&S, SP, Security)
> > www.MicronicsTraining.com <http://www.micronicstraining.com/>
> > Sr. Technical Instructor
> > YES! We take Cisco Learning Credits!
> > Training And Remote Racks available
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
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> _______________________________________________________________________
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>

-- 
Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
YES! We take Cisco Learning Credits!
Training And Remote Racks available
Blogs and organic groups at http://www.ccie.net