No, no need to go back to school. Cisco takes liberties with the rules of
algebra for purposes of the EIGRP/IGRP metric calculation. If K5=0, the
last term is ignored. This is covered in BSCN, and in the book, "EIGRP
for IP" by Retana, Slice & White.
Pamela
On Mon, 15 Jan 2001, [iso-8859-1] Phil Barker wrote:
> Thanks for that link Glen,
>
> It looks now like its me against the world.
>
> In the UK I would call K5 the nominator of this part
> of the equation and "reliability + k4" would be the
> denominator.
>
> If the nominator = 0 then the expression k5/(rel + k4)
> will be 0. As a result when multiplying by anything on
> the left will result in 0.
>
> I'm wondering if there is a difference in algebraic
> notation batween USA and UK or if I need to go back to
> school ?
>
> Regards,
>
> Phil.
>
> --- Glenn Johnson <[EMAIL PROTECTED]> wrote: >
> http://www.cisco.com/warp/public/103/eigrp1.html
> >
> > -----Original Message-----
> > From: [EMAIL PROTECTED]
> > [mailto:[EMAIL PROTECTED]]On Behalf Of
> > Phil Barker
> > Sent: Monday, January 15, 2001 11:59 AM
> > To: cisco GroupStudy
> > Subject: CertificationZone White Paper EIGRP ?
> >
> >
> >
> > I'm having trouble with the equation referenced on
> > page 5 (A4) concerning the metric calculation.
> > Ref Don Dettmore.
> >
> > If this equation is correct as it stands and
> > K2=K4=K5=0
> > Then the Right Side of the equation will be 0, which
> > when multiplied by whatever on the left side will
> > equal 0. i.e metric = 0. I'm guessing a little that
> > these two sides should be added together not
> > multiplied ? Can anyone verify this ?
> >
> > I've cross checked this with Ivan Pepelnjak' book on
> > EIGRP. Chapter 1, Page 10 "Computing a Composite
> > Metric" appears to verify that the White Paper is
> > CORRECT. They both suggest that if K5 = 0 then the
> > Composite Metric = 0 ???
> >
> > Ivan also suggests that if all K-Values are set to
> > zero then the composite metric is always 1 ?
> >
> > Wether or not you add or multiply both sides
> > together
> > the composite metric will = 0.
> >
> > Anyway, there is also a typo below 108 should read
> > 10^8
> >
> >
> >
> > >>SNIP
> > This differs from the bandwidth usage in OSPF, in
> > which route cost, by default, derives from the sum
> > of
> > interface costs along the path. OSPF interface cost
> > defaults to 108/interfaceBandwidth, where
> > interfaceBandwidth is 1544 or the value of the
> > interface bandwidth commands (with a value in
> > kilobits).
> >
> >
> > >>END SNIP
> >
> >
> > Any thoughts ?
> >
> > Phil.
> >
> >
> >
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