From: John Matijevic (matijevi@bellsouth.net)
Date: Wed Jun 16 2004 - 10:15:25 GMT-3
Ty,
The answer to your question can be done by doing a simple search. Let me
explain how to do this. First you go to www.cisco.com/support, or an archive
or google, etc., Next, in the search box type variance, next you will see
seeveral articles or messages pop up, if there are too many you can try and
use a more descriptive search or try to be more specific in your search. If
there are not as many articles or messages, then you maybe too specific and
have to be general in your search. Sometimes you have to use more than one
resource, sometimes you have to experiment with different words, etc. For
the question you had I simply went to www.cisco.com/support, then I typed in
variance in the search box. Then I read the following article which
describes the function of the command. Finally, I am not trying to insult
intelegence here but merely pointing out a method that has worked for me. I
have observed many times that people do not search the archives or do proper
research before posting. Sure its easier to post the question then to do
the research yourself. But you will become a better engineer by finding the
answer yourself. At least try to make an effort. Maybe I have so much time
now that I am not working that I can support this forum, and try and make
this a better place for everyone. I hope nobody takes offense to this post,
but uses this as constructive feedback.
Here is the article:
http://www.cisco.com/en/US/tech/tk365/tk207/technologies_tech_note09186a0080
09437d.shtml
Sincerely,
Matijevic
----- Original Message -----
From: "Ty" <tycampbell@comcast.net>
To: "Marvin Greenlee" <marvingreenlee@yahoo.com>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, June 16, 2004 3:26 AM
Subject: Re: eigrp variance
> Thanks Marvin!
> ----- Original Message -----
> From: "Marvin Greenlee" <marvingreenlee@yahoo.com>
> To: "Ty" <tycampbell@comcast.net>
> Cc: <ccielab@groupstudy.com>
> Sent: Tuesday, June 15, 2004 9:58 PM
> Subject: Re: eigrp variance
>
>
> > Divide the larger metric path by the smaller metric
> > path.
> >
> >
> >
> > The variance command is related to the eigrp metric
> > calculation.
> >
> > "...If k5 equals 0, the composite IGRP or EIGRP metric
> > is computed according to the following formula:
> >
> > 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)]
> >
> > Bandwidth is inverse minimum bandwidth of the path in
> > BPS scaled by a factor of 2.56*1012. The range is from
> > a 1200-bps line to 10 terabits per second. ..."
> >
> > The variance command is a multiplier for what you
> > consider a valid path for load balancing. If your
> > metric were 3, you would be saying that the router can
> > load balance any paths with a metric that is up to 3
> > times the metric of the path with the lowest metric.
> >
> >
> > Marvin Greenlee
> > Network Learning, Inc.
> > marvin@ccbootcamp.com
> >
> >
> >
> > --- Ty <tycampbell@comcast.net> wrote:
> > > what is the formula for configuring variance for
> > > eigrp ?
> > >
> > > Thanks!
> > >
> > >
> >
> >
> >
> > __________________________________
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>
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