From: tycampbell@comcast.net
Date: Wed Jun 16 2004 - 12:37:03 GMT-3
John,
I wasn't trying to be lazy or anything, I do searches for everything before posting a question, when I don't fully understand something from the documentation. I did research, before I posted the question. We all learn from asking questions. If the purpose of the forum is to not ask questions and learn about something we don't understand, then I will refrain from doing so. However, as I stated before, I am fully aware of doing a search, which I have already done. That is why the question was posted. My very first search was actually done on the DOC CD under eigrp. I did not fiind anything on the DOC CD that under eigrp that even stated anything about variance. It wasn't my last search however. By your response, you are stating that I did not do that, without even asking me first. Once again, the only reason I posted the question was to try to get more understanding about it. I didn't post the question looking for an easy way out. aA few people responded...it gave me bet!
ter insight to this, and I understand it better now, and I appreciate their response.
Ty
> 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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