From: tycampbell@comcast.net
Date: Wed Jun 16 2004 - 17:28:48 GMT-3
Thanks John...sometimes the frustration of the day gets to me..as I sure it does to all of us, when you have to follow behind and clean some messes up...if you know what I mean.....arrggh...hahahah...but I still love my job...just a bad day...glad it doesn't happen very often...if you know what I mean...and I apologize...
I did find the article helpful, but I am still having an issue fully understanding the concept...it looks very simple...and I am most likely not thinking on those terms
ok...
here's what I am having a hard time grasping..
going on the example of the article....
router with metric of 20
router with metric of 30
variance is set to 40.... 2*20 = 40 ok...I'm good so far...
then the variance is 2....shouldn't it be 3, as 2*20 = 60, which is also divisible by 30 ?
now that the metric of the 20 is set to 40...wouldn't the one with the metric of 30 be preferred...I guess I am looking at this from a perspective of the metrics need to match for each route in order to be balance properly...I though asking for a formula may help me understand this better, but I still don't see the metrics being the same for each route...that is what is confusing me...any insight into this would be greatly appreciated...
> Hello Ty,
> I apologize if I offended you. I wasnt saying that you didnt do any
> research, I was just making a general observation.
> Again, my sincere apologies, this is a great forum, with very good
> engineers, we can all try and make this a better place. I hope you find the
> article I provided you as well to be helpful.
> Sincerely,
> Matijevic
> ----- Original Message -----
> From: <tycampbell@comcast.net>
> To: "John Matijevic" <matijevi@bellsouth.net>
> Cc: "Marvin Greenlee" <marvingreenlee@yahoo.com>; <ccielab@groupstudy.com>
> Sent: Wednesday, June 16, 2004 8:37 AM
> Subject: Re: eigrp variance
>
>
> > 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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> > > >
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