From: Howard C. Berkowitz (hcb@gettcomm.com)
Date: Mon Mar 15 2004 - 17:55:45 GMT-3
At 10:19 AM -1000 3/15/04, Xy Hien Le wrote:
>RE: IE sample lab..Thank you Richard and Joseph, I will just do as lab
>required...
>
>Cheers
>
>Xy
> ----- Original Message -----
> From: Richard Dumoulin
> To: Xy Hien Le ; ccielab@groupstudy.com
> Sent: Monday, March 15, 2004 9:34 AM
> Subject: RE: IE sample lab..
>
>
> Danny would say "u r looking too much in the question". In
>InternetworkExpert, if it says "only redistribute on R5" then just do that.But
>you could do redistribution as well on R3 if you wish. The main point is to
>learn and understand what Brian wanted us to understand. In DoitLabs, that is
>another story, but it is up to you as long as you are not violating the
>prerequisites.
>
> On the real lab ? I don't know. Can anyone comment ?
Let me speak to this both from a real-world and a practice lab design
standpoint. First, in real networks, I have very, very infrequently
found a need to have any level of IGP mutual redistribution. It's
usually far better to redistribute hierarchically, making one routing
domain a core, or, in fact, setting up a backbone-of-backbones
(usually BGP). BGP has better routing policy controls than anything
else.
I don't think I've ever done full mutual redistribution between
real-world IGPs. I have had situations where the research lab of a
large corporation, which had its own Internet access long before
Corporate did, advertise most of its internal routes to Corporate,
and take summary routes to other divisions, but not default, from
Corporate. The labs also didn't advertise research and test networks
to Corporate. They did advertise some networks, both server and
collaborative research, to the Internet.
I avoid multiple points of redistribution except when there is a
specific high-availability need for it. In those cases, I almost
always use IGP1 to BGP and BGP to IGP2, so I can use things like
conditional route injection.
From the standpoint of practice labs, I make a point of telling the
learner where to redistribute. Let's put it this way -- if I to do it
on R3 but didn't mention R5, don't DREAM of deciding on extra places
until you have read the ENTIRE scenario. It's entirely possible that
later steps in the scenario will do something with which extra
redistribution would interfere. If step 3 says redistribute between
EIGRP and OSPF on R6, and you think you could also redistribute on
R2, don't blame me if a later step calls for adding and
redistributing between RIP and ISIS on R2. Your earlier
redistribution on R2 completely messes up the solution based on what
I expect R2 to know, based on the AD's, for example, of what should
be visible on that router.
>
> --Richard
>
> -----Mensaje original-----
> De: Xy Hien Le [mailto:byme88@hotmail.com]
> Enviado el: lunes, 15 de marzo de 2004 20:03
> Para: ccielab@groupstudy.com
> Asunto: IE sample lab..
>
>
>
> Hello group,
>
> I have some questions regarding the Internetwork Expert Sample lab, hoping
>the
> authors of this magnificent Lab, or some of you Experts would help me to
> clarify.
>
> The IE sample lab has OSPF & EIGRP 100 mutually redistribute on R5 as task
> 5.24 to 5.27 instructed....
>
> I am debating of whether I should mutually redistributing OSPF & EIGRP 100
>on
> R3 also???... since the task have left it unsaid. It only explicitly asking
>to
> redistribute only on R5.... between OSPF& EIGRP 100...
>
> Perhaps this is deliberately left out by the authors of the lab... and my
> question is, in real lab exam, if facing same situation, should I just go
> ahead and redistribute between OSPF & EIGRP 100 on R3, to obtain the
> redundancy in case R5 loose its connection to SW2 ?.... or should I just do
>as
> tasks instructed.... in case the Proctor would not comment....?
>
> Thank you all in advance.
>
> Cheers,
>
> Xy
>
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