From: Darby Weaver (darbyweaver@yahoo.com)
Date: Mon Mar 12 2007 - 02:26:03 ART
I do not recall anyone ever even mentioning anything
about about full multicast reachability in any
practice lab but in the real lab one might wish to
verify the objectives with the proctor.
Since many people seem to score poorly on multicasting
and not know why you might be on to something.
--- Ryan <ryan95842@gmail.com> wrote:
> I was doing a lab this morning (IEW Lab3 ver 4 if
> you must know...) and came
> across a problem with the lab. Basically classic RPF
> issue with multipoint
> NBMA interface.
>
> Scenario (use fixed width font for best viewing)
>
> R5 (s0/0.245) --502-------205--(S0/0) R2
> (F0/0)-----|
> \
> 504
> \
> 405
> \
> (S0/0)
> R4
>
> R5 is the RP and mapping agent. Using sparse-dense
> mode. So, the objectives
> didn't say anything about a where the Multicast
> source would/could be. Rest
> of the objectives where just some IGMP stuff. I went
> to test and created a
> "source" on R4 and a client on R2. Problem developed
> of course since R5 is a
> multipoint NBMA interface and we are running sparse
> dense mode. I verified
> my configuration with the solution guide and it was
> the same and correct.
> The testing in the solution guide had R5 as the
> source which of course
> works, but I had initially tested from R4 which of
> course did not.
>
> This brings up my questions, do we need to have full
> Multicast Reachability
> in the lab?
>
> The objectives did not require it and the solution
> guide sure didn't have
> it, but what about the real lab? Should I go to the
> extra steps to insure
> that I have full multicast reachability from any
> possible source to any
> destination regardless of the objectives given?
>
>
> -Ryan
>
>
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