From: Ryan (ryan95842@gmail.com)
Date: Sun Mar 11 2007 - 22:54:06 ART
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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