From: Ivan (ivan@iip.net)
Date: Mon Mar 12 2007 - 05:38:59 ART
To reach R2 from R4 in H&S topology mpacket must go through R5. But if you see
unicast FIB you see that next hop to F0/0 R2 is S0/0 R2.
To correct this you can: ip mroute "receiver" "receiver mask" "R5 S0/0.245"
On Monday 12 March 2007 04:54, Ryan 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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-- Ivan
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