From: Ivan (ivan@iip.net)
Date: Wed Feb 14 2007 - 09:04:34 ART
RPF check perform to avoid routing loop. RPF perform always.
If interface hasn't ip pim xxx-mode this interface doesn't participate in pim
routing process.
On Wednesday 14 February 2007 06:48, Navin MS wrote:
> Hello Folks,
>
> After staying low for sometime, I just picked up working for the Lab again.
> While doing one of the IE Tech Lab exercises, I got confused on the
> Multicast RPF Failure Scenario. Can some plz help
>
> 3 routers R1, R5 and R6 connected via FastEth
> Source----R1--------R5-------R6----Client
>
> Except for the interface on R5 connecting to R1, ALL others are PIM
> dense-mode enabled. This brings me to 2 important Qs.
>
> (1) This may be silly, but is RPF check necessary for Dense-mode flooding
> too ? (2) Since R1 floods the multicast feed regardless of whether R5 is
> interested or not, R5 is going to receive the feed. Now, will the traffic
> be dropped at R5 or will R5 do an RPF check and flood again ?
>
> In short, if the incoming multicast interface is not PIM dense-mode enabled
> .. but if it still receives multicast feed, will further flooding happen
> (assuming RPF check succeeds) ?
>
> I don't have racktime to test it on .. Appreciate if anybody can help.
> Thanks,
> Naveen.
>
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-- Ivan
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