From: Blaine Williams (williams.blaine@gmail.com)
Date: Sun Jun 17 2007 - 10:50:10 ART
Erich,
When the last hop router switches over to the SPT, it will root the
(S,G) entry at the multicast source instead of the RP. That requires
an RPF check on the source instead of the RP.
Blaine Williams
On 6/17/07, Erich Herzog <erichherzog@gmail.com> wrote:
> When the RP switches to SPT, does the the source/dest do another RPF Check?
> I noticed, when the SPT switched, it took a different path than the path to
> m RP (specified with ip mroute). Before I set NBMA mode, it worked fine.
> After I slapped on NMBA mode, the pings failed after the SPT switchover, but
> responded a couple times before the switchover. I had to add additional
> mroutes to include the multicast source, and force it to travel on the same
> RP path to get it to work.
>
> Anyone care to explain? Thanks,
>
> Erich
>
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