From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Tue Oct 30 2007 - 14:08:27 ART
and it will be the next hop from R5's perspective leading back to the
source.
On 10/30/07, Joseph Saad <joseph.samir.saad@gmail.com> wrote:
>
> It gets there by looking up how to route back to "S". In essence, this is
> the RPF check that you have just overriden.
>
> It doesn't mean that you changed the RPF interface, by doing a static ip
> mroute. You just allowed the traffic to be accepted on an interface other
> than the one connected to the RPF neighbor.
>
> Remember the RPF interface is determined by the IGP.
>
> Joseph.
>
> On 10/30/07, John <jgarrison1@austin.rr.com > wrote:
> >
> > I have the following scenario.
> > S---R3----R1----R2---R4
> > | |
> > R5-------------
> > |
> > R6-----H
> > R4 connects to R5(my diagram isn't the best). I'm asked to enable PIM
> > in
> > dense mode on all transit interfaces, except on the link between R1 and
> > R5.
> > This causes a RPF failure in the link between R4 and R5. I use a static
> > mroute on R5 to override the RPF check. On R5 I get this for sh Mroute
> > 224.1.1.1 before the mroute is installed
> > (*, 224.1.1.1), 00:02:00/stopped, RP 0.0.0.0, flags: D
> > Incoming interface: Null, RPF nbr 0.0.0.0
> > Outgoing interface list:
> > FastEthernet0/1, Forward/Dense, 00:02:00/00:00:00
> > Serial2/0.1, Forward/Dense, 00:02:00/00:00:00
> >
> > (10.1.37.7, 224.1.1.1), 00:02:00/00:00:59, flags:
> > Incoming interface: Null, RPF nbr 150.1.15.1
> > Outgoing interface list:
> > Serial2/0.1, Forward/Dense, 00:02:00/00:00:00
> > FastEthernet0/1, Forward/Dense, 00:02:00/00:00:00
> >
> > Why do I show my RPF neighbor for the (S,G) being 150.1.15.1 (R1's
> > address).
> > How did it get there. Once the group is advertised doesn't it flow
> > downstream. That should mean that R5's incoming interface for the
> > 224.1.1.1
> > entry should be connected to R4. Why is it picking up R1's address
> > which does
> > not have PIM enabled on it and neither does the interface which connects
> > to R1
> > from R5? I'm getting ready to read the RFC for PIM in dense mode, but
> > if
> > anyone can shine a light on this feel free.
> >
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