From: Joseph Saad (joseph.samir.saad@gmail.com)
Date: Tue Oct 30 2007 - 14:06:29 ART
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.
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Fri Nov 16 2007 - 13:11:19 ART