From: Ivan (ivan@iip.net)
Date: Thu Nov 02 2006 - 06:03:50 ART
You can do the trick in this topology.
Run Auto-RP groups in sparse mode and manually set RP for this. (also need to
use ip nbma mode on hub router). Therefore information about RP correctly
extend through multicast domain.
Note such topology will work only in sparse mode.
IMO dense mode don't run correctly int H&S topology.
On Thursday 02 November 2006 07:14, Adhu Ajit wrote:
> Folks, I have a NBMA topology with Rtr A has the hub and Rtr B, C and D as
> the spokes. Nothing fancy here. Rtr A is configured with NO sub-interfaces
> and so are the other routers.
>
> In a real-world scenario I would not do the following. (A disclaimer to
> prevent a bunch of people pouncing on me that it does not make practical
> sense. :-)) However, in my lab network, I made Rtr B (one of the spokes) as
> the RP as well as the mapping agent.
>
> Now, when I do show ip pim rp mappings on B and Rtr A, the display is
> good. However, the spokes, C and D do not get the mapping information.
>
> When I do a show ip mroute on the Auto-RP mapping agent address,
> 224.0.1.40 on Rtr A, since the incoming interface is the serial interface
> the OIF does not contain the same serial interface. Makes sense to me.
> Remember that I'm NOT using sub-interfaces for each of the spokes. All of
> them are on the subnet and terminate on the same serial interface on the
> hub.
>
> Now, my comment is this. This scenario can never work. The solution is to
> change the mapping agent to be the hub router, Rtr A, or create
> sub-interfaces for each of the spoke if I still wish to keep Rtr B as the
> mapping agent/RP.
>
> Anyone care to comment ?
>
> Thanks,
> Adhu.
>
>
>
>
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-- Ivan
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