From: Adhu Ajit (adhu_ajit@yahoo.com)
Date: Thu Nov 02 2006 - 01:14:59 ART
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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