From: Mathew Fernando (mathewfer@gmail.com)
Date: Tue May 16 2006 - 11:17:47 ART
Hi Group,
I setup a LAB scenario with a hub-and-spoke topology where there are 3 spoke
routers and 2 of the spokes has another router behind.
The hub router uses FR sub-interfaces for 3 spoke routers.
RIP is configured on all the interfaces on all the routers and PIM SPARSE
mode is configured on all the interfaces.
AUTO-RP is configured on the HUB router who acts as the RP as well as the
mapping agent. No filters are applied for the groups in RP or mapping agent
configs.
When I say "show ip pim rp mapping", it shows the RP IP (of the hub router)
on all the spoke routers except on the 2 routers behind the spoke routers.
MY QUESTION IS: I do not understand how these 3 spoke routers learn the
AUTO-RP when there is no DENSE mode (or sparse-dense) configured.
Also the command "ip pim autorp listener" is not configured on any of the
routers. I understand why these 2 routers behind the spoke does not see the
AUTO-RP (because there is no DENSE configured). IOS on all the routers are
12.2T.
Can someone please explain how this works?
Thanks in advance
mathew
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