From: Toh Soon, Lim (tohsoon28@gmail.com)
Date: Wed Aug 22 2007 - 18:28:51 ART
Hi All,
Please see below URL.
Using IP Multicast Over Frame Relay Networks
http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00800d6b61.shtml
I'm currently labbing a scenario (Auto-RP in NBMA environment) that exactly
matches Figure 5. My C-RP/MA (on the same router) is connected back-to-back
to one of the FR spoke routers. The routers' physical interfaces are
configured for sparse-dense-mode. Issue is, only the hub router received the
group-to-RP mapping info. The other spoke routers did not receive.
I have tried configuring "ip pim nbma-mode" on the routers' FR interfaces
but still not working.
Is there really a workaround to this scenario? To quote the technote:
The NBMA mode feature does not support PIM dense mode. Auto-RP, a method for
disseminating rendezvous point (RP) information in an IP multicast network,
relies on dense mode flooding of data from two well-known multicast group
addresses, 224.0.1.39 and 224.0.1.40. These groups are candidate RP and RP
mapping information groups. Without dense mode flooding capability,
multicast routers in a Frame Relay network using Auto-RP may have problems
receiving RP mapping information unless the Mapping Agent (MA) is placed in
the appropriate location within the network or a more costly full mesh
architecture is created.
I have gone thru some past archives on this issue but I'm still baffled by
the concept. Appreciate any help.
Thank you.
B.Rgds,
Lim TS
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