From: NET HE (he_net@hotmail.com)
Date: Wed Aug 22 2007 - 20:42:50 ART
I have tried this before.
My understanding is that for dense-mode, there is a split-horizon issue.
Therefore, even though hub has received mapping information, hub will not
forward it to other hubs.
For sparse-mode, command IP PIM NBMA-mode is to overcome split-horizon
issue.
To work around it, think about how to overcome split-horizon. So multiple
point-to-point subinterfaces will work.
Best Regards,
Net (Xin) He
>From: "Toh Soon, Lim" <tohsoon28@gmail.com>
>Reply-To: "Toh Soon, Lim" <tohsoon28@gmail.com>
>To: "Cisco certification" <ccielab@groupstudy.com>
>Subject: Auto-RP Issues with NBMA Mode
>Date: Thu, 23 Aug 2007 05:28:51 +0800
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>
>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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