From: Pavel Bykov (slidersv@gmail.com)
Date: Tue Mar 03 2009 - 12:30:21 ARST
The solution is to use sparse mode in combination with "ip pim nbma-mode" on
the hub.
This will overcome the issue of sending the multicast out of the interface
on which it was received.
On Tue, Mar 3, 2009 at 3:23 PM, Mukom TAMON <mukom.tamon@gmail.com> wrote:
> Dear all,
> I have been completely beaten by a scenario. Given 3 routers,
> Spoke1===========Hub=============Spoke2
>
> Each of s0/0 is connected to the frame relay cloud, ospf routes everything
> in area 0.
> I correctly mapped all L2-L3 mappings on all routers.
> My problem is this .... Is it possible to have a multicast source on any of
> the spokes with a receiver on the other?
> I have tried configuring this but can't get a spoke source to actually
> function.
>
> My investigation (show ip mroute and debug ip mpacket) on the hub shows
> that
> Outgoing Interface List [OIL] is empty for a source on the spoke ... which
> makes sense to me; without any physical spoke-to-spoke connection, a
> multicast packet comes into Hub via s0/0 and I don't think multicast will
> allow it go back out s0/0
>
> Apart from using say point-to-point interfaces, is there a way to make
> multicast work in the above scenario? btw, I believe I configured multicast
> properly ... if I do a multicast ping from Hub, receivers on either spoke
> respond. Any insights? suggestions [Lab 9 in CCIE Practical Studies vol II
> also has something like this]. I appreciate any help
>
>
> M.A. TAMON
> B.Eng, CCNP, CCNA
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