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Re: Help on Multicast posted 09/19/2006
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Do this in sparse and dense mode and see if there is a difference.  Without
having IP NBMA on your frame hub, look at the mroute table and look at the
incoming/outging interfaces.  You should see the actual interface port/slot
numbers are the same.  If multicast traffic comes in from a spoke to the
hub, bound for the other spoke, the multicast traffic will be dropped
because multicast traffic cannot go out the same interface it came in
(equivalent to IP split-horizon).  Now do the same thing with IP NBMA on the
hub interface.  You will see the outgoing interfaces specify not only the
port/slot, but the IP address.  This allows the multicast traffic to come in
and go out the same physical interface.  Check it out.

-Broadway


On 9/19/06, Michael Zuo <mzuo@xxxxxxxxxxx> wrote:
>
> Does anyone know exactly under what conditions "ip pim nbma" is needed
> on the Frame-relay hub router?
>
> Does this only apply to sparse-mode and router having a
> point-to-multipoint sub-interface?
>
> thanks
>
> -----Original Message-----
> From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
> nisha rani
> Sent: Tuesday, September 12, 2006 1:01 PM
> To: Hash Aminu
> Cc: Brent Foster; Angelo De Guzman; Cisco certification
> Subject: Re: Help on Multicast
>
> Hi all,
>
> Thanks to all of you with your prompt reply. I was missing "ip pim nbma"
> command on the hub router and it is working.
> Kind regards,
>
>
>
> On 12/09/06, Hash Aminu <hashng@xxxxxxxxx> wrote:
> >
> > Hello,
> >
> > I just Simulate your Scenario and i was able to ping the Group, though
> i
> > have PIM nbma-mode configured on the frame relay interfaces.
> >
> > try that out.
> > making the Hub the mapping agent and the lo0 interface pim sparse mode
> > will
> > be ok. if any issues paste your configs please .
> >
> > Thank you
> > Hashiru Aminu
> >
> >
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