From: Ivan (ivan@iip.net)
Date: Thu Oct 26 2006 - 06:10:05 ART
In addition to WorkerBee. NBMA-mode in H&S-topology prevent to issue same
Input/Output interface.
Ordinary behaviour is multicast packet don't send back to interface from wich
it received. NBMA-mode help to resolve this issue.
On Thursday 26 October 2006 07:49, WorkerBee wrote:
> ip pim NBMA mode is used when you have a hub-spoke FR topology running
> in sparse mode only.
>
> This ip pim nbma mode ensure the hub pim router will treat each spoke as an
> individual multicast subscriber, hence when any spoke send a prune message
> to the hub, the hub will only prune that particular spoke but the rest of
> the spokes that are still subscribing to the multicast feeds remain
> unaffected.
>
> Do a show ip mroute, you can see the multicast OLIST contains both
> the (1) outgoing interface and the (2) spoke ip address.
>
> The main thing is item (2) which is critical for ip pim nbma mode to
> function properly.
>
> On 10/26/06, Bobby <aggiebob98@yahoo.com> wrote:
> > Folks:
> >
> > With multicast, I am having some trouble understanding why ip pim
> > nbma-mode is used at times? I understand that it is used on WAN
> > interfaces (frame, etc), but I see times in InternetworkExperts where
> > they don't use it and others they do. Can anyone shed some light on
> > this? Thanks!
> >
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-- Ivan
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