From: gladston@br.ibm.com
Date: Tue Aug 02 2005 - 13:47:54 GMT-3
Hi Thomwin,
As you check out, without nbma-mode the router sends the multicast out of the interface, with no regards if there is one or many routers on the other side.
nbma-mode helps to avoid it, and more, if one of the spoke sent a prune message to the hub, the other spoke would not 'hear' that and it would lost multicast packets (considering it has attached receivers).
Now, I would not say nbma-mode is always required.
If you mean real world, it would probably be using subinterface for each neighbor, so no need to use it here.
If you mean on the lab, as you said, nbma-mode is helpful only for sparse-mode.
A question:
You have spoke R2 and R3, both connected to hub R1. You want R2 and R3 receive multicast from R1. Must be dense mode. How can you solve the problem of R2 stop receiving multicast when R3 sends a prune to R1?
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