You should look at the extensive multicast work done in the LISP WG. 

Dino

> On Aug 30, 2014, at 4:37 PM, ramki Krishnan <[email protected]> wrote:
> 
> Dear All,
>  
> We would like to kick start discussions on the multicast draft - 
> https://datatracker.ietf.org/doc/draft-ghanwani-nvo3-app-mcast-framework/
>  
> From Section 3.2 “Replication at the source NVE”
> >> When a VPN client has multiple multicast groups, [RFC6513]
>      "Multicast VPN" combines all those multicast groups within each
>      VPN client to one single multicast group in the MPLS (or VPN)
>      core.  End result:  All messages from any multicast groups
>      belonging to one VPN client will reach all the PE nodes of the
>      client. I.e. any messages belonging to any multicast groups under
>      Client XX will reach all PEs of the Client XX. When the Client XX
>      only has a handful of PEs, there is not too much bandwidth wasted
>      in the core.
> One way to address this issue is to use replication at source NVE which will 
> make sure that the multicast traffic will get delivered only to those NVEs 
> where there are members; multicast groups don't get combined in any way. Are 
> there other ways of addressing this issue? Comments on this topic or other 
> comments on the draft would be much appreciated.
> Thanks,
> Ramki
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