Re: Multicast requirements

Dear Pete,

multicast mobility management is a route adaptation problem. As in the 
unicast case, mobility can only be treated by routing dynamics in 
trivial cases (re-connect of a tunnel, re-association with next hop). 
Otherwise it is unwise to delegate mobility adaptation to routing 
protocols (-> OSPF, BGP ...).

Accordingly, if DMM distributes mobility operations, handover management 
should foresee easy interconnects to previous distribution trees - both 
for receivers and for mobile multicast sources.

I guess, if DMM people are careful, this is not a world-class item and 
can be treated along the lines of unicast solutions - an isolated 
multicast protocol treatment (as has been previously proposed from 
MULTIMOB folks) seems inappropriate. In core PMIP, multicast treatment 
has turned out to work out simply (-> RFC6224).

Thus my argument: talk to the multicast guys before adopting a solution 
... and make the rest an easy game.

Cheers,

Thomas

On 12.11.2012 21:39, Peter McCann wrote:
> jouni korhonen wrote:
>> Folks,
>>
>> This mail is to kick off the discussion on multicast requirement(s)
>> for the draft-ietf-dmm-requirements-02 document. I hope we can nail
>> down the essential multicast requirement(s) as soon as possible.
>
> To me, multicast in a DMM environment means joining multicast
> groups directly from access routers.  It means re-joining the
> multicast tree from a new access router after handover.  I would
> hope that we can use existing MLD protocols between the MN and
> its first hop AR to accomplish this.
>
> -Pete
>
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-- 

Prof. Dr. Thomas C. Schmidt
° Hamburg University of Applied Sciences                   Berliner Tor 7 °
° Dept. Informatik, Internet Technologies Group    20099 Hamburg, Germany °
° http://www.haw-hamburg.de/inet                   Fon: +49-40-42875-8452 °
° http://www.informatik.haw-hamburg.de/~schmidt    Fax: +49-40-42875-8409 °