Re: [multimob] Direct Multicast Routing & the Deployment of PIM-SM(Juan Liu)

["Thomas C. Schmidt" <[e-mail]>]

Hi Juan Liu,

thanks - please see inline.

On 01.08.2012 22:17, [e-mail] wrote:

>> Message: 1
>> Date: Wed, 01 Aug 2012 19:45:40 -0700
>> From: "Thomas C. Schmidt" <[e-mail]>
>> To: [e-mail]
>> Cc: [e-mail]
>> Subject: Re: [multimob] Direct Multicast Routing & the Deployment  of
>>    PIM-SM(Juan Liu)
>> Message-ID: <[e-mail]>
>> Content-Type: text/plain; charset=GB2312
>>
>> Hi Juan Liu,
>>
>> please see inline.
>>
>> On 01.08.2012 19:27, [e-mail] wrote:
>>
>> >> Message: 1
>> >> Date: Wed, 01 Aug 2012 16:01:56 -0700
>> >> From: "Thomas C. Schmidt" <[e-mail]>
>> >> To: "[e-mail]" <[e-mail]>
>> >> Subject: [multimob] Direct Multicast Routing & the Deployment   of
>> >>    PIM-SM
>> >> Message-ID: <[e-mail]>
>> >> Content-Type: text/plain; charset=ISO-8859-15; format=flowed
>> >>
>> >> Hi all,
>> >>
>> >> after Monday's presentation of PIM deployment options
>> >> (draft-ietf-multimob-pmipv6-source), there was the discussion  on further
>> >> optimization options. In detail, the idea was raised to reach  MNs  not
>> >> via their (permanent) HNP advertisements at the LMA, but  directly  at
>> >> their current MAGs. The latter would require a dynamic unicast  routing
>> >> protocol in the access network.
>>
>> > In order that multicast traffic reach MNs directly via MAG-MAG  tunnel not
>> > via LMA-MAG tunnel,MRIB can be constructed using route from the  tunnel
>> > between MAGs(draft-liu-multimob-pmipv6-multicast-ro).
>>
>> The scenario of your draft is a completely different one: If I
>> understood correctly, you distribute traffic in an overlay. (construct  a
>> mesh of tunnels between MAGs, inquire routes to MNs via an LMA-based
>> on-demand search and then select the proper tunnel for forwarding).
> Yes, you are right.
>>
>> This is different from what we refer to by the term "direct (or
>> localized) routing".
> This is somewhat similar to LR solution in the sense of routing via
> MAG-MAG tunnel.
>>
>> >>
>> >> I promised to talk to Sri about this (underlying unicast)  approach.  As
>> >> expected, Sri emphasized that the PMIP WGs intentionally  do *not*
>> >> consider this a working option. The reason is that node mobility
>> >> typically is more intense and faster than unicast routing  dynamics.
>> >> Advertising MN's HNPs throughout the access network would  cause route
>> >> pollution and convergence problems and quickly lead to inconsistencies.
>> >> For the unicast case, this is the equivalent of pushing multicast
>> >> mobility management into multicast routing, which we equally  avoid.
>>
>> > About the working option you talk with Sri,does it refer to direct
>> > routing via MAGs,
>> > which in PMIP WG unicast routing through MAG-MAG tunnel is an  acceptable
>> > optimization
>> > options for PMIPv6 routing. Hope i'm not wrong about this.
>>
>> We didn't talk about overlay solutions. We just addressed the
>> straight-forward deployment of dynamic unicast routing protocols like
>> iBGP or OSPF. So nothing was said about your draft.
> Now i see :)
>
> Then will it be possible to adopt our overlay solution as the optimization
> option with your draft?
>

Please allow some time to study your proposal in detail. We'll try to 
provide a review soon.

Best regards,

Thomas


>>
>> Best regards,
>>
>> Thomas
>>
>> --
>>
>> 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: [phone] ?
>> ? http://www.informatik.haw-hamburg.de/~schmidt    Fax:  [phone] ?
>>
>>
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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: [phone] °
° http://www.informatik.haw-hamburg.de/~schmidt    Fax: [phone] °