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

Hi Thomas,

Thank you for your answer, please see inline:

multimob-bounces@ietf.org 写于 2012/08/02 10:45:44:

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>    1. Re:  Direct Multicast Routing & the Deployment of   PIM-SM(Juan
>       Liu) (Thomas C. Schmidt)
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> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Wed, 01 Aug 2012 19:45:40 -0700
> From: "Thomas C. Schmidt" <schmidt@informatik.haw-hamburg.de>
> To: liu.juan45@zte.com.cn
> Cc: multimob@ietf.org
> Subject: Re: [multimob] Direct Multicast Routing & the Deployment of
>    PIM-SM(Juan Liu)
> Message-ID: <5019E9D4.9040608@informatik.haw-hamburg.de>
> Content-Type: text/plain; charset=GB2312
> 
> Hi Juan Liu,
> 
> please see inline.
> 
> On 01.08.2012 19:27, liu.juan45@zte.com.cn wrote:
> 
> >> Message: 1
> >> Date: Wed, 01 Aug 2012 16:01:56 -0700
> >> From: "Thomas C. Schmidt" <schmidt@informatik.haw-hamburg.de>
> >> To: "multimob@ietf.org" <multimob@ietf.org>
> >> Subject: [multimob] Direct Multicast Routing & the Deployment  of
> >>    PIM-SM
> >> Message-ID: <5019B564.30709@informatik.haw-hamburg.de>
> >> 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?

Best regards,
Juan Liu

> 
> 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: 
+49-40-42875-8452 ?
> ? http://www.informatik.haw-hamburg.de/~schmidt    Fax: 
+49-40-42875-8409 ?
> 
> 
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