Hi Juan Liu, please see inline.
On 01.08.2012 19:27, [email protected] wrote: >> Message: 1 >> Date: Wed, 01 Aug 2012 16:01:56 -0700 >> From: "Thomas C. Schmidt" <[email protected]> >> To: "[email protected]" <[email protected]> >> Subject: [multimob] Direct Multicast Routing & the Deployment of >> PIM-SM >> Message-ID: <[email protected]> >> 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). This is different from what we refer to by the term "direct (or localized) routing". >> >> 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. 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 ° _______________________________________________ multimob mailing list [email protected] https://www.ietf.org/mailman/listinfo/multimob
