RE: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient-nd-04
Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu> Fri, 22 November 2013 11:29 UTC
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Date: Fri, 22 Nov 2013 12:29:04 +0100
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Subject: RE: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient-nd-04
From: Xavier Vilajosana Guillen <xvilajosana@eecs.berkeley.edu>
To: ipv6@ietf.org, Ole Troan <otroan@employees.org>, "Eric Levy- Abegnoli (elevyabe)" <elevyabe@cisco.com>
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Cc: 6man Chairs <6man-chairs@tools.ietf.org>
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Hi, I support the adoption of the draft. regards, Xavi ----- Original Message ----- From: "Eric Levy- Abegnoli (elevyabe)" <elevyabe@cisco.com> To: Ole Troan <otroan@employees.org>, 6man WG <ipv6@ietf.org> Cc: 6man Chairs <6man-chairs@tools.ietf.org> Sent: 11/21/2013 3:20 AM Subject: Re: 6MAN Adoption call on raft-chakrabarti-nordmark-6man-efficient= -nd-04 Hi, I support this draft: besides the operational value already mentioned, I can see all the cool things we would be able to do, to scale up the number of node on the link. Broadcasting on the link is quite fine when you have a limited number of addresses to deal with, and the dynamic is low. But we plan for layer-2 networks much bigger and much more dynamic (industrial, datacenter, very large campus) and broadcasting + caching is creating a bottleneck. I imagine we could also do routing with a cache instead of a table, and broadcast queries to find the destination prefix. Everybody would agree it does not scale. It's not just the numbers; it's also the dynamic. I ran a simple math: 100,000 nodes, 3 addresses each, 10% of nodes moving every minute (moves can be physical or virtual), 3 multicast messages sent per move (DAD, NA, MLD), message size could go from 100B to 1KB (when using CGA for instance), that would range from 1 Mbit to 8 Mbit/sec. Definitely an issue for the wireless links, but not only. Last but not least, there is quite a bit of latency involved when looking for a target that is not in cache. A cache is a good response to these problems, as long as the dynamic is low. But it's just a cache: when numbers grow, it can't keep up. And it=B9= s not designed to be distributed. Registration and dissemination (this draft, and sail-draft) propose a shift to a more pro-active approach, "a la" routing. Any node looking for an address on-link will either have it in its table (not cache) or will know who have it (that's the distribution part).The critical piece is not just registration; it's also distribution so that the information is available quickly where it's needed, along the forwarding path. There is a lot to clarify though: co-existence with the legacy model, distribution scheme (hierarchical, hash-based, =8A), nature of the registrars (Routers? Switches? DHCP servers? =8A). Eric On 19/11/13 11:45, "Ole Troan" <otroan@employees.org> wrote: >All, > >There was moderate support to adopt this draft at the working group >meeting in Vancouver. >This is an adoption call to confirm the result of the hum at the meeting. > >Please provide a view with reasons as to whether the WG should adopt this >or not. > >This message starts a one week 6MAN Working Group call on adopting: > > Title : Wired and Wireless IPv6 Neighbor Discovery >Optimizations > Author(s) : S. Chakrabarti, E. Nordmark, P. Thubert, M. Wasserman > Filename : draft-chakrabarti-nordmark-6man-efficient-nd-04 > Pages : 31 > Date : 2013-10-22 > > >http://tools.ietf.org/html/draft-chakrabarti-nordmark-6man-efficient-nd-04 > >The call ends on November 26th, 2013. > >Regards, > >Bob Hinden & Ole Tr=F8an >-------------------------------------------------------------------- >IETF IPv6 working group mailing list >ipv6@ietf.org >Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 >--------------------------------------------------------------------
- 6MAN Adoption call on raft-chakrabarti-nordmark-6… Ole Troan
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Dan Luedtke
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Erik Nordmark
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Erik Kline
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Erik Nordmark
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mark ZZZ Smith
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Dan Luedtke
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Pascal Thubert (pthubert)
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Suresh Krishnan
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Eric Levy- Abegnoli (elevyabe)
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Xavier Vilajosana Guillen
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Hosnieh Rafiee
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Maria Rita PALATTELLA
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Anders Brandt
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Pascal Thubert (pthubert)
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Acee Lindem
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Samita Chakrabarti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mark ZZZ Smith
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mikael Abrahamsson
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Samita Chakrabarti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mikael Abrahamsson
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Samita Chakrabarti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mikael Abrahamsson
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mikael Abrahamsson
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mikael Abrahamsson
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Ole Troan
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mikael Abrahamsson
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Mikael Abrahamsson
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Lorenzo Colitti
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Havard Eidnes
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Sander Steffann
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Eric Vyncke (evyncke)
- Re: 6MAN Adoption call on raft-chakrabarti-nordma… Andrew 👽 Yourtchenko
- RE: 6MAN Adoption call on raft-chakrabarti-nordma… Samita Chakrabarti