Re: [homenet] Updates to Homenet Architecture Principles doc
Ray Hunter <v6ops@globis.net> Sun, 15 June 2014 10:51 UTC
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Date: Sun, 15 Jun 2014 12:51:11 +0200
From: Ray Hunter <v6ops@globis.net>
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To: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
References: <BEB843C7-EB1D-486A-A9A1-B99D48775D33@nominet.org.uk> <85F978F4-1293-4F9E-B5C7-068F95A0B626@nominet.org.uk> <CAKD1Yr2mzZOvCDwyyEZHef1rk5PAxtNZRVRys43SXnD=gVxLBA@mail.gmail.com> <143C7553-11D4-41A9-910E-FAD26F484635@fugue.com> <CAKD1Yr0hr8Pa_QU_9mjRjbxffQ=mdgOWYSQUyLc5ewkpuf5OmA@mail.gmail.com> <F08A2136-E88F-4785-BE01-14D386B9C2D9@fugue.com> <CAKD1Yr1nhnvG2H_9eeW-Dono3cZqYaxMZaCR1vcueOQgW4xqYQ@mail.gmail.com> <E66DDB31-C318-4025-BF8A-15F2336A2A08@fugue.com> <B289FE60-E0C7-4D3B-BE21-3C7109FAC69C@ecs.soton.ac.uk> <EMEW3|c9eee95ab0d06c016200d4557ca869f9q5CFPa03tjc|ecs.soton.ac.uk|B289FE60-E0C7-4D3B-BE21-3C7109FAC69C@ecs.soton.ac.uk> <539C51BA.6030901@globis.net> <87d2ebbmad.wl%jch@pps.univ-paris-diderot.fr> <539C67AA.4030501@globis.net> <87ioo35w49.wl%jch@pps.univ-paris-diderot.fr>
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Cc: "homenet@ietf.org Group" <homenet@ietf.org>
Subject: Re: [homenet] Updates to Homenet Architecture Principles doc
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Juliusz Chroboczek wrote: >> So even though link-local multicast may be part of the IPv6 base spec, >> it may be desirable to avoid use of multicast traffic where >> possible. e.g. a routing protocol could perform initial neighbor >> discovery using multicast, but then switch to unicast when maintaining >> individual neighbor associations on the longer term, or for exchanging >> information with specific neighbors. > > Ah, I see. Yes, that makes sense. > >>> Then I think I don't understand what is meant by "multi-path support". Is >>> that merely the ability to switch to a better route if one becomes >>> available? Or is there something more to it? Could you please clarify? > >> "The inclusion of physical layer characteristics including bandwidth, >> loss, and latency in path computation should be considered for >> optimising communication in the homenet." > >> I interpret the above text as requesting an ability to perform load >> balancing over equal cost paths, potentially taking into account packet >> loss and link quality when selecting which stream to send over which link. > > I don't. I interpret that as meaning that the routing protocol should be > able to pick a path using more refined criteria than just hop count. > E.g. to prefer a 1Gb/s link to a 100Mb/s one, or to prefer two wired hops > to a single wireless one. Doing that is not too difficult, and yields > dramatic performance improvements in some fairly simple, realistic > topologies. > > Load sharing is a completely different headache. Done carelessly, load > sharing causes issues with increased latency and jitter, and causes > intermittent connectivity problems that are very difficult to troubleshoot > if one of the links is unreliable. It also has ghastly performance if you > balance across wireless links without taking radio interference into account. > > While it's certainly an area worth experimenting with, I'd be cautious > about requiring load sharing in Homenet unless somebody knows how to do it > right in the general unadministered case. > > -- Juliusz > > Your interpretation of the current architecture text also seems perfectly valid, and is indeed much simpler to implement. Should the text then rather say "Path selection in Homenet needs to be more sophisticated than measuring pure hop count due to the use of heterogeneous link technologies, and therefore the routing protocol should be capable of utilising multiple link-dependent metrics, such as bandwidth, delay, and link reliability", rather than mentioning "optimised"? IMHO That revised text would provide a very clear selection criteria for preferring certain routing protocols over others. Or do you think the text is OK as is? -- Regards, RayH
- [homenet] Updates to Homenet Architecture Princip… Ray Bellis
- Re: [homenet] Updates to Homenet Architecture Pri… Markus Stenberg
- [homenet] Updates to Homenet Architecture Princip… Ray Bellis
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Markus Stenberg
- Re: [homenet] Updates to Homenet Architecture Pri… Mark Townsley
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Townsley.net
- Re: [homenet] Updates to Homenet Architecture Pri… Acee Lindem
- Re: [homenet] Updates to Homenet Architecture Pri… Townsley.net
- Re: [homenet] Updates to Homenet Architecture Pri… Michael Thomas
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Michael Thomas
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Acee Lindem
- Re: [homenet] Updates to Homenet Architecture Pri… Ray Hunter
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Michael Richardson
- Re: [homenet] Updates to Homenet Architecture Pri… Michael Richardson
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Brian E Carpenter
- Re: [homenet] Updates to Homenet Architecture Pri… Lorenzo Colitti
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Markus Stenberg
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Lorenzo Colitti
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Lorenzo Colitti
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Lorenzo Colitti
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Tim Chown
- Re: [homenet] Updates to Homenet Architecture Pri… Mark Townsley
- Re: [homenet] Updates to Homenet Architecture Pri… Tim Chown
- Re: [homenet] Updates to Homenet Architecture Pri… Tim Chown
- Re: [homenet] Updates to Homenet Architecture Pri… Mark Townsley
- Re: [homenet] Updates to Homenet Architecture Pri… Tim Chown
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Mark Townsley
- Re: [homenet] Updates to Homenet Architecture Pri… Brian E Carpenter
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Mark Townsley
- Re: [homenet] Updates to Homenet Architecture Pri… Ray Hunter
- Re: [homenet] Updates to Homenet Architecture Pri… Ted Lemon
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Ray Hunter
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Ray Hunter
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Ray Hunter
- Re: [homenet] Updates to Homenet Architecture Pri… Juliusz Chroboczek
- Re: [homenet] Updates to Homenet Architecture Pri… Acee Lindem
- Re: [homenet] Updates to Homenet Architecture Pri… Alexandru Petrescu
- Re: [homenet] Updates to Homenet Architecture Pri… Alexandru Petrescu
- Re: [homenet] Updates to Homenet Architecture Pri… Alexandru Petrescu
- Re: [homenet] Updates to Homenet Architecture Pri… Gert Doering
- Re: [homenet] Updates to Homenet Architecture Pri… Alexandru Petrescu
- Re: [homenet] Updates to Homenet Architecture Pri… Tim Chown
- Re: [homenet] Updates to Homenet Architecture Pri… ietfdbh
- Re: [homenet] Updates to Homenet Architecture Pri… joel jaeggli
- Re: [homenet] Updates to Homenet Architecture Pri… Tim Chown
- Re: [homenet] Updates to Homenet Architecture Pri… Ray Hunter
- Re: [homenet] list of questions on routing sectio… Alexandru Petrescu
- Re: [homenet] list of questions on routing section Alexandru Petrescu