Re: [v6ops] Interesting problems with using IPv6
Andrew 👽 Yourtchenko <ayourtch@gmail.com> Wed, 10 September 2014 10:18 UTC
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Date: Wed, 10 Sep 2014 12:18:29 +0200
Message-ID: <CAPi140MmfaqG9kFNTdAi=RhH8YJDV2OVXYvi4FgxvkD_mEQx=Q@mail.gmail.com>
From: Andrew 👽 Yourtchenko <ayourtch@gmail.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Archived-At: http://mailarchive.ietf.org/arch/msg/v6ops/_OW6mBlTqnaxddXf6_e1vHTift0
Cc: Fernando Gont <fgont@si6networks.com>, v6ops@ietf.org
Subject: Re: [v6ops] Interesting problems with using IPv6
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On 9/10/14, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote: > On 10/09/2014 12:47, Fernando Gont wrote: >> On 09/09/2014 05:40 PM, Brian E Carpenter wrote: >>>>> Then, let me change the question: Why do I need MLD for *this*? >>> I think Brian Haberman's reply shows why that is the wrong question. >>> You need MLD for every multicast group, including a solicited-node >>> group, and if you insist on MLD snooping in the bridges (let's not >>> obfuscate by calling them switches) then you need to snoop every >>> solicited-node group. >>> >>> My question is orthogonal to MLD snooping: why do we require >>> router-alert >>> for MLD messages referring to a solicited-node group, since it by >>> definition is limited to a single L2 link (even if that link is >>> split up by bridges)? >> >> .. to avoid them being a special case? -- i.e., all MLD packets carry a >> Router Alert option. > > Yes, it would be an exception. But we know that HbH options in general > and Router Alert in particular are a serious performance issue, and > that all links carry this particular kind of MLD traffic, so an > exception seems like something to be discussed. How does this interact with the case where a "pure L2" switch within the link would want to snoop MLD ? Presumably, today the L2 switch would see the "router alert" and know that it needs to process this traffic. If this were to be removed, then it would be much trickier to direct the traffic to the slow path in that scenario, wouldn't it ? --a > >> And, actually, an MLD report could potentially >> include groups other than solicited-node (so you probably wouldn't want >> to turn the "include a router-alert" on and off). > > Sure, the exception would have to be for messages containing only > solicited-nodes data. > > Brian > > _______________________________________________ > v6ops mailing list > v6ops@ietf.org > https://www.ietf.org/mailman/listinfo/v6ops >
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Mark ZZZ Smith
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Philip Homburg
- Re: [v6ops] Interesting problems with using IPv6 Nick Hilliard
- Re: [v6ops] Interesting problems with using IPv6 Tore Anderson
- Re: [v6ops] Interesting problems with using IPv6 Nick Hilliard
- Re: [v6ops] Interesting problems with using IPv6 Lorenzo Colitti
- Re: [v6ops] Interesting problems with using IPv6 Hemant Singh (shemant)
- Re: [v6ops] Interesting problems with using IPv6 Chuck Anderson
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Hemant Singh (shemant)
- Re: [v6ops] Interesting problems with using IPv6 Andrew 👽 Yourtchenko
- Re: [v6ops] Interesting problems with using IPv6 Hemant Singh (shemant)
- Re: [v6ops] Interesting problems with using IPv6 Andrew 👽 Yourtchenko
- Re: [v6ops] Interesting problems with using IPv6 Brian Haberman
- Re: [v6ops] Interesting problems with using IPv6 神明達哉
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Andrew 👽 Yourtchenko
- Re: [v6ops] Interesting problems with using IPv6 Brian Haberman
- Re: [v6ops] Interesting problems with using IPv6 Brian Haberman
- Re: [v6ops] Interesting problems with using IPv6 Brian Haberman
- Re: [v6ops] Interesting problems with using IPv6 Andrew 👽 Yourtchenko
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 joel jaeggli
- Re: [v6ops] Interesting problems with using IPv6 Brian Haberman
- Re: [v6ops] Interesting problems with using IPv6 Ray Hunter
- Re: [v6ops] Interesting problems with using IPv6 Erik Nordmark
- Re: [v6ops] Interesting problems with using IPv6 Owen DeLong
- Re: [v6ops] Interesting problems with using IPv6 Chuck Anderson
- Re: [v6ops] Interesting problems with using IPv6 Fernando Gont
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Owen DeLong
- Re: [v6ops] Interesting problems with using IPv6 Owen DeLong
- Re: [v6ops] Interesting problems with using IPv6 Sander Steffann
- Re: [v6ops] Interesting problems with using IPv6 Bernie Volz (volz)
- Re: [v6ops] Interesting problems with using IPv6 Sander Steffann
- Re: [v6ops] Interesting problems with using IPv6 Owen DeLong
- Re: [v6ops] Interesting problems with using IPv6 Owen DeLong
- Re: [v6ops] Interesting problems with using IPv6 Mark ZZZ Smith
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Mikael Abrahamsson
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Erik Nordmark
- Re: [v6ops] Interesting problems with using IPv6 Nick Hilliard
- Re: [v6ops] Interesting problems with using IPv6 Brian E Carpenter
- Re: [v6ops] Interesting problems with using IPv6 Mikael Abrahamsson