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Re: [MBONED] [pim] IGMPv3 backward compatibility issue killing SSM

Brian Haberman <brian@innovationslab.net> Thu, 22 February 2024 18:43 UTC

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Message-ID: <76454dcc-61ae-49bf-9c71-1b424994bcce@innovationslab.net>
Date: Thu, 22 Feb 2024 13:43:03 -0500
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To: Stig Venaas <stig@venaas.com>
Cc: "mboned@ietf.org" <mboned@ietf.org>, "pim@ietf.org" <pim@ietf.org>
References: <CAHANBtKf03ukXH4sgwN0WVdkaVXnbRYdAGBDmQK56YXrS-z6yA@mail.gmail.com> <CAHANBtKdfS0cPceqv8_R+ToeGOBdUksH7gArKqegqSt_Q0Sf0Q@mail.gmail.com> <ZXtzwBljE45Og27f@faui48e.informatik.uni-erlangen.de> <EDE809A0-E672-4A3B-9F46-E08ECD3D4C23@akamai.com> <edc9d539-4b6c-f238-54c6-210c152e2065@juniper.net> <e9ed1779-4f43-4f71-b8c3-d813bcea81d1@innovationslab.net> <532D7FE8-B721-4CF8-A54D-CF139BD8128B@ieee.org> <8DF64ABE-E20A-4C2C-A3D5-63ECEE24EA6C@juniper.net> <d8704ceb-932b-4878-ae3b-6e9cdc523078@innovationslab.net> <CAHANBt+yvv0DT7TYVc4FF5V9y42fHY=GvTYPw-K2ed1XTVLsXg@mail.gmail.com>
From: Brian Haberman <brian@innovationslab.net>
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Subject: Re: [MBONED] [pim] IGMPv3 backward compatibility issue killing SSM
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Hi Stig,

On 1/5/24 11:27 AM, Stig Venaas wrote:
> Hi Brian
> 
> I'm personally fine with no changes, if we make changes then I think
> they should be at most recommendations. Hopefully we will see more
> widespread IGMPv3 support and this will be less of an issue. It will
> also help if implementations have IGMPv3 enabled by default.
> 
> Section 7.2 is the more problematic part, but the issue is mainly with
> some unmanaged/unexpected device using version 1 or 2 I believe. If
> there are unexpected pim routers present or some pim router has wrong
> configuration, then things may break in many ways even if we were to
> address the v3 fallback. E.g. the unexpected device may become DR and
> not supporting v3 at all, or not having correct RP configuration.
> 

I have not seen any suggested text changes for 7.2 to address the 
unexpected use of v1 or v2. Still open to adding recommendations for 
default settings of the compatibility mode variables, but haven't heard 
anyone agreeing with such a change.

Regards,
Brian

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