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Re: [RTG-DIR] [babel] Rtgdir early review of draft-ietf-babel-source-specific-01

David Schinazi <dschinazi@apple.com> Thu, 09 November 2017 00:44 UTC

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From: David Schinazi <dschinazi@apple.com>
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Date: Wed, 08 Nov 2017 16:44:48 -0800
In-reply-to: <87po8sqp74.fsf@toke.dk>
Cc: Matthieu Boutier <boutier@irif.fr>, Joel Halpern <jmh@joelhalpern.com>, rtg-dir@ietf.org, draft-ietf-babel-source-specific.all@ietf.org, babel@ietf.org
To: Toke Høiland-Jørgensen <toke@toke.dk>
References: <150983039829.26601.3109842491855567125@ietfa.amsl.com> <5FA8E8AC-6BBB-45D0-BDF6-2241179A5477@irif.fr> <87po8sqp74.fsf@toke.dk>
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Subject: Re: [RTG-DIR] [babel] Rtgdir early review of draft-ietf-babel-source-specific-01
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$.02

Personally, if I receive something that the spec says you MUST NOT do I get upset at the packet.
Maybe I ignore the whole TLV, maybe the whole packet, maybe I summon the wrath of the Gods of the Internet.
If you expect that someone someday could find a use case for sending two sub-TLVs,
then I'd recommend explicitly saying MUST NOT send and on receive MUST drop TLV but not packet.
If you don't expect this to ever be useful, no need to specify it.

David


> On Nov 8, 2017, at 16:18, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> 
> Matthieu Boutier <boutier@irif.fr <mailto:boutier@irif.fr>> writes:
> 
>> Hi,
>> 
>> Thank's a lot for this early review.
>> 
>>> Please address the issues reported by id-nits.
>> 
>> Please accept my apologizes about these nits.
>> 
>>> The base Babel (bis) specification does not talk about the handling of
>>> duplicate sub-TLVs.  Are multiple source-specific sub-TLVs allowed on a given
>>> destination prefix advertisement?
>> 
>> I believe it is clear that a Babel node MUST NOT send two Source Prefix sub-TLVs
>> in one TLV.  But If a received TLV has two Source Prefix sub-TLVs, I hesitate:
>> does a node SHOULD or MUST ignore the whole TLV?
>> 
>> Does the list have an opinion?
> 
> Off the top of my head: Ignore the whole thing; better to fail
> (preferably loudly) than carry on with ambiguous semantics.
> 
> -Toke
> 
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