Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13

"John G. Scudder" <jgs@juniper.net> Fri, 06 April 2018 13:24 UTC

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From: "John G. Scudder" <jgs@juniper.net>
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Date: Fri, 6 Apr 2018 09:24:39 -0400
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Cc: Alvaro Retana <aretana.ietf@gmail.com>, "idr-chairs@ietf.org" <idr-chairs@ietf.org>, "draft-ietf-idr-bgp-gr-notification@ietf.org" <draft-ietf-idr-bgp-gr-notification@ietf.org>, "idr@ietf. org" <idr@ietf.org>
To: bruno.decraene@orange.com
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/HU9az7wBnzgjQYKBoaf58KPoRgg>
Subject: Re: [Idr] AD Review of draft-ietf-idr-bgp-gr-notification-13
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Hi Bruno

No comments on your a/b/c options which as you point out would be more applicable if we had a clean sheet instead of existing implementations. A few other remarks below.

> On Apr 6, 2018, at 4:55 AM, bruno.decraene@orange.com wrote:
> 
>> It's true that we could specify both options -- Hard Reset (necessity argued above), plus specified semantics for existing ("legacy") notification types, but I've never been a fan of having two different code paths where one will do, especially when the one is what's already implemented.
>  
> [Bruno] IMHO, the introduction of the Hard Reset encapsulation already introduces the 2 code paths ( [Code, subcode] , [Cease, Hard Reset, Code, subcode]) and the question is only about the behavior for each path.

Sorry, I meant "two code paths to achieve the same semantics".
 
>> One thing this discussion does make me think, is that it might be worth adding some advice to implementors to the spec, for which notification types should always be wrapped up in a Hard Reset. 
> [Bruno] If “should always” translates as “MUST” then the draft needs to also specify the error handling when the original signaling is sent.

I meant "should always" in a much weaker sense, and the draft language I have in my edit buffer (hopefully) makes that clear. I think it should be an implementation choice when to send a hard reset vs. a regular one (maybe we should call the latter a "graceful" reset), but it does seem useful to offer guidance to implementors when we have something useful to say.

I'll share a proposed revision once I've finished coming up to date with the mail thread.

Thanks,

--John