On Tue, Oct 30, 2018 at 03:33:21PM +0000, Acee Lindem (acee) wrote:
> Hi Les,
> 
> On 10/30/18, 11:15 AM, "Les Ginsberg (ginsberg)" <ginsb...@cisco.com> wrote:
> 
>     Acee -
>     
>     >     > Section 3.2
>     >     >
>     >     > "When a router receives multiple overlapping ranges, it MUST
>     >     >        conform to the procedures defined in
>     >     >        [I-D.ietf-spring-segment-routing-mpls]."
>     >     >
>     >     > It would be useful to include a section pointer here.  I think 
> your referring
>     >     > to Section 2.3 where the router ignores the range?   Is it likely 
> that will
>     >     > change to something other than "ignore?"  If not, maybe it's just 
> worth
>     >     > mentioning that here.
>     > 
>     >     ##PP
>     >     I don't think it is good to specify the behavior which is described
>     >     somewhere else. Regarding the section, the
>     >     ietf-spring-segment-routing-mpls is still being worked on and the
>     >     section may changes. We used the same text in OSPFv2 and ISIS SR 
> drafts.
>     >     I would like to be consistent here.
>     > 
>     > Given that this is a normative reference, I don't think it would create 
> too
>     > much of a dependency to include the section in the reference. We've had 
> a
>     > protracted discussion (1-2 years) on the whole SID overlap topic in 
> SPRING
>     > and I believe we've finally come up with behavior and the specification 
> of
>     > such behavior with which everyone agree (or at least doesn't strongly
>     > disagree).
>     > 
>     [Les:] I strongly agree with Peter (and disagree with you).
>     Why would we want to risk having an incorrect section reference to a 
> document which is still being revised? This needlessly introduces a 
> dependency such that if the section numbering changes in the SR-MPLS draft we 
> would then have to update the dependent document(s).
>     Note this has nothing to do with the SID overlap discussion itself. The 
> compelling reason to NOT discuss this in the IGP documents but simply refer 
> to the document that defines the solution is so that whatever the outcome in 
> SPRING the IGP documents do not also have to be changed.
> 
> While I don't feel as strongly as either of you, this could improve the 
> readability. For example, if you read RFC 8362 you'll see that I have 
> referred extensively to sections in RFC 5340. I may be overoptimistic but I'm 
> hoping we are finally done with the SR-MPLS draft as it is blocking all our 
> LSR SR documents. 

I also agree that specific section references can (in general) aid
readability.  And there's always "[RFC Editor: please check with authors
during AUTH48 that the section reference remains correct]"; we've done
essentially that on a document I was shepherding in the past.

-Benjamin

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