Re: [Idr] [Technical Errata Reported] RFC4271 (5000)

<bruno.decraene@orange.com> Wed, 19 April 2017 19:43 UTC

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From: <bruno.decraene@orange.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Alvaro Retana (aretana)" <aretana@cisco.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] [Technical Errata Reported] RFC4271 (5000)
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Date: Wed, 19 Apr 2017 19:43:13 +0000
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Subject: Re: [Idr] [Technical Errata Reported] RFC4271 (5000)
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 > -----Original Message-----
 > From: Acee Lindem (acee)  > Sent: Wednesday, April 19, 2017 9:32 PM
> 
 > Hi Alvaro,
 > 
 > I would vote for John’s suggested option b. 

+1

--Bruno

"ineligible" does not seem ambiguous

> As John stated, this
 > disambiguates the statement in the context of RFC 2119’s definition of
 > “MAY”. From an implementation standpoint, I would see any other
 > interpretation as a bug.
 > 
 > Thanks,
 > Acee
 > 
 > 
 > 
 > On 4/19/17, 1:56 PM, "Idr on behalf of Alvaro Retana (aretana)"
 > <idr-bounces@ietf.org on behalf of aretana@cisco.com> wrote:
 > 
 > >[Cutting the distribution a little.]
 > >
 > >[John: thanks for filing this report.]
 > >
 > >idr WG:
 > >
 > >As you know, changes to rfc4271 should be handled with care.  And this
 > >case is no exception.
 > >
 > >Even if “MAY NOT” is not an rfc2119 keyword as “MAY”, “MUST NOT”, and
 > >others are, it doesn’t give me a great feeling to change it for one that
 > >is – among other things because the meaning of “MAY” and “MUST” is so
 > >different.  Of course, making me feel good is not the purpose of rfc2119…
 > >;-)
 > >
 > >Having said that, it is important that rfc4271 faithfully represent what
 > >the WG intended.  In this case, even though John didn’t say it
 > >explicitly, I would agree with him in considering that implementers may
 > >have already interpreted the text with the intent to not use the routes
 > >further.
 > >
 > >I would like to get input from the WG as to the best way to handle this
 > >report.  I would specially like to hear from implementers, but all input
 > >is welcome.
 > >
 > >The options are:
 > >
 > >a. s/MAY NOT/may not
 > >b. s/MAY NOT/MUST NOT
 > >c. Rejecting the report.
 > >d. Something else…
 > >
 > >I will wait at least a week before proceeding.
 > >
 > >Thanks!
 > >
 > >Alvaro.
 > >
 > >
 > >
 > >On 4/19/17, 1:37 PM, "RFC Errata System" <rfc-editor@rfc-editor.org>
 > >wrote:
 > >
 > >The following errata report has been submitted for RFC4271,
 > >"A Border Gateway Protocol 4 (BGP-4)".
 > >
 > >--------------------------------------
 > >You may review the report below and at:
 > >http://www.rfc-editor.org/errata_search.php?rfc=4271&eid=5000
 > >
 > >--------------------------------------
 > >Type: Technical
 > >Reported by: John Scudder <jgs@juniper.net>
 > >
 > >Section: 9.1.1
 > >
 > >Original Text
 > >-------------
 > >      If the route is learned from an external peer, then the local BGP
 > >      speaker computes the degree of preference based on preconfigured
 > >      policy information.  If the return value indicates the route is
 > >      ineligible, the route MAY NOT serve as an input to the next phase
 > >      of route selection; otherwise, the return value MUST be used as
 > >      the LOCAL_PREF value in any IBGP readvertisement.
 > >
 > >
 > >Corrected Text
 > >--------------
 > >      If the route is learned from an external peer, then the local BGP
 > >      speaker computes the degree of preference based on preconfigured
 > >      policy information.  If the return value indicates the route is
 > >      ineligible, the route MUST NOT serve as an input to the next phase
 > >      of route selection; otherwise, the return value MUST be used as
 > >      the LOCAL_PREF value in any IBGP readvertisement.
 > >
 > >
 > >Notes
 > >-----
 > >The original text uses "MAY NOT" capitalized as if it were an RFC 2119
 > >keyword. However, RFC 2119 does not have any defined meaning for "MAY
 > >NOT". If a reader were to interpret this text as suggesting it is
 > >optional -- meaning, in effect, "the route MAY serve as an input to the
 > >next phase of route selection" -- that would be wrong and potentially
 > >problematic.
 > >
 > >The minimal correction would be to use lower-case "may not", which makes
 > >the proper meaning reasonably clear. However, the English construct "may
 > >not" is notoriously ambiguous, therefore the proposed correction is "MUST
 > >NOT".
 > >
 > >Instructions:
 > >-------------
 > >This erratum is currently posted as "Reported". If necessary, please
 > >use "Reply All" to discuss whether it should be verified or
 > >rejected. When a decision is reached, the verifying party
 > >can log in to change the status and edit the report, if necessary.
 > >
 > >--------------------------------------
 > >RFC4271 (draft-ietf-idr-bgp4-26)
 > >--------------------------------------
 > >Title               : A Border Gateway Protocol 4 (BGP-4)
 > >Publication Date    : January 2006
 > >Author(s)           : Y. Rekhter, Ed., T. Li, Ed., S. Hares, Ed.
 > >Category            : DRAFT STANDARD
 > >Source              : Inter-Domain Routing
 > >Area                : Routing
 > >Stream              : IETF
 > >Verifying Party     : IESG
 > >
 > >
 > >_______________________________________________
 > >Idr mailing list
 > >Idr@ietf.org
 > >https://www.ietf.org/mailman/listinfo/idr
 > 
 > _______________________________________________
 > Idr mailing list
 > Idr@ietf.org
 > https://www.ietf.org/mailman/listinfo/idr

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