Subject: [Idr] [Errata Held for Document Update] RFC4271 (5001)

From: RFC Errata System <[email-masked]>
Date: Thu, 27 Apr 2017 06:49:26 -0700 (PDT)

The following errata report has been held for document update 
for RFC4271, "A Border Gateway Protocol 4 (BGP-4)". 

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You may review the report below and at:
http://www.rfc-editor.org/errata_search.php?rfc=4271&eid=5001

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Status: Held for Document Update
Type: Editorial

Reported by: John Scudder <[email-masked]>
Date Reported: 2017-04-19
Held by: Alvaro Retana (IESG)

Section: 5

Original Text
-------------
   BGP implementations MUST recognize all well-known attributes.  Some
   of these attributes are mandatory and MUST be included in every
   UPDATE message that contains NLRI.  Others are discretionary and MAY
   or MAY NOT be sent in a particular UPDATE message.

Corrected Text
--------------
   BGP implementations MUST recognize all well-known attributes.  Some
   of these attributes are mandatory and MUST be included in every
   UPDATE message that contains NLRI.  Others are discretionary and may
   or may not be sent in a particular UPDATE message.

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". In context, it is unlikely the reader would be at risk of misinterpreting the text, but nonetheless it's a misuse of RFC 2119 terminology and difficult to parse if reading closely.

(The replacement text was suggested by Eric Rosen; thanks.)

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I updated the Corrected Text to simply use lower case wording, eliminating any rfc2119-related confusion. -- Alvaro.

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RFC4271 (draft-ietf-idr-bgp4-26)
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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