[Idr] [Editorial Errata Reported] RFC4271 (6498)

RFC Errata System <rfc-editor@rfc-editor.org> Sat, 27 March 2021 20:16 UTC

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Subject: [Idr] [Editorial Errata Reported] RFC4271 (6498)
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The following errata report has been submitted for RFC4271,
"A Border Gateway Protocol 4 (BGP-4)".

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You may review the report below and at:
https://www.rfc-editor.org/errata/eid6498

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Type: Editorial
Reported by: Graham Paasch <grahampaasch@gmail.com>

Section: 5.1.5

Original Text
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LOCAL_PREF is a well-known attribute that SHALL be included in all UPDATE messages that a given BGP speaker sends to other internal peers. 

Corrected Text
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LOCAL_PREF is a well-known discretionary attribute that SHALL be included in all UPDATE messages that a given BGP speaker sends to other internal peers. 

Notes
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It is unclear from the text to which of the four path attribute categories LOCAL_PREF belongs. There was even submitted an errata to create a fifth category for this attribute, but it is clear from the definition of the categories, that this attribute is well known discretionary. All routers must be capable of sending or receiving the LOCAL_PREF attribute, however it is up to a routers discretion whether to include that attribute in an UPDATE message.

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-------------
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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