Key words for use in RFCs to Indicate Requirement Levels
RFC 2119

Document Type RFC - Best Current Practice (March 1997; Errata)
Updated by RFC 8174
Also known as BCP 14
Was draft-bradner-key-words (individual)
Author Scott Bradner 
Last updated 2020-01-21
Stream IETF
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IESG IESG state RFC 2119 (Best Current Practice)
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