Guide lines for Key words use to indicate requirement levels in RFCs

Document Type Expired Internet-Draft (individual)
Authors Duekyoon Kang  , Shin Fang 
Last updated 1998-03-11
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


In many IETF documents several key words are used to signify the requirements in the spefcification. This document defines the requirement levels imposed by these words as they should be interpreted in IETF documments. The requirement levels are basically equivalent to the ones proposed by RFC 2119[1]. But easier to understand the strength of key words and to introduce new key words to the hierarchy of requirement levels if ever there's a need.


Duekyoon Kang (
Shin Fang (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)