Definitions for expressing standards requirements in IANA registries.

Document Type Expired Internet-Draft (individual in gen area)
Authors Ólafur Guðmundsson  , Scott Rose 
Last updated 2015-10-14 (latest revision 2010-01-27)
Stream Internet Engineering Task Force (IETF)
Intended RFC status Best Current Practice
Expired & archived
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Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state Expired (IESG: Dead)
Action Holders
Consensus Boilerplate Unknown
Telechat date
Responsible AD Russ Housley
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


RFC 2119 defines words that are used in IETF standards documents to indicate standards compliance. These words are fine for defining new protocols, but there are certain deficiencies in using them when it comes to protocol maintainability. Protocols are maintained by either updating the core specifications or via changes in protocol registries. For example, security functionality in protocols often relies upon cryptographic algorithms that are defined in external documents. Cryptographic algorithms have a limited life span, and new algorithms regularly phased in to replace older algorithms. This document proposes standard terms to use in protocol registries and possibly in standards track and informational documents to indicate the life cycle support of protocol features and operations.


Ólafur Guðmundsson (
Scott Rose (

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