Juniper Networks

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RTG lsr RFC 5029, "Definition of an IS-IS Link Attribute Sub-TLV", defines an IANA registry called "IS-IS Neighbor Link-Attribute Bit Values". This document changes the registration procedure for that registry from "Standards Action" to "Expert Review". This document updates RFC 5029.

Status of This Memo This is an Internet Standards Track document. This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841. Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at .

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Table of Contents

• .  Introduction
• .  IANA Considerations
• .  Security Considerations
• .  References
  • .  Normative References
  • .  Informative References
• Acknowledgements
• Author's Address

Introduction defines the "IS-IS Neighbor Link-Attribute Bit Values" registry and specifies a registration procedure of "Standards Action". In practice, this registration procedure is unnecessarily restrictive, as it prevents allocation of bits to experimental protocols, which in turn increases the risk of conflicts introduced by use of unregistered code points (so-called "code point squatting"). Accordingly, this document changes the registration procedure for the registry, as described in .

IANA Considerations IANA has changed the registration procedure for the "IS-IS Neighbor Link-Attribute Bit Values" registry to "Expert Review" and has listed this document as a reference for the registry. General guidance for the designated experts is defined in , and more specific guidance can be found in .

Security Considerations This document does not affect the security issues discussed in .

References Normative References This document defines a sub-TLV called "Link-attributes" carried within the TLV 22 and used to flood some link characteristics. [STANDARDS-TRACK] Informative References This document recommends some editorial changes to the IANA "IS-IS TLV Codepoints" registry to more accurately document the state of the protocol. It also sets out new guidelines for Designated Experts to apply when reviewing allocations from the registry. Many protocols make use of points of extensibility that use constants to identify various protocol parameters. To ensure that the values in these fields do not have conflicting uses and to promote interoperability, their allocations are often coordinated by a central record keeper. For IETF protocols, that role is filled by the Internet Assigned Numbers Authority (IANA). To make assignments in a given registry prudently, guidance describing the conditions under which new values should be assigned, as well as when and how modifications to existing values can be made, is needed. This document defines a framework for the documentation of these guidelines by specification authors, in order to assure that the provided guidance for the IANA Considerations is clear and addresses the various issues that are likely in the operation of a registry. This is the third edition of this document; it obsoletes RFC 5226.

Acknowledgements The author would like to thank for his contributions.

Author's Address Juniper Networks

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