Special Purpose Label terminology
draft-andersson-mpls-spl-terminology-01

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Last updated 2019-02-26
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MPLS Working Group                                          L. Andersson
Internet-Draft                                  Bronze Dragon Consulting
Updates: 3032, 7274 (if approved)                            K. Kompella
Intended status: Informational                          Juniper Networks
Expires: August 30, 2019                                       A. Farrel
                                                      Old Dog Consulting
                                                       February 26, 2019

                   Special Purpose Label terminology
                draft-andersson-mpls-spl-terminology-01

Abstract

   This document discusses and recommends a terminology that may be used
   when MPLS Special Purpose Labels (SPL) are specified and documented.

   Note: The rest of the text in this section is not really part of the
   abstract even though the text is placed here.  It is working notes.

   Note: At least at the moment it is not the intention to take this
   document to an RFC, but it might be polled to become a wg document to
   see if the MPLS working group agree on the proposed terminology.

   Note: The changes we propose are minor, but we might have to progress
   the document to RFC since there is a proposed change to the "Special-
   Purpose Multiprotocol Label Switching (MPLS) Label Values" registry.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on August 30, 2019.

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Copyright Notice

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  GMPLS Special Purpose Labels  . . . . . . . . . . . . . .   3
   3.  Terminology and Abbreviations . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   RFC 7274 [RFC7274] made some changes to the terminology used for MPLS
   Special Purpose Labels, but did not define consistent terminology.

   One thing that RFC 7274 did was to deprecate use use of the term
   "reserved labels" when describing a range of labels allocated from a
   registry maintained by IANA.  The term "Reserved" in such a registry
   means "set aside, not to be used", but that range of labels was
   available for allocation according to the policies set out in the
   registry.  The name "Special Purpose Labels" was introduced in RFC
   7274 in place of the previous term, and the abbreviation SPL was
   recommended.

   At the time of posting this Internet-Draft, the IETF is in the
   process of allocating the very first SPLs from the Extended SPL range
   [I-D.ietf-mpls-sfc].  This document discusses and recommends
   terminology and abbreviations to be used when talking about and
   documentating Special Purpose Labels.

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2.  Background

   Two sets of SPLs are defined for use in MPLS:

      The range of SPLs 0-15 is specified in RFC 3032 [RFC3032].
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