Allocating and Retiring Special Purpose MPLS Labels
draft-ietf-mpls-special-purpose-labels-04

The information below is for an old version of the document
Document Type Active Internet-Draft (mpls WG)
Last updated 2014-02-11 (latest revision 2013-12-29)
Replaces draft-kompella-mpls-special-purpose-labels
Stream IETF
Intended RFC status Proposed Standard
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Document shepherd Ross Callon
Shepherd write-up Show (last changed 2014-01-30)
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Send notices to mpls-chairs@tools.ietf.org, draft-ietf-mpls-special-purpose-labels@tools.ietf.org
Network Working Group                                        K. Kompella
Internet-Draft                                          Juniper Networks
Updates: 3032, 3038, 3209, 3811, 4182, 4928, 5331,          L. Andersson
         5586, 5921, 5960, 6391, 6478, 6790 (if approved)         Huawei
                                                               A. Farrel
Intended status: Standards Track                        Juniper Networks
Expires: June 29, 2014                                 December 29, 2013

          Allocating and Retiring Special Purpose MPLS Labels
               draft-ietf-mpls-special-purpose-labels-04

Abstract

   Some MPLS labels have been allocated for specific purposes.  A block
   of labels (0-15) has been set aside to this end, and are commonly
   called "reserved labels".  They will be called "special purpose
   labels" in this document.

   As there are only 16 of these special purpose labels, caution is
   needed in the allocation of new special purpose labels, yet at the
   same time allow forward progress when one is called for.

   This memo defines new procedures to follow in the allocation and
   retirement of special purpose labels, as well as a method to extend
   the special purpose label space.  Finally, this memo renames the IANA
   registry for these labels to "Special Purpose MPLS Label Values", and
   creates a new one called the "Extended Special Purpose MPLS Label
   Values" registry.

   This document updates a number of previous RFCs that used the term
   "reserved label".

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 June 29, 2014.

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Copyright Notice

   Copyright (c) 2013 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Conventions used . . . . . . . . . . . . . . . . . . . . .  3
   2.  Questions  . . . . . . . . . . . . . . . . . . . . . . . . . .  4
   3.  Answers  . . . . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Extended Special Purpose MPLS Label Values . . . . . . . .  6
     3.2.  Process for Retiring Special Purpose Labels  . . . . . . .  7
   4.  Updated RFCs . . . . . . . . . . . . . . . . . . . . . . . . .  8
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . .  9
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 10
   7.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 10
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 11
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 11
     8.2.  Informational References . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

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1.  Introduction

   The specification of the Label Stack Encoding for Multi-Protocol
   Label Switching (MPLS) [RFC3032] defined four special purpose label
   values (0 to 3), and set aside values 4 through 15 for future use.
   These labels have special significance in both the control and the
   data plane.  Since then, three further values have been allocated
   (values 7, 13, and 14 in [RFC6790], [RFC5586] and [RFC3429],
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