{
  "draft": "draft-ietf-mpls-special-purpose-labels-06",
  "doc_id": "RFC7274",
  "title": "Allocating and Retiring Special-Purpose MPLS Labels",
  "authors": [
    "K. Kompella",
    "L. Andersson",
    "A. Farrel"
  ],
  "format": [
    "TEXT",
    "HTML"
  ],
  "page_count": "11",
  "pub_status": "PROPOSED STANDARD",
  "status": "PROPOSED STANDARD",
  "source": "Multiprotocol Label Switching",
  "abstract": "Some MPLS labels have been allocated for specific purposes. A block of labels (0-15) has been set aside to this end; these labels are commonly called \"reserved labels\". They will be called \"special-purpose labels\" in this document.\n\n 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, forward progress should be allowed when one is called for.\n\n This memo defines new procedures for the allocation and retirement of special-purpose labels, as well as a method to extend the special-purpose label space and a description of how to handle extended special-purpose labels in the data plane. Finally, this memo renames the IANA registry for special-purpose labels to \"Special-Purpose MPLS Label Values\" and creates a new registry called the \"Extended Special-Purpose MPLS Label Values\" registry.\n\n This document updates a number of previous RFCs that use the term \"reserved label\". Specifically, this document updates RFCs 3032, 3038, 3209, 3811, 4182, 4928, 5331, 5586, 5921, 5960, 6391, 6478, and 6790.",
  "pub_date": "June 2014",
  "keywords": [],
  "obsoletes": [],
  "obsoleted_by": [],
  "updates": [
    "RFC3032",
    "RFC3038",
    "RFC3209",
    "RFC3811",
    "RFC4182",
    "RFC4928",
    "RFC5331",
    "RFC5586",
    "RFC5921",
    "RFC5960",
    "RFC6391",
    "RFC6478",
    "RFC6790"
  ],
  "updated_by": [
    "RFC9017"
  ],
  "see_also": [],
  "doi": "10.17487/RFC7274",
  "errata_url": null
}