General Network Element Constraint Encoding for GMPLS-Controlled Networks
RFC 7579

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Internet Engineering Task Force (IETF)                 G. Bernstein, Ed.
Request for Comments: 7579                             Grotto Networking
Category: Standards Track                                    Y. Lee, Ed.
ISSN: 2070-1721                                                    D. Li
                                                                  Huawei
                                                              W. Imajuku
                                                                     NTT
                                                                  J. Han
                                                                  Huawei
                                                               June 2015

              General Network Element Constraint Encoding
                     for GMPLS-Controlled Networks

Abstract

   Generalized Multiprotocol Label Switching (GMPLS) can be used to
   control a wide variety of technologies.  In some of these
   technologies, network elements and links may impose additional
   routing constraints such as asymmetric switch connectivity, non-local
   label assignment, and label range limitations on links.

   This document provides efficient, protocol-agnostic encodings for
   general information elements representing connectivity and label
   constraints as well as label availability.  It is intended that
   protocol-specific documents will reference this memo to describe how
   information is carried for specific uses.

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 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7579.

Bernstein, et al.            Standards Track                    [Page 1]
RFC 7579       General Network Element Constraint Encoding     June 2015

Copyright Notice

   Copyright (c) 2015 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
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1. Introduction ....................................................3
      1.1. Node Switching Asymmetry Constraints .......................3
      1.2. Non-local Label Assignment Constraints .....................4
      1.3. Conventions Used in This Document ..........................4
   2. Encoding ........................................................4
      2.1. Connectivity Matrix Field ..................................5
      2.2. Port Label Restrictions Field ..............................6
           2.2.1. SIMPLE_LABEL ........................................8
           2.2.2. CHANNEL_COUNT .......................................8
           2.2.3. LABEL_RANGE .........................................9
           2.2.4. SIMPLE_LABEL & CHANNEL_COUNT ........................9
           2.2.5. LINK_LABEL_EXCLUSIVITY .............................10
      2.3. Link Set Field ............................................10
      2.4. Available Labels Field ....................................12
      2.5. Shared Backup Labels Field ................................13
      2.6. Label Set Field ...........................................14
   3. Security Considerations ........................................16
   4. IANA Considerations ............................................17
   5. References .....................................................17
      5.1. Normative References ......................................17
      5.2. Informative References ....................................18
   Appendix A. Encoding Examples .....................................19
      A.1. Link Set Field ............................................19
      A.2. Label Set Field ...........................................19
      A.3. Connectivity Matrix .......................................20
      A.4. Connectivity Matrix with Bidirectional Symmetry ...........24
      A.5. Priority Flags in Available/Shared Backup Labels ..........26
   Contributors ......................................................27