OSPF-TE Extensions for General Network Element Constraints
RFC 7580

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Internet Engineering Task Force (IETF)                          F. Zhang
Request for Comments: 7580                                        Y. Lee
Category: Standards Track                                         J. Han
ISSN: 2070-1721                                                   Huawei
                                                            G. Bernstein
                                                       Grotto Networking
                                                                   Y. Xu
                                                                    CATR
                                                               June 2015

       OSPF-TE Extensions for General Network Element Constraints

Abstract

   Generalized Multiprotocol Label Switching (GMPLS) can be used to
   control a wide variety of technologies including packet switching
   (e.g., MPLS), time division (e.g., Synchronous Optical Network /
   Synchronous Digital Hierarchy (SONET/SDH) and Optical Transport
   Network (OTN)), wavelength (lambdas), and spatial switching (e.g.,
   incoming port or fiber to outgoing port or fiber).  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 describes Open Shortest Path First (OSPF) routing protocol
   extensions to support these kinds of constraints under the control of
   GMPLS.

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/rfc7580.

Zhang, et al.                Standards Track                    [Page 1]
RFC 7580               Generic Constraint OSPF-TE              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. Conventions Used in This Document ..........................3
   2. Node Information ................................................3
      2.1. Connectivity Matrix ........................................4
   3. Link Information ................................................4
      3.1. Port Label Restrictions ....................................5
   4. Routing Procedures ..............................................5
   5. Scalability and Timeliness ......................................6
      5.1. Different Sub-TLVs into Multiple LSAs ......................6
      5.2. Decomposing a Connectivity Matrix into Multiple Matrices ...6
   6. Security Considerations .........................................7
   7. Manageability ...................................................7
   8. IANA Considerations .............................................8
      8.1. Node Information ...........................................8
      8.2. Link Information ...........................................8
   9. References ......................................................9
      9.1. Normative References .......................................9
      9.2. Informative References ....................................10
   Acknowledgments ...................................................11
   Contributors ......................................................11
   Authors' Addresses ................................................12

Zhang, et al.                Standards Track                    [Page 2]
RFC 7580               Generic Constraint OSPF-TE              June 2015

1.  Introduction

   Some data-plane technologies that require the use of a GMPLS control
   plane impose additional constraints on switching capability and label
   assignment.  In addition, some of these technologies should be
   capable of performing non-local label assignment based on the nature
   of the technology, e.g., wavelength continuity constraint in