OSPF Traffic Engineering (OSPF-TE) Link Availability Extension for Links with Variable Discrete Bandwidth
RFC 8330

Document Type RFC - Proposed Standard (February 2018; No errata)
Last updated 2018-02-14
Replaces draft-long-ccamp-ospf-availability-extension
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Internet Engineering Task Force (IETF)                           H. Long
Request for Comments: 8330                                         M. Ye
Category: Standards Track                  Huawei Technologies Co., Ltd.
ISSN: 2070-1721                                                G. Mirsky
                                                                     ZTE
                                                         A. D'Alessandro
                                                   Telecom Italia S.p.A.
                                                                 H. Shah
                                                                   Ciena
                                                           February 2018

     OSPF Traffic Engineering (OSPF-TE) Link Availability Extension
               for Links with Variable Discrete Bandwidth

Abstract

   A network may contain links with variable discrete bandwidth, e.g.,
   microwave and copper.  The bandwidth of such links may change
   discretely in response to a changing external environment.  The word
   "availability" is typically used to describe such links during
   network planning.  This document defines a new type of Generalized
   Switching Capability-Specific Information (SCSI) TLV to extend the
   Generalized Multiprotocol Label Switching (GMPLS) Open Shortest Path
   First (OSPF) routing protocol.  The extension can be used for route
   computation in a network that contains links with variable discrete
   bandwidth.  Note that this document only covers the mechanisms by
   which the availability information is distributed.  The mechanisms by
   which availability information of a link is determined and the use of
   the distributed information for route computation are outside the
   scope of this document.  It is intended that technology-specific
   documents will reference this document to describe 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 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8330.

Long, et al.                 Standards Track                    [Page 1]
RFC 8330            Availability Extension to OSPF-TE      February 2018

Copyright Notice

   Copyright (c) 2018 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
   (https://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. Abbreviations ...................................................4
   3. Overview ........................................................4
   4. TE Metric Extension to OSPF-TE ..................................5
      4.1. Availability SCSI-TLV ......................................5
      4.2. Processing Procedures ......................................6
   5. Security Considerations .........................................6
   6. IANA Considerations .............................................7
   7. References ......................................................7
      7.1. Normative References .......................................7
      7.2. Informative References .....................................8
   Acknowledgments ...................................................10
   Authors' Addresses ................................................10

Long, et al.                 Standards Track                    [Page 2]
RFC 8330            Availability Extension to OSPF-TE      February 2018

1.  Introduction

   Some data-plane technologies, e.g., microwave and copper, allow
   seamless changes of maximum physical bandwidth through a set of known
   discrete values.  The parameter "availability", as described in
   [G.827], [F.1703], and [P.530], is often used to describe the link
   capacity.  The availability is a time scale, representing a
   proportion of the operating time that the requested bandwidth is
   ensured.  To set up a Label Switched Path (LSP) across these links,
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