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OSPF Traffic Engineering (TE) Metric Extensions
RFC 7471

Internet Engineering Task Force (IETF)                      S. Giacalone
Request for Comments: 7471                                  Unaffiliated
Category: Standards Track                                        D. Ward
ISSN: 2070-1721                                            Cisco Systems
                                                                J. Drake
                                                                A. Atlas
                                                        Juniper Networks
                                                              S. Previdi
                                                           Cisco Systems
                                                              March 2015

            OSPF Traffic Engineering (TE) Metric Extensions

Abstract

   In certain networks, such as, but not limited to, financial
   information networks (e.g., stock market data providers), network
   performance information (e.g., link propagation delay) is becoming
   critical to data path selection.

   This document describes common extensions to RFC 3630 "Traffic
   Engineering (TE) Extensions to OSPF Version 2" and RFC 5329 "Traffic
   Engineering Extensions to OSPF Version 3" to enable network
   performance information to be distributed in a scalable fashion.  The
   information distributed using OSPF TE Metric Extensions can then be
   used to make path selection decisions based on network performance.

   Note that this document only covers the mechanisms by which network
   performance information is distributed.  The mechanisms for measuring
   network performance information or using that information, once
   distributed, are outside the scope of this document.

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/rfc7471.

Giacalone, et al.            Standards Track                    [Page 1]
RFC 7471                OSPF TE Metric Extensions             March 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
   2. Conventions Used in This Document ...............................4
   3. TE Metric Extensions to OSPF TE .................................4
   4. Sub-TLV Details .................................................6
      4.1. Unidirectional Link Delay Sub-TLV ..........................6
           4.1.1. Type ................................................6
           4.1.2. Length ..............................................6
           4.1.3. Anomalous (A) Bit ...................................7
           4.1.4. Reserved ............................................7
           4.1.5. Delay Value .........................................7
      4.2. Min/Max Unidirectional Link Delay Sub-TLV ..................7
           4.2.1. Type ................................................7
           4.2.2. Length ..............................................7
           4.2.3. Anomalous (A) Bit ...................................8
           4.2.4. Reserved ............................................8
           4.2.5. Min Delay ...........................................8
           4.2.6. Reserved ............................................8
           4.2.7. Max Delay ...........................................8
      4.3. Unidirectional Delay Variation Sub-TLV .....................9
           4.3.1. Type ................................................9
           4.3.2. Length ..............................................9
           4.3.3. Reserved ............................................9
           4.3.4. Delay Variation .....................................9

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