OSPF Extensions to Advertise Seamless Bidirectional Forwarding Detection (S-BFD) Target Discriminators
RFC 7884

Document Type RFC - Proposed Standard (July 2016; No errata)
Last updated 2016-07-12
Replaces draft-bhatia-ospf-sbfd-discriminator
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Document shepherd Acee Lindem
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IESG IESG state RFC 7884 (Proposed Standard)
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Send notices to "Acee Lindem" <acee@cisco.com>
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Internet Engineering Task Force (IETF)                      C. Pignataro
Request for Comments: 7884                                         Cisco
Category: Standards Track                                      M. Bhatia
ISSN: 2070-1721                                           Ionos Networks
                                                               S. Aldrin
                                                     Huawei Technologies
                                                            T. Ranganath
                                                                   Nokia
                                                               July 2016

OSPF Extensions to Advertise Seamless Bidirectional Forwarding Detection
                     (S-BFD) Target Discriminators

Abstract

   This document defines a new OSPF Router Information (RI) TLV that
   allows OSPF routers to flood the Seamless Bidirectional Forwarding
   Detection (S-BFD) Discriminator values associated with a target
   network identifier.  This mechanism is applicable to both OSPFv2 and
   OSPFv3.

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
   http://www.rfc-editor.org/info/rfc7884.

Pignataro, et al.            Standards Track                    [Page 1]
RFC 7884              S-BFD Discriminators in OSPF             July 2016

Copyright Notice

   Copyright (c) 2016 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. Relationship between OSPF and S-BFD ........................3
   2. Implementation ..................................................3
      2.1. S-BFD Discriminator TLV ....................................4
      2.2. Flooding Scope .............................................4
   3. Backward Compatibility ..........................................5
   4. Security Considerations .........................................5
   5. IANA Considerations .............................................6
   6. References ......................................................6
      6.1. Normative References .......................................6
      6.2. Informative References .....................................6
   Acknowledgements ...................................................7
   Authors' Addresses .................................................7

Pignataro, et al.            Standards Track                    [Page 2]
RFC 7884              S-BFD Discriminators in OSPF             July 2016

1.  Introduction

   Seamless Bidirectional Forwarding Detection (S-BFD), specified in
   [RFC7880], is a simplified mechanism for using BFD with many
   negotiations eliminated.  This is achieved by using 4-octet
   discriminators, unique within an administrative domain, to identify
   the network targets.  These S-BFD Discriminators can be advertised by
   the IGPs, and this document concerns itself with OSPF.  Specifically,
   this document defines a new TLV (named the S-BFD Discriminator TLV)
   to be carried within the OSPF Router Information (RI) Link State
   Advertisement (LSA) [RFC7770].

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

1.1.  Relationship between OSPF and S-BFD

   This document implicitly defines a relationship between OSPF and
   S-BFD.  S-BFD assigns one or more discriminators to each S-BFD
   reflector node.  OSPF, in turn, learns about these from S-BFD and
   floods them in the newly defined TLV.  After this information is
   flooded, it is stored in all the OSPF nodes such that S-BFD
   initiators can map out target nodes to target discriminators and can
   therefore construct the S-BFD probe.

   When multiple S-BFD Discriminators are advertised, how a given
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