OSPF extensions to advertise S-BFD Target Discriminator
draft-ietf-ospf-sbfd-discriminator-03

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Document Type Active Internet-Draft (ospf WG)
Last updated 2016-04-12 (latest revision 2016-02-04)
Replaces draft-bhatia-ospf-sbfd-discriminator
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Intended RFC status Proposed Standard
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Send notices to "Acee Lindem" <acee@cisco.com>
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Internet Engineering Task Force                                M. Bhatia
Internet-Draft                                            Ionos Networks
Intended status: Standards Track                            C. Pignataro
Expires: August 7, 2016                                    Cisco Systems
                                                               S. Aldrin
                                                     Huawei Technologies
                                                            T. Ranganath
                                                          Alcatel-Lucent
                                                        February 4, 2016

        OSPF extensions to advertise S-BFD Target Discriminator
                 draft-ietf-ospf-sbfd-discriminator-03

Abstract

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

Requirements Language

   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].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on August 7, 2016.

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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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Relationship between OSPF and S-BFD . . . . . . . . . . .   2
   2.  Implementation  . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  S-BFD Discriminator TLV . . . . . . . . . . . . . . . . .   3
     2.2.  Flooding Scope  . . . . . . . . . . . . . . . . . . . . .   4
   3.  Backward Compatibility  . . . . . . . . . . . . . . . . . . .   5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   6
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   Seamless Bidirectional Forwarding Detection (S-BFD), specified in
   [I-D.ietf-bfd-seamless-base], is a simplified mechanism for using BFD
   with many negotiations eliminated.  This is achieved by using unique
   network-wide discriminators to identify the Network Targets (e.g., IP
   addresses).  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 LSA ([RFC4970]).

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

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   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.
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