Advertising Seamless Bidirectional Forwarding Detection (S-BFD) Discriminators in IS-IS
RFC 7883

Document Type RFC - Proposed Standard (July 2016; No errata)
Last updated 2016-07-12
Replaces draft-ginsberg-isis-sbfd-discriminator
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Shepherd write-up Show (last changed 2015-11-01)
IESG IESG state RFC 7883 (Proposed Standard)
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Internet Engineering Task Force (IETF)                       L. Ginsberg
Request for Comments: 7883                                 Cisco Systems
Category: Standards Track                                       N. Akiya
ISSN: 2070-1721                                      Big Switch Networks
                                                                 M. Chen
                                                                  Huawei
                                                               July 2016

    Advertising Seamless Bidirectional Forwarding Detection (S-BFD)
                        Discriminators in IS-IS

Abstract

   This document defines a means of advertising one or more Seamless
   Bidirectional Forwarding Detection (S-BFD) Discriminators using the
   IS-IS Router CAPABILITY TLV.

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/rfc7883.

Ginsberg, et al.             Standards Track                    [Page 1]
RFC 7883        Advertising S-BFD Discriminators in IS-IS      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
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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
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   Without obtaining an adequate license from the person(s) controlling
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   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Table of Contents

   1. Introduction ....................................................3
   2. Encoding Format .................................................3
   3. IANA Considerations .............................................4
   4. Security Considerations .........................................4
   5. Normative References ............................................4
   Acknowledgements ...................................................5
   Authors' Addresses .................................................5

Ginsberg, et al.             Standards Track                    [Page 2]
RFC 7883        Advertising S-BFD Discriminators in IS-IS      July 2016

1.  Introduction

   [RFC7880] defines a simplified mechanism for using Bidirectional
   Forwarding Detection (BFD) [RFC5880].  This mechanism depends on
   network nodes knowing the BFD Discriminators that each node in the
   network has reserved for this purpose.  The use of the Intermediate
   System to Intermediate System (IS-IS) [IS-IS] protocol is one
   possible means of advertising these discriminators.

   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].

2.  Encoding Format

   The IS-IS Router CAPABILITY TLV as defined in [RFC4971] will be used
   to advertise Seamless BFD (S-BFD) Discriminators.  A new sub-TLV is
   defined as described below.  S-BFD Discriminators sub-TLVs are
   formatted as specified in [RFC5305].

                                                  No. of octets
                 +-----------------------------+
                 | Type (20)                   |     1
                 +-----------------------------+
                 | Length (multiple of 4)      |     1
                 +-----------------------------+
                 | Discriminator Value(s)      |     4/Discriminator
                 :                             :
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