Advertising S-BFD Discriminators in IS-IS
draft-ietf-isis-sbfd-discriminator-00

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Last updated 2014-10-02
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Networking Working Group                                     L. Ginsberg
Internet-Draft                                                  N. Akiya
Intended status: Standards Track                           Cisco Systems
Expires: March 27, 2015                                          M. Chen
                                                                  Huawei
                                                      September 23, 2014

               Advertising S-BFD Discriminators in IS-IS
               draft-ietf-isis-sbfd-discriminator-00.txt

Abstract

   This document defines a means of advertising one or more S-BFD
   Discriminators using the IS-IS Router Capability TLV.

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
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   This Internet-Draft will expire on March 27, 2015.

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents

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   carefully, as they describe your rights and restrictions with respect
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   the Trust Legal Provisions and are provided without warranty as
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   than English.

Table of Contents

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

1.  Introduction

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

2.  Encoding Format

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

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                                                  No. of octets
                 +-----------------------------+
                 | Type (to be assigned by     |     1
                 | IANA - suggested value 19)  |
                 +-----------------------------+
                 | Length (multiple of 4)      |     1
                 +-----------------------------+
                 | Discriminator Value(s)      |     4/Discriminator
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