Seamless Bidirectional Forwarding Detection (S-BFD) for IPv4, IPv6 and MPLS
draft-ietf-bfd-seamless-ip-03

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Document Type Active Internet-Draft (bfd WG)
Last updated 2016-04-13 (latest revision 2016-02-22)
Replaces draft-akiya-bfd-seamless-ip
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Internet Engineering Task Force                                 N. Akiya
Internet-Draft                                       Big Switch Networks
Intended status: Standards Track                            C. Pignataro
Expires: August 25, 2016                                         D. Ward
                                                           Cisco Systems
                                                       February 22, 2016

        Seamless Bidirectional Forwarding Detection (S-BFD) for
                          IPv4, IPv6 and MPLS
                     draft-ietf-bfd-seamless-ip-03

Abstract

   This document defines procedures to use Seamless Bidirectional
   Forwarding Detection (S-BFD) for IPv4, IPv6 and MPLS environments.

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
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   This Internet-Draft will expire on August 25, 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

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   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
   2.  S-BFD UDP Port  . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  S-BFD Echo UDP Port . . . . . . . . . . . . . . . . . . . . .   3
   4.  S-BFD Control Packet Demultiplexing . . . . . . . . . . . . .   3
   5.  Initiator Procedures  . . . . . . . . . . . . . . . . . . . .   3
     5.1.  Details of S-BFD Control Packet Sent by SBFDInitiator . .   4
       5.1.1.  Target vs. Remote Entity (S-BFD Discriminator)  . . .   4
   6.  Responder Procedures  . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Details of S-BFD Control Packet Sent by SBFDReflector . .   5
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   6
   10. Contributing Authors  . . . . . . . . . . . . . . . . . . . .   6
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   7
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   7
     11.2.  Informative References . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Seamless Bidirectional Forwarding Detection (S-BFD),
   [I-D.ietf-bfd-seamless-base], defines a generalized mechanism to
   allow network nodes to seamlessly perform continuity checks to remote
   entities.  This document defines necessary procedures to use S-BFD on
   IPv4, IPv6 and MPLS environments.

   The reader is expected to be familiar with the IP [RFC0791]
   [RFC2460], BFD [RFC5880], MPLS BFD [RFC5884], and S-BFD
   [I-D.ietf-bfd-seamless-base] terminologies and protocol constructs.

2.  S-BFD UDP Port

   A new UDP port is defined for the use of the S-BFD on IPv4, IPv6 and
   MPLS environments: 7784.  SBFDReflector session MUST listen for
   incoming S-BFD control packets on the port 7784.  SBFDInitiator
   sessions MUST transmit S-BFD control packets with destination port
   7784.  The source port of the S-BFD control packets transmitted by
   SBFDInitiator sessions can be any but MUST NOT be 7784.  The same UDP
   source port number MUST be used for all S-BFD control packets

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   associated with a particular SBFDInitiator session.  The source port
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