Extended Bidirectional Forwarding Detection
draft-mirmin-bfd-extended-02

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BFD Working Group                                              G. Mirsky
Internet-Draft                                                    X. Min
Intended status: Standards Track                               ZTE Corp.
Expires: April 12, 2020                                 October 10, 2019

              Extended Bidirectional Forwarding Detection
                      draft-mirmin-bfd-extended-02

Abstract

   This document describes a mechanism to extend the capabilities of
   Bidirectional Forwarding Detection (BFD).  These extensions enable
   BFD to measure performance metrics like packet loss and packet delay.
   Also, a method to perform lightweight on-demand authentication is
   defined in this specification.

Status of This Memo

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

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   This Internet-Draft will expire on April 12, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Mirsky & Min             Expires April 12, 2020                 [Page 1]
Internet-Draft                Extended BFD                  October 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Extended BFD Control Message  . . . . . . . . . . . . . . . .   3
     3.1.  Extended BFD Capability Negotiation . . . . . . . . . . .   5
     3.2.  Padding TLV . . . . . . . . . . . . . . . . . . . . . . .   6
     3.3.  Diagnostic TLV  . . . . . . . . . . . . . . . . . . . . .   7
     3.4.  Performance Measurement with Extended BFD Control Message   8
     3.5.  Lightweight Authentication  . . . . . . . . . . . . . . .   9
       3.5.1.  Lightweight Authentication Mode Negotiation . . . . .  10
       3.5.2.  Using Lightweight Authentication  . . . . . . . . . .  11
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
     4.1.  Extended BFD Message Types  . . . . . . . . . . . . . . .  12
     4.2.  Lightweight Authentication Modes  . . . . . . . . . . . .  13
     4.3.  Return Codes  . . . . . . . . . . . . . . . . . . . . . .  14
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  15
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .  15
     6.2.  Informative References  . . . . . . . . . . . . . . . . .  15
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   [RFC5880] has provided the base specification of Bidirectional
   Detection (BFD) as the light-weight mechanism to monitor a path
   continuity between two systems and detect a failure in the data-
   plane.  Since its introduction, BFD has been broadly deployed.  There
   were several attempts to introduce new capabilities in the protocol,
   some more successful than others.  One of the significant obstacles
   to extending BFD capabilities may be seen in the compact format of
   the BFD control message.  This document introduces an Extended BFD
   control message and describes the use of the new format for new BFD
   capabilities.

   The Extended BFD protocol may be seen as the Operations,
   Administration, and Maintenance (OAM) protocol that provides both
   Fault Management (FM) Performance Monitoring (PM) OAM functions.  In
   some networks, for example in a Deterministic Networking (DetNet)
   domain [I-D.ietf-detnet-architecture], it is easier to ensure that a
   test packet of a single OAM protocol is fate-sharing with data
   packets rather than map several FM amd PM OAM protocols to that