BFD Stability
draft-ietf-bfd-stability-06

Document Type Active Internet-Draft (bfd WG)
Last updated 2020-07-13
Replaces draft-ashesh-bfd-stability
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Network Working Group                                          A. Mishra
Internet-Draft                                                       SES
Intended status: Standards Track                         M. Jethanandani
Expires: January 14, 2021                                 Kloud Services
                                                               A. Saxena
                                                       Ciena Corporation
                                                           S. Pallagatti
                                                                  VmWare
                                                                 M. Chen
                                                                  Huawei
                                                                  P. Fan
                                                            China Mobile
                                                           July 13, 2020

                             BFD Stability
                      draft-ietf-bfd-stability-06

Abstract

   This document describes extensions to the Bidirectional Forwarding
   Detection (BFD) protocol to measure BFD stability.  Specifically, it
   describes a mechanism for detection of BFD packet loss.

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 https://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
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on January 14, 2021.

Copyright Notice

   Copyright (c) 2020 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

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   (https://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
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   3.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  BFD Null-Authentication Type  . . . . . . . . . . . . . . . .   3
   5.  Theory of Operation . . . . . . . . . . . . . . . . . . . . .   3
     5.1.  Loss Measurement  . . . . . . . . . . . . . . . . . . . .   3
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   7.  Security Consideration  . . . . . . . . . . . . . . . . . . .   4
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   4
   9.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   10. Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The Bidirectional Forwarding Detection ( BFD) [RFC5880] protocol
   operates by transmitting and receiving BFD control packets, generally
   at high frequency, over the datapath being monitored.  In order to
   prevent significant data loss due to a datapath failure, BFD session
   detection time as defined in BFD [RFC5880] is set to the smallest
   feasible value.

   This document proposes a mechanism to detect lost packet in a BFD
   session in addition to the datapath fault detection mechanisms of
   BFD.  Such a mechanism presents significant value to measure the
   stability of BFD sessions and provides data to the operators for the
   cause of a BFD failure.

   This document does not propose any BFD extension to measure data
   traffic loss or delay on a link or tunnel and the scope is limited to
   BFD packets.

2.  Terminology

   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] and
   RFC 8174 [RFC8174].

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   The reader is expected to be familiar with the BFD [RFC5880],
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