BFD Stability
draft-ietf-bfd-stability-00

Document Type Active Internet-Draft (bfd WG)
Last updated 2017-05-11
Replaces draft-ashesh-bfd-stability
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Routing Working Group                                          A. Mishra
Internet-Draft                                              O3b Networks
Intended status: Standards Track                         M. Jethanandani
Expires: November 12, 2017                                 Cisco Systems
                                                               A. Saxena
                                                       Ciena Corporation
                                                           S. Pallagatti
                                                        Juniper Networks
                                                                 M. Chen
                                                                  Huawei
                                                                  P. Fan
                                                            China Mobile
                                                            May 11, 2017

                             BFD Stability
                    draft-ietf-bfd-stability-00.txt

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 frame loss.

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

   This Internet-Draft will expire on November 12, 2017.

Mishra, et al.          Expires November 12, 2017               [Page 1]
Internet-Draft                BFD Stability                     May 2017

Copyright Notice

   Copyright (c) 2017 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
   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.  Use Cases . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  BFD Null-Authentication TLV . . . . . . . . . . . . . . . . .   3
   4.  Theory of Operations  . . . . . . . . . . . . . . . . . . . .   3
     4.1.  Loss Measurement  . . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Requirements . . . . . . . . . . . . . . . . . . . . . .   4
   6.  Security Consideration  . . . . . . . . . . . . . . . . . . .   4
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   4
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   4
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

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

   This document proposes a mechanism to detect lost frames 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 BFD extension to measure data traffic
   loss or delay on a link or tunnel and the scope is limited to BFD
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