Unaffiliated BFD Echo Function
draft-ietf-bfd-unaffiliated-echo-01

Document Type Active Internet-Draft (bfd WG)
Authors Weiqiang Cheng  , Ruixue Wang  , Xiao Min  , Reshad Rahman  , Raj Boddireddy 
Last updated 2020-11-02
Replaces draft-cw-bfd-unaffiliated-echo
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BFD Working Group                                               W. Cheng
Internet-Draft                                                   R. Wang
Updates: 5880 (if approved)                                 China Mobile
Intended status: Standards Track                                  X. Min
Expires: May 6, 2021                                           ZTE Corp.
                                                               R. Rahman
                                                           Cisco Systems
                                                           R. Boddireddy
                                                        Juniper Networks
                                                        November 2, 2020

                     Unaffiliated BFD Echo Function
                  draft-ietf-bfd-unaffiliated-echo-01

Abstract

   Bidirectional Forwarding Detection (BFD) is a fault detection
   protocol that can quickly determine a communication failure between
   two forwarding engines.  This document proposes a use of the BFD Echo
   function where the local system supports BFD but the neighboring
   system does not support BFD.

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 May 6, 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
   (https://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.  Updates to RFC 5880 . . . . . . . . . . . . . . . . . . . . .   3
   3.  Unaffiliated BFD Echo Procedures  . . . . . . . . . . . . . .   6
   4.  Unaffilicated BFD Echo Applicability  . . . . . . . . . . . .   7
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   8
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   8
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   To minimize the impact of device/link faults on services and improve
   network availability, a network device must be able to quickly detect
   faults in communication with adjacent devices.  Measures can then be
   taken to promptly rectify the faults to ensure service continuity.

   BFD [RFC5880] is a low-overhead, short-duration method to detect
   faults on the communication path between adjacent forwarding engines.
   The faults can be on interface, data link, and even forwarding
   engine.  It is a single, unified mechanism to monitor any media and
   protocol layers in real time.

   BFD defines Asynchronous mode to satisfy various deployment
   scenarios, and also supports Echo function to reduce the device
   requirement for BFD.  When the Echo function is activated, the local
   system sends BFD Echo packets and the remote system loops back the
   received Echo packets through the forwarding path.  If several
   consecutive BFD Echo packets are not received by the local system,
   then the BFD session is declared to be Down.

   When using BFD Echo function, there are two typical scenarios as
   below:

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      o Full BFD protocol capability with affiliated Echo function: this
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