Bidirectional Forwarding Detection (BFD) for Multi-point Networks and Virtual Router Redundancy Protocol (VRRP) Use Case
draft-mirsky-bfd-p2mp-vrrp-use-case-04

Document Type Active Internet-Draft (individual)
Authors Greg Mirsky  , Jeff Tantsura 
Last updated 2020-07-27
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BFD Working Group                                              G. Mirsky
Internet-Draft                                                 ZTE Corp.
Updates: 5798 (if approved)                                  J. Tantsura
Intended status: Standards Track                                  Apstra
Expires: January 28, 2021                                  July 27, 2020

 Bidirectional Forwarding Detection (BFD) for Multi-point Networks and
           Virtual Router Redundancy Protocol (VRRP) Use Case
                 draft-mirsky-bfd-p2mp-vrrp-use-case-04

Abstract

   This document discusses the use of Bidirectional Forwarding Detection
   (BFD) for multipoint networks to provide Virtual Router Redundancy
   Protocol (VRRP) with sub-second Master convergence and defines the
   extension to bootstrap point-to-multipoint BFD session.

   This draft updates RFC 5798.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on January 28, 2021.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Conventions used in this document . . . . . . . . . . . .   2
       1.1.1.  Terminology . . . . . . . . . . . . . . . . . . . . .   3
       1.1.2.  Requirements Language . . . . . . . . . . . . . . . .   3
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Applicability of p2mp BFD . . . . . . . . . . . . . . . . . .   3
     3.1.  Multipoint BFD Encapsulation  . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The [RFC5798] is the current specification of the Virtual Router
   Redundancy Protocol (VRRP) for IPv4 and IPv6 networks.  VRRPv3 allows
   for a faster switchover to a Backup router.  Using such capability
   with the software-based implementation of VRRP may prove challenging.
   But it still may be possible to deploy VRRP and provide sub-second
   detection of Master router failure by Backup routers.

   Bidirectional Forwarding Detection (BFD) [RFC5880] had been
   originally defined detect failure of point-to-point (p2p) paths:
   single-hop [RFC5881], multihop [RFC5883].  Single-hop BFD may be used
   to enable Backup routers to detect a failure of the Master router
   within 100 msec or faster.

   [RFC8562] extends [RFC5880] for multipoint and multicast networks,
   which is precisely characterizes deployment scenarios for VRRP over
   LAN segment.  This document demonstrates how point-to-multipoint
   (p2mp) BFD can enable faster detection of Master failure and thus
   minimize service disruption in a VRRP domain.  The document also
   defines the extension to VRRP [RFC5798] to bootstrap a VRRP Backup
   router to join in p2mp BFD session.

1.1.  Conventions used in this document

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1.1.1.  Terminology

   BFD: Bidirectional Forwarding Detection

   p2mp: Pont-to-Multipoint

   VRRP: Virtual Router Redundancy Protocol

1.1.2.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
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