Fast failure detection in VRRP with Point to Point BFD
draft-nitish-vrrp-bfd-p2p-00

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Last updated 2017-08-30
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Network Working Group                                           N. Gupta
Internet-Draft                                                  A. Dogra
Intended status: Standards Track                     Cisco Systems, Inc.
Expires: March 3, 2018                                       C. Docherty

                                                               G. Mirsky
                                                             J. Tantsura
                                                              Individual
                                                         August 30, 2017

         Fast failure detection in VRRP with Point to Point BFD
                      draft-nitish-vrrp-bfd-p2p-00

Abstract

   This document describes how Point to Point Bidirectional Forwarding
   Detection (BFD) can be used to support sub-second detection of a
   Master Router failure in the Virtual Router Redundancy Protocol
   (VRRP).

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   This Internet-Draft will expire on March 3, 2018.

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   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
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   to this document.  Code Components extracted from this document must
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Requirements Language  . . . . . . . . . . . . . . . . . . . .  4
   3.  Applicability of Point to Point BFD  . . . . . . . . . . . . .  5
     3.1.  Extension to VRRP protocol . . . . . . . . . . . . . . . .  5
     3.2.  VRRP Peer Table  . . . . . . . . . . . . . . . . . . . . .  6
     3.3.  VRRP BACKUP ADVERTISEMENT Packet Type  . . . . . . . . . .  7
     3.4.  Sample configuration . . . . . . . . . . . . . . . . . . .  8
     3.5.  Critical BFD session . . . . . . . . . . . . . . . . . . .  9
     3.6.  Protocol State Machine . . . . . . . . . . . . . . . . . .  9
       3.6.1.  Parameters Per Virtual Router  . . . . . . . . . . . .  9
       3.6.2.  Timers . . . . . . . . . . . . . . . . . . . . . . . . 10
       3.6.3.  VRRP State Machine with Point to Point BFD . . . . . . 10
   4.  Scalability Considerations . . . . . . . . . . . . . . . . . . 20
   5.  Operational Considerations . . . . . . . . . . . . . . . . . . 21
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 22
     6.1.  A New Name Space for VRRP Packet Types . . . . . . . . . . 22
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 23
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 24
   9.  Normative References . . . . . . . . . . . . . . . . . . . . . 25
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 26

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1.  Introduction

   The Virtual Router Redundancy Protocol (VRRP) provides redundant
   Virtual gateways in the Local Area Network (LAN), which is typically
   the first point of failure for end-hosts sending traffic out of the
   LAN.  Fast failure detection of VRRP Master is critical in supporting
   high availability of services and improved Quality of Experience to
   users.  In VRRP [RFC5798] specification, Backup routers depend on
   VRRP packets generated at a regular interval by the Master router, to
   detect the health of the VRRP Master.  Faster failure detection can
   be achieved within VRRP protocol by reducing the Advertisement
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