Bidirectional Forwarding Detection (BFD) for EVPN Ethernet Segment Failover Use Case
draft-zwm-bess-es-failover-01

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BESS WG                                                         Z. Zhang
Internet-Draft                                                   Y. Wang
Intended status: Standards Track                               G. Mirsky
Expires: April 25, 2020                                  ZTE Corporation
                                                        October 23, 2019

   Bidirectional Forwarding Detection (BFD) for EVPN Ethernet Segment
                           Failover Use Case
                   draft-zwm-bess-es-failover-01.txt

Abstract

   This document introduces a method for fast switchover of Designated
   Forwarder for Ethernet Segment failover by using Bidirectional
   Forwarding Detection protocol.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on April 25, 2020.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions used in this document . . . . . . . . . . . . . .   3
     2.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  Requirements Language . . . . . . . . . . . . . . . . . .   3
   3.  Proposal  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Specification . . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  BDF changes . . . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   7.  Normative References  . . . . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   [RFC7432] introduces Ethernet Virtual Private Network (EVPN)
   technology.  Designated Forwarder (DF) election procedures for multi-
   homing Ethernet Segments has been described in it.  When PE (provider
   edge) receives BUM (Broadcast, Unknown Unicast and Multicast) flows,
   only DF forwards the BUM flows to CE (customer edge).  Non-DFs do not
   forward the BUM flows in order to avoid duplication.  If the link
   between DF and CE fails, another PE will forward the BUM flows after
   it is elected as DF.

   [RFC8584] defines the DF election framework, including that Backup
   Designated Forwarder (BDF) can be elected as the next best for the
   role.  But before the BDF is elected as DF, the BUM flows are
   discarded after the link between DF and CE fails.

                                          +-----+
                               +-----X----+ PE1 |
                               |          +--+--+
                               |
                             +-+--+
                             | CE |
                             +-+--+
                               |
                               |          +--+--+
                               +----------+ PE2 |
                                          +-----+

   For example, CE is multihomed to PE1 and PE2.  PE1 is elected as DF.
   All BUM flows are forwarded by PE1 when the link between PE1 and CE
   is operational.  When the link between PE1 and CE fails, the BUM
   flows are discarded until PE2 is elected as DF.

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   This document will use terminology defined in [RFC7432] and
   [I-D.ietf-bess-evpn-lsp-ping].

2.  Conventions used in this document

2.1.  Terminology

   BFD: Bidirectional Forwarding Detection
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