Fault Management for EVPN networks
draft-gmsm-bess-evpn-bfd-03

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Last updated 2019-07-06
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INTERNET-DRAFT                                               V. Govindan
Intended status: Proposed Standard                          M. Mudigonda
                                                              A. Sajassi
                                                           Cisco Systems
                                                               G. Mirsky
                                                                     ZTE
                                                             D. Eastlake
                                                  Futurewei Technologies
Expires: January 5, 2020                                  July 6, 2019

                   Fault Management for EVPN networks
                      draft-gmsm-bess-evpn-bfd-03

Abstract

   This document specifies proactive, in-band network OAM mechanisms to
   detect loss of continuity and miss-connection faults that affect
   unicast and multi-destination paths (used by Broadcast, Unknown
   Unicast and Multicast traffic) in an Ethernet VPN (EVPN) network.
   The mechanisms specified in the draft are based on the widely adopted
   Bidirectional Forwarding Detection (BFD) protocol.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Distribution of this document is unlimited. Comments should be sent
   to the authors or the BESS working group mailing list: bess@ietf.org.

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Govindan, et al                                                 [Page 1]
Internet-Draft                                 Fault Management for EVPN

Table of Contents

      1. Introduction............................................3
      1.1 Terminology............................................3

      2. Scope of this Document..................................5
      3. Motivation for Running BFD at the EVPN Network Layer....6
      4. Fault Detection for Unicast Traffic.....................7

      5. Fault Detection for BUM Traffic.........................8
      5.1 Ingress Replication....................................8
      5.2 P2MP Tunnels (Label Switched Multicast)................8

      6. BFD Packet Encapsulation................................9
      6.1 MPLS Encapsulation.....................................9
      6.1.1 Unicast..............................................9
      6.1.2 Ingress Replication.................................10
      6.1.3 LSM (Label Switched Multicast, P2MP)................11
      6.2 VXLAN Encapsulation...................................11
      6.2.1 Unicast.............................................11
      6.2.2 Ingress Replication.................................13
      6.2.3 LSM (Label Switched Multicast, P2MP)................13

      7. BGP Distribution of BFD Discriminators.................14
      8. Scalability Considerations.............................14

      9. IANA Considerations....................................15
      9.1 Pseudowire Associated Channel Type....................15
      9.2 MAC Address...........................................15

      10. Security Considerations...............................15

      Acknowledgement...........................................15

      Normative References......................................16
      Informative References....................................18

      Authors' Addresses........................................19

Govindan, et al                                                 [Page 2]
Internet-Draft                                 Fault Management for EVPN

1. Introduction

   [ietf-bess-evpn-oam-req-frmwk] outlines the OAM requirements of
   Ethernet VPN networks (EVPN [RFC7432]).  This document specifies
   mechanisms for proactive fault detection at the network (overlay)
   layer of EVPN. The mechanisms proposed in the draft use the widely
   adopted Bidirectional Forwarding Detection (BFD [RFC5880]) protocol.

   EVPN fault detection mechanisms need to consider unicast traffic
   separately from Broadcast, Unknown Unicast, and Multicast (BUM)
   traffic since they map to different Forwarding Equivalency Classes
   (FECs) in EVPN. Hence this document proposes different fault
   detection mechanisms to suit each type, for unicast traffic using BFD
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