EVPN Network Layer Fault Management
draft-ietf-bess-evpn-bfd-03

Document Type Active Internet-Draft (bess WG)
Authors Vengada Govindan  , Mallik Mudigonda , Ali Sajassi  , Greg Mirsky  , Donald Eastlake 
Last updated 2021-02-22
Replaces draft-gmsm-bess-evpn-bfd
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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: August 21, 2021                               February 22, 2021

                  EVPN Network Layer Fault Management
                      draft-ietf-bess-evpn-bfd-03

Abstract

   This document specifies proactive, in-band network layer 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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   Drafts.

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

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...............................10
      6.1 MPLS Encapsulation....................................10
      6.1.1 Unicast MPLS Encapsulation..........................10
      6.1.2 MPLS Ingress Replication (MP2P).....................11
      6.1.3 MPLS LSM (Label Switched Multicast, P2MP)...........12
      6.2 VXLAN Encapsulation...................................12
      6.2.1 Unicast VXLAN Encapsulation.........................12
      6.2.2 VXLAN Ingress Replication (MP2P)....................14
      6.2.3 VXLAN LSM (Label Switched Multicast, P2MP)..........14

      7. Scalability Considerations.............................15

      8. IANA Considerations....................................16
      8.1 Pseudowire Associated Channel Type....................16
      8.2 MAC Addresses.........................................16
      8.3 BFD Discriminator Attribute Type......................16

      9. Security Considerations................................17

      Acknowledgements..........................................17

      Normative References......................................18
      Informative References....................................20

      Authors' Addresses........................................21

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

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 somewhat different fault
   detection mechanisms depending on the type of traffic and the type of
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