EVPN BUM Using BIER
draft-ietf-bier-evpn-02

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Last updated 2019-11-04
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BIER                                                            Z. Zhang
Internet-Draft                                             A. Przygienda
Intended status: Standards Track                        Juniper Networks
Expires: May 7, 2020                                          A. Sajassi
                                                           Cisco Systems
                                                              J. Rabadan
                                                                   Nokia
                                                        November 4, 2019

                          EVPN BUM Using BIER
                        draft-ietf-bier-evpn-02

Abstract

   This document specifies protocols and procedures for forwarding
   broadcast, unknown unicast and multicast (BUM) traffic of Ethernet
   VPNs (EVPN) using Bit Index Explicit Replication (BIER).

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC2119.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on May 7, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Zhang, et al.              Expires May 7, 2020                  [Page 1]
Internet-Draft                  bier-evpn                  November 2019

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (https://trustee.ietf.org/license-info) in effect on the date of
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminologies . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Use of the PMSI Tunnel Attribute  . . . . . . . . . . . . . .   4
     2.1.  Auxiliary Information . . . . . . . . . . . . . . . . . .   5
     2.2.  Explicit Tracking . . . . . . . . . . . . . . . . . . . .   6
       2.2.1.  Using IMET/SMET routes  . . . . . . . . . . . . . . .   6
       2.2.2.  Using S-PMSI/Leaf A-D Routes  . . . . . . . . . . . .   6
     2.3.  MPLS Label in PTA . . . . . . . . . . . . . . . . . . . .   7
   3.  Multihoming Split Horizon . . . . . . . . . . . . . . . . . .   8
   4.  Data Plane  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     4.1.  Encapsulation and Transmission  . . . . . . . . . . . . .   8
       4.1.1.  At a BFIR that is an Ingress PE . . . . . . . . . . .   8
       4.1.2.  At a BFIR that is a P-tunnel Segmentation Point . . .  10
     4.2.  Disposition . . . . . . . . . . . . . . . . . . . . . . .  11
       4.2.1.  At a BFER that is an Egress PE  . . . . . . . . . . .  11
       4.2.2.  At a BFER that is a P-tunnel Segmentation Point . . .  11
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  11
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  12
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     8.2.  Informative References  . . . . . . . . . . . . . . . . .  13
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  14

1.  Introduction

   [RFC7432] and [RFC8365] specify the protocols and procedures for
   Ethernet VPNs (EVPNs).  For broadcast, unknown unicast and multicast
   (BUM) traffic, provider/underlay tunnels (referred to as P-tunnels)
   are used to carry the BUM traffic.  Several kinds of tunnel
   technologies can be used, as specified in [RFC7432].

   Bit Index Explicit Replication (BIER) ([RFC8279]) is an architecture
   that provides optimal multicast forwarding through a "multicast
   domain", without requiring intermediate routers to maintain any per-
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