EVPN Optimized Inter-Subnet Multicast (OISM) Forwarding
draft-lin-bess-evpn-irb-mcast-04

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Last updated 2017-10-24
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BESS                                                              W. Lin
Internet-Draft                                                  Z. Zhang
Intended status: Standards Track                                J. Drake
Expires: April 27, 2018                                    E. Rosen, Ed.
                                                  Juniper Networks, Inc.
                                                              J. Rabadan
                                                                   Nokia
                                                              A. Sajassi
                                                           Cisco Systems
                                                        October 24, 2017

        EVPN Optimized Inter-Subnet Multicast (OISM) Forwarding
                    draft-lin-bess-evpn-irb-mcast-04

Abstract

   Ethernet VPN (EVPN) provides a service that allows a single Local
   Area Network (LAN), i.e., a single IP subnet, to be distributed over
   multiple sites.  The sites are interconnected by an IP or MPLS
   backbone.  Intra-subnet traffic (either unicast or multicast) always
   appears to the endusers to be bridged, even when it is actually
   carried over the IP backbone.  When a single "tenant" owns multiple
   such LANs, EVPN also allows IP unicast traffic to be routed between
   those LANs.  This document specifies new procedures that allow inter-
   subnet IP multicast traffic to be routed among the LANs of a given
   tenant, while still making intra-subnet IP multicast traffic appear
   to be bridged.  These procedures can provide optimal routing of the
   inter-subnet multicast traffic, and do not require any such traffic
   to leave a given router and then reenter that same router.  These
   procedures also accommodate IP multicast traffic that needs to travel
   to or from systems that are outside the EVPN domain.

Status of This Memo

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Lin, et al.              Expires April 27, 2018                 [Page 1]
Internet-Draft               evpn-irb-mcast                 October 2017

   This Internet-Draft will expire on April 27, 2018.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Background  . . . . . . . . . . . . . . . . . . . . . . .   4
       1.1.1.  Segments, Broadcast Domains, and Tenants  . . . . . .   4
       1.1.2.  Inter-BD (Inter-Subnet) IP Traffic  . . . . . . . . .   5
       1.1.3.  EVPN and IP Multicast . . . . . . . . . . . . . . . .   6
       1.1.4.  BDs, MAC-VRFS, and EVPN Service Models  . . . . . . .   7
     1.2.  Need for EVPN-aware Multicast Procedures  . . . . . . . .   7
     1.3.  Additional Requirements That Must be Met by the Solution    8
     1.4.  Terminology . . . . . . . . . . . . . . . . . . . . . . .  10
     1.5.  Model of Operation: Overview  . . . . . . . . . . . . . .  12
       1.5.1.  Control Plane . . . . . . . . . . . . . . . . . . . .  12
       1.5.2.  Data Plane  . . . . . . . . . . . . . . . . . . . . .  14
   2.  Detailed Model of Operation . . . . . . . . . . . . . . . . .  16
     2.1.  Supplementary Broadcast Domain  . . . . . . . . . . . . .  16
     2.2.  When is a Route About/For/From a Particular BD  . . . . .  17
     2.3.  Use of IRB Interfaces at Ingress PE . . . . . . . . . . .  18
     2.4.  Use of IRB Interfaces at an Egress PE . . . . . . . . . .  19
     2.5.  Announcing Interest in (S,G)  . . . . . . . . . . . . . .  20
     2.6.  Tunneling Frames from Ingress PE to Egress PEs  . . . . .  21
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