Multicast Source Redundancy in EVPN Networks
draft-skr-bess-evpn-redundant-mcast-source-00

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Last updated 2018-10-22
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BESS Workgroup                                           J. Rabadan, Ed.
Internet Draft                                               J. Kotalwar
                                                            S. Sathappan
Intended status: Standards Track                                   Nokia

                                                                E. Rosen
                                                                Z. Zhang
                                                                  W. Lin
                                                                 Juniper

Expires: April 25, 2019                                 October 22, 2018

              Multicast Source Redundancy in EVPN Networks
             draft-skr-bess-evpn-redundant-mcast-source-00

Abstract

   EVPN supports intra and inter-subnet IP multicast forwarding.
   However, EVPN (or conventional IP multicast techniques for that
   matter) do not have a solution for the case where a given multicast
   group carries more than one flow (i.e., more than one source), but
   where it is desired that each receiver gets only one of the several
   flows. Existing multicast techniques assume there are no redundant
   sources sending the same flows to the same IP multicast group, and,
   in case there were redundant sources, the receiver's application
   would deal with the received duplicated packets. This document
   extends the existing EVPN specifications and assumes that IP
   Multicast source redundancy may exist. It also assumes that, in case
   two or more sources send the same IP Multicast flows into the tenant
   domain, the EVPN PEs need to avoid that the receivers get packet
   duplication by following the described procedures.

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), its areas, and its working groups.  Note that
   other groups may also distribute working documents as Internet-
   Drafts.
 

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Internet-Draft           EVPN Redundant Sources         October 22, 2018

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   This Internet-Draft will expire on April 25, 2019.

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors. All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1. Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1 Terminology  . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.2 Background on IP Multicast Delivery in EVPN Networks . . . .  6
       1.2.1 Intra-subnet IP Multicast Forwarding . . . . . . . . . .  6
       1.2.2 Inter-subnet IP Multicast Forwarding . . . . . . . . . .  7
     1.3 Multi-Homed IP Multicast Sources in EVPN . . . . . . . . . .  9
     1.4 The Need for Redundant IP Multicast Sources in EVPN  . . . . 11
   2. Solution Overview . . . . . . . . . . . . . . . . . . . . . . . 11
   3. BGP EVPN Extensions . . . . . . . . . . . . . . . . . . . . . . 13
   4. Warm Standby (WS) Solution for Redundant G-Sources  . . . . . . 14
     4.1 WS Example in an OISM Network  . . . . . . . . . . . . . . . 15
     4.2 WS Example in a Single-BD Tenant Network . . . . . . . . . . 17
   5. Hot Standby (HS) Solution for Redundant G-Sources . . . . . . . 18
     5.1 Use of BFD in the HS Solution  . . . . . . . . . . . . . . . 21
     5.2 HS Example in an OISM Network  . . . . . . . . . . . . . . . 21
     5.3 HS Example in a Single-BD Tenant Network . . . . . . . . . . 25
 

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   6. Security Considerations . . . . . . . . . . . . . . . . . . . . 26
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