Per multicast flow Designated Forwarder Election for EVPN
draft-sajassi-bess-evpn-per-mcast-flow-df-election-01

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BESS WorkGroup                                              Ali. Sajassi
Internet-Draft                                         Mankamana. Mishra
Intended status: Standards Track                           Samir. Thoria
Expires: December 30, 2018                                 Cisco Systems
                                                          Jorge. Rabadan
                                                                   Nokia
                                                             John. Drake
                                                        Juniper Networks
                                                           June 28, 2018

       Per multicast flow Designated Forwarder Election for EVPN
         draft-sajassi-bess-evpn-per-mcast-flow-df-election-01

Abstract

   [RFC7432] describes mechanism to elect designated forwarder (DF) at
   the granularity of (ESI, EVI) which is per VLAN (or per group of
   VLANs in case of VLAN bundle or VLAN-aware bundle service).  However,
   the current level of granularity of per-VLAN is not adequate for some
   applications.[I-D.ietf-bess-evpn-df-election-framework] improves base
   line DF election by introducing HRW DF election.
   [I-D.ietf-bess-evpn-igmp-mld-proxy] introduces applicability of EVPN
   to Multicast flows, routes to sync them and a default DF election.
   This document is an extension to HRW base draft
   [I-D.ietf-bess-evpn-df-election-framework] and further enhances HRW
   algorithm for the Multicast flows to do DF election at the
   granularity of (ESI, VLAN, Mcast flow).

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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   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 December 30, 2018.

Sajassi, et al.         Expires December 30, 2018               [Page 1]
Internet-DraPer multicast flow Designated Forwarder Election   June 2018

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  The DF Election Extended Community  . . . . . . . . . . . . .   4
   4.  HRW base per multicast flow EVPN DF election  . . . . . . . .   6
     4.1.  DF election for IGMP (S,G) membership request . . . . . .   6
     4.2.  DF election for IGMP (*,G) membership request . . . . . .   7
     4.3.  Default DF election procedure . . . . . . . . . . . . . .   7
   5.  Procedure to use per multicast flow DF election algorithm . .   8
   6.  Triggers for DF re-election . . . . . . . . . . . . . . . . .   9
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   9.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  10
   10. Normative References  . . . . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  11

1.  Introduction

   EVPN based All-Active multi-homing is becoming the basic building
   block for providing redundancy in next generation data center
   deployments as well as service provider access/aggregation networks.
   [RFC7432] defines the role of a designated forwarder as the node in
   the redundancy group that is responsible to forward Broadcast,
   Unknown unicast, Multicast (BUM) traffic on that Ethernet Segment (CE
   device or network) in All-Active multi-homing.

   The default DF election mechanism allows selecting a DF at the
   granularity of (ES, VLAN) or (ES, VLAN bundle) for BUM traffic.
   While [I-D.ietf-bess-evpn-df-election-framework] improve on the
   default DF election procedure, some service provider residential
   applications require a finer granularity, where whole multicast flows