Multicast DF Election for EVPN based on bandwidth or quantity
draft-liu-bess-evpn-mcast-bw-quantity-df-election-01

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BESS Working Group                                           Yisong Liu
Internet Draft                                               Individual
Intended status: Standards Track                             M. McBride
Expires: May 26, 2020                                         Futurewei
                                                           Nov 26, 2019

       Multicast DF Election for EVPN based on bandwidth or quantity
            draft-liu-bess-evpn-mcast-bw-quantity-df-election-01

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Liu, et al.               Expires May, 2020                   [Page 1]
Internet-Draft   DF Election Based on BW or Quantity      November 2019

   Section 4.e of the Trust Legal Provisions and are provided without
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Abstract

   Ethernet Virtual Private Network (EVPN, RFC7432) is becoming
   prevalent in Data Centers, Data Center Interconnect (DCI) and
   Service Provider VPN applications. When multi-homing from a CE to
   multiple PEs, including links in an EVPN instance on a given
   Ethernet Segment, in an all-active redundancy mode, [RFC7432]
   describes a basic mechanism to elect a Designated Forwarder (DF),
   and [RFC8584] improves basic DF election by a HRW algorithm. [I-
   D.ietf-bess-evpn-per-mcast-flow-df-election] enhances the HRW
   algorithm for the multicast flows to perform DF election at the
   granularity of (ESI, VLAN, Mcast flow). This document specifies a
   new algorithm, based on multicast bandwidth utilization and
   multicast state quantity, in order for the multicast flows to elect
   a DF.

Table of Contents

   1. Introduction ................................................ 2
      1.1. Requirements Language .................................. 3
      1.2. Terminology ............................................ 4
   2. Solution .................................................... 4
      2.1. DF Election Based on Bandwidth ......................... 5
      2.2. DF Election Based on State Qunatity .................... 5
      2.3. Inconsistent Timing between Multi-homed PEs ............ 5
      2.4. Increase or Decrease of Multi-homed PEs ................ 6
         2.4.1. Decrease of Multi-homed PEs ....................... 6
         2.4.2. Increase of Multi-homed PEs ....................... 6
   3. BGP Encoding ................................................ 7
      3.1. DF Election Extended Community ......................... 7
      3.2. Multicast DF Extended Community ........................ 8
   4. Security Considerations  .................................... 8
   5. IANA Considerations ......................................... 8
   6. References .................................................. 9
      6.1. Normative References ................................... 9
      6.2. Informative References ................................. 9
   7. Acknowledgments ............................................. 9
   Authors? Addresses ............................................ 11

1. Introduction

   Ethernet Virtual Private Network (EVPN [RFC7432]) solutions are
   becoming prevalent in Data Centers, Data Center Interconnect (DCI)
   and Service Provider VPN applications. When multi-homing from a CE

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   to multiple PEs, with links in an EVPN instance on a given Ethernet
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