Multicast DF Election for EVPN Based on bandwidth or quantity
draft-liu-bess-evpn-mcast-bw-quantity-df-election-00

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Last updated 2018-12-09
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BESS Working Group                                           Yisong Liu
Internet Draft                                               M. McBride
Intended status: Standards Track                    Huawei Technologies
Expires: June 10, 2019                                December 10, 2018

       Multicast DF Election for EVPN Based on bandwidth or quantity
            draft-liu-bess-evpn-mcast-bw-quantity-df-election-00

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Abstract

Liu                      Expires June, 2019                   [Page 1]
Internet-Draft   DF Election Based on BW or quantity      December 2018

   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 [I-D.ietf-bess-
   evpn-df-election-framework] 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 ............................................ 3
   2. Solution .................................................... 4
      2.1. DF Election Based on Bandwidth ......................... 4
      2.2. DF Election Based on State Quantity .................... 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 ........................ 7
   4. Security Considerations ..................................... 8
   5. IANA Considerations ......................................... 8
   6. References .................................................. 8
      6.1. Normative References ................................... 8
      6.2. Informative References ................................. 9
   7. Acknowledgments ............................................. 9

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
   to multiple PEs, with links in an EVPN instance on a given Ethernet
   Segment (ES), in an all-active redundancy mode, [RFC7432] defines
   the role of Designated Forwarder (DF) as the node that is
   responsible to forward multicast flows.

Liu                      Expires June, 2019                   [Page 2]
Internet-Draft   DF Election Based on BW or quantity      December 2018
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