ARP/ND Synching And IP Aliasing without IRB
draft-wang-bess-evpn-arp-nd-synch-without-irb-00

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BESS WG                                                          Y. Wang
Internet-Draft                                                  Z. Zhang
Intended status: Standards Track                         ZTE Corporation
Expires: October 27, 2019                                 April 25, 2019

              ARP/ND Synching And IP Aliasing without IRB
            draft-wang-bess-evpn-arp-nd-synch-without-irb-00

Abstract

   This draft proposes an extension to [RFC7432] to do ARP synchronizing
   and IP aliasing for Layer 3 routes that is needed for pure L3 EVPN to
   build a complete IP ECMP.  The phrase "pure L3 EVPN" means that there
   is no MAC-VRF or IRB interface in the use case.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on October 27, 2019.

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Internet-Draft          EVPN ARP/ND Synch no IRB              April 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  ARP/ND Synching and IP Aliasing . . . . . . . . . . . . . . .   3
     2.1.  Constructing MAC/IP Advertisement Route . . . . . . . . .   4
     2.2.  Constructing IP-EAD/EVI Route . . . . . . . . . . . . . .   5
     2.3.  Constructing EAD/ES Route . . . . . . . . . . . . . . . .   5
   3.  Fast Convergence for Routed Traffic . . . . . . . . . . . . .   5
   4.  Determining Reach-ability to Unicast IP Addresses . . . . . .   6
   5.  Forwarding Unicast Packets  . . . . . . . . . . . . . . . . .   6
   6.  Load Balancing of Unicast Packets . . . . . . . . . . . . . .   6
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   7

1.  Introduction

   [I-D.sajassi-bess-evpn-ip-aliasing] proposes an extension to
   [RFC7432] to do aliasing for Layer 3 routes that is needed for
   symmetric IRB to build a complete IP ECMP.  But typically there may
   be both IRB interfaces(to do EVPN IRB per-MAC-VRF basis) and VRF-
   interfaces in the same IP-VRF instance.  It is necessary to apply the
   EVPN control-plane to the VRF-interfaces in order to support both
   such situations and the pure L3 EVPN use case where no IRB interfaces
   will be found in the IP-VRF instances.

                                      +---------+
                   +-------------+    |         |
                   |             |    |         |
                  /|    PE1      |----|         |   +-------------+
                 / |             |    |  MPLS/  |   |             |
            LAG /  +-------------+    |  VxLAN/ |   |     PE3     |---H3
   H1---SW1=====                      |  NVGRE/ |   |             |
       /        \  +-------------+    |  SRv6   |---|             |
     H2          \ |             |    |         |   +-------------+
                  \|     PE2     |----|         |
                   |             |    |         |
                   +-------------+    |         |
                                      |         |
                                      |         |
                                      +---------+

         Figure 1: ARP/ND Synchronizing and IP Aliasing without IRB

   Consider a pair of multi-homed PEs PE1 and PE2.  Let there be two
   hosts H1 and H2 attached to them via a L2 switch SW1.  Consider

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