Virtual Hub-and-Spoke in BGP EVPNs
draft-keyupate-bess-evpn-virtual-hub-02

Document Type Active Internet-Draft (candidate for bess WG)
Last updated 2019-09-04 (latest revision 2019-09-02)
Replaces draft-keyupate-evpn-virtual-hub
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BESS Working Group                                              K. Patel
                                                                  Arrcus
Internet Draft                                                A. Sajassi
Category: Standards Track                                          Cisco
                                                                J. Drake
                                                                Z. Zhang
                                                        Juniper Networks
                                                           W. Henderickx
                                                                   Nokia

Expires: March 02, 2020                               September 02, 2019

                  Virtual Hub-and-Spoke in BGP EVPNs
                draft-keyupate-bess-evpn-virtual-hub-02

Abstract

   Ethernet Virtual Private Network (EVPN) solution is becoming
   pervasive for Network Virtualization Overlay (NVO) services in data
   center (DC) applications and as the next generation virtual private
   LAN services in service provider (SP) applications.

   The use of host IP default route and host unknown MAC route within a
   DC is well understood in order to ensure that leaf nodes within a DC
   only learn and store host MAC and IP addresses for that DC. All other
   host MAC and IP addresses from remote DCs are learned and stored in
   DC GW nodes thus alleviating leaf nodes from learning host MAC and IP
   addresses from the remote DCs.

   This draft further optimizes the MAC and IP address learning at the
   leaf nodes such that a leaf node within a DC only needs to learn and
   store MAC and IP addresses associated with the sites directly
   connected to it. A leaf node does not need to learn and store MAC and
   IP addresses from any other leaf nodes thus reducing the number of
   learned MACs and IP addresses per EVI substantially.

   The modifications provided by this draft updates and extends RFC7024
   for BGP EVPN Address Family.

Status of this Memo

   This Internet-Draft is submitted to IETF 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

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Copyright and License Notice

   Copyright (c) 2015 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  Requirements Language  . . . . . . . . . . . . . . . . . . . .  5
   3.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  5
   4.  Routing Information Exchange for EVPN routes . . . . . . . . .  5
   5.  EVPN unknown MAC route . . . . . . . . . . . . . . . . . . . .  6
     5.1.  Originating EVPN Unknown MAC Route by a V-Hub  . . . . . .  6
     5.2.  Processing VPN-MAC EVPN unknown Route by a V-SPOKE . . . .  6
     5.3.  Aliasing . . . . . . . . . . . . . . . . . . . . . . . . .  7
     5.4.  Split-Horizon & Mass Withdraw  . . . . . . . . . . . . . .  8
   6.  Forwarding Considerations  . . . . . . . . . . . . . . . . . .  8
     6.1.  IP-only Forwarding . . . . . . . . . . . . . . . . . . . .  8
     6.2.  MAC-only Forwarding - Bridging . . . . . . . . . . . . . .  8
     6.3.  MAC and IP Forwarding - IRB  . . . . . . . . . . . . . . .  8
   7.  Handling of Broadcast and Multicast traffic  . . . . . . . . .  9
     7.1.  Split Horizon  . . . . . . . . . . . . . . . . . . . . . . 10
     7.2.  Route Advertisement  . . . . . . . . . . . . . . . . . . . 10

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