Reduction of EVPN C-MAC Overload
draft-wang-bess-evpn-cmac-overload-reduction-01

Document Type Active Internet-Draft (individual)
Author Yubao(Bob) Wang 
Last updated 2020-06-30
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BESS WG                                                          Y. Wang
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                             1 July 2020
Expires: 2 January 2021

                    Reduction of EVPN C-MAC Overload
            draft-wang-bess-evpn-cmac-overload-reduction-01

Abstract

   When there are too many customer-MACs (C-MACs), the RRs and/or ASBRs
   will be overloaded by the RT-2 routes for these MACs according to
   [RFC7432].  This issue can be simply solved by making the remote
   C-MAC entries learnt via data-plane MAC learning (like what PBB VPLS
   have done since [RFC7041]) rather than received from RT-2 routes.
   This simplified solution will works as well as PBB VPLS.  But this
   simplified solution will lose many important features that based on
   the ESI concept.  Because the ingress-ESI can't be learnt via data-
   plane MAC learning at the egress PE.  So when the data packets is
   forwarded following these MAC entries, they can't benefit from the
   EAD/EVI routes as per RFC7432.  So the All-Active Redundancy mode for
   ES can't be supported.  This make the simplified solution can't work
   as well as PBB EVPN ([RFC7623]).

   This document proposes some new extensions to [RFC7432] to achieve
   all-active mode ES redundancy on TPEs and reduce the C-MAC loads for
   RRs and ASBRs at the same time.  The new solution will work even more
   better than PBB EVPN under the help of these extensions, especially
   when there is no deployment of MPLS dataplane.

   In Section 6.2, this draft is compared with PBB EVPN and other
   solutions . These solutions are PBB EVPN, PBB VPLS, VXLAN([RFC7348]).

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
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Wang                     Expires 2 January 2021                 [Page 1]
Internet-Draft            EVPN C-MAC Reduction                 July 2020

   This Internet-Draft will expire on 2 January 2021.

Copyright Notice

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   document authors.  All rights reserved.

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   Please review these documents carefully, as they describe your rights
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements  . . . . . . . . . . . . . . . . . . . . . . . .   5
     2.1.  No C-MAC Awareness in the Backbone  . . . . . . . . . . .   6
     2.2.  EVPN IRB Support  . . . . . . . . . . . . . . . . . . . .   6
     2.3.  Unified Encapsulation per Scenario  . . . . . . . . . . .   6
     2.4.  ESI Features Remain Supported . . . . . . . . . . . . . .   6
     2.5.  Flexible Multi-homing Remains Supported . . . . . . . . .   7
     2.6.  C-MAC Address Learning and Confinement  . . . . . . . . .   7
     2.7.  No C-MAC Flushing for All-Active ESes . . . . . . . . . .   7
     2.8.  Independent C-MAC Flushing for Single-Active ESes . . . .   7
     2.9.  Independent Convergency per <ESI, EVI>  . . . . . . . . .   7
     2.10. Route Aggregation and Default Route in Backbone . . . . .   8
   3.  Solution Overview . . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  Common Overview . . . . . . . . . . . . . . . . . . . . .   8
     3.2.  Pseudo PBB EVPN . . . . . . . . . . . . . . . . . . . . .   8
     3.3.  VXLAN Solution Overview . . . . . . . . . . . . . . . . .  10
     3.4.  MPLS Solution Overview  . . . . . . . . . . . . . . . . .  12
     3.5.  SRv6 Solution Overview  . . . . . . . . . . . . . . . . .  13
     3.6.  Comparisons of Relative Concepts  . . . . . . . . . . . .  14
   4.  Dataplane-specific Procedures . . . . . . . . . . . . . . . .  15
     4.1.  Packet Walkthrough  . . . . . . . . . . . . . . . . . . .  15
     4.2.  Pseudo PBB-EVPN . . . . . . . . . . . . . . . . . . . . .  16
     4.3.  VXLAN over IP-VRF . . . . . . . . . . . . . . . . . . . .  17
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