Reduction of EVPN C-MAC Overload
draft-wang-bess-evpn-cmac-overload-reduction-00

Document Type Active Internet-Draft (individual)
Last updated 2020-05-17
Stream (None)
Intended RFC status (None)
Formats plain text xml pdf htmlized (tools) htmlized bibtex
Stream Stream state (No stream defined)
Consensus Boilerplate Unknown
RFC Editor Note (None)
IESG IESG state I-D Exists
Telechat date
Responsible AD (None)
Send notices to (None)
BESS WG                                                          Y. Wang
Internet-Draft                                           ZTE Corporation
Intended status: Standards Track                            May 17, 2020
Expires: November 18, 2020

                    Reduction of EVPN C-MAC Overload
            draft-wang-bess-evpn-cmac-overload-reduction-00

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
   [I-D.dawra-bess-srv6-services].  This issue can be simply solved by
   making the remote C-MAC entries learnt via data-plane MAC learning
   (like what PBB VPLS have been 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 a new SRv6 function type and an extension to
   [I-D.dawra-bess-srv6-services] to achieve all-active mode ES
   redundancy on TPEs and reduce the C-MAC loads for RRs and ASBRs.  The
   new solution will work even more better than PBB EVPN under the help
   of these extensions.

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
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on November 18, 2020.

Wang                    Expires November 18, 2020               [Page 1]
Internet-Draft            EVPN C-MAC Reduction                  May 2020

Copyright Notice

   Copyright (c) 2020 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
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Control Plane . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Dataplane . . . . . . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  PE1 forward ARP Request to PE2/PE3  . . . . . . . . . . .   5
     3.2.  PE2/PE3's Dataplane MAC Learning  . . . . . . . . . . . .   5
     3.3.  PE2 Discard ARP Request to CE1  . . . . . . . . . . . . .   6
     3.4.  PE3 Forward ARP Replay to PE1/PE2 . . . . . . . . . . . .   6
     3.5.  PE1 Forward ARP Replay to CE1 . . . . . . . . . . . . . .   6
   4.  ESI Indicator Advertisement Optimization  . . . . . . . . . .   6
   5.  C-MAC Flush Notification Procedure  . . . . . . . . . . . . .   7
   6.  E-Tree Support Considerations . . . . . . . . . . . . . . . .   7
   7.  EVPN IRB Support Considerations . . . . . . . . . . . . . . .   7
   8.  Use End.ESI SID in MAC/IP Advertisement Routes  . . . . . . .   7
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     11.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     11.2.  Informative References References  . . . . . . . . . . .   8
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   9

1.  Introduction

   In [I-D.dawra-bess-srv6-services], an extension to [RFC7432] is
   proposed for SRv6 EVPN control-plane.  In this control-plane the
   C-MACs is advertised via RT-2 route, but in order to solve the C-MAC
   overload problem for RRs and ASBRs, we have to return to a PBB-like
   dataplane C-MAC learning procedures.

   This document introduce an "ESI Indicator" concept to the EVPN data-
Show full document text