PE-CE Control Plane for EVPN
draft-malhotra-bess-evpn-pe-ce-00

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BESS Working Group                                      N. Malhotra, Ed.
Internet Draft                                                Individual
Intended Status: Proposed Standard                                      
                                                                K. Patel
                                                                  Arrcus

                                                              J. Rabadan
                                                                   Nokia

Expires: May 5, 2020                                         Nov 2, 2019

                      PE-CE Control Plane for EVPN
                   draft-malhotra-bess-evpn-pe-ce-00

Abstract

   In an EVPN network, EVPN PEs provide VPN bridging and routing service
   to connected CE devices based on BGP EVPN control plane. At present,
   there is no PE-CE control plane defined for an EVPN PE to learn CE
   MAC, IP, and any other routes from a CE that may be distributed in
   EVPN control plane to enable unicast flows between CE devices. As a
   result, EVPN PEs rely on data plane based gleaning of source MACs for
   CE MAC learning, ARP/ND snooping for CE IPv4/IPv6 learning, and in
   some cases, local configuration for learning prefix routes behind a
   CE. A PE-CE control plane alternative to this traditional learning
   approach, where applicable, offers certain distinct advantages that
   in turn result in simplified EVPN operation. 

   This document defines a PE-CE control plane as an optional
   alternative to traditional non-control-plane based PE-CE learning in
   an EVPN network. It defines PE-CE control plane procedures and TLVs
   based on L3DL as the base protocol, enumerates advantages that may be
   achieved by using this PE-CE control plane, and discusses in detail
   EVPN use cases that are simplified as a result.

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
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   Internet-Drafts.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
 

malhotra et al.           Expires May 5, 2020                   [Page 1]
INTERNET DRAFT        PE-CE Control Plane for EVPN                      

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Copyright and License Notice

   Copyright (c) 2017 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
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     1.1  Terminology . . . . . . . . . . . . . . . . . . . . . . . .  5
   2. PE <-> CE Control Plane Overview  . . . . . . . . . . . . . . .  7
   3. TLVs  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  9
     3.1 Overlay IPv4 Encapsulation PDU . . . . . . . . . . . . . . .  9
     3.2 Overlay IPv6 Encapsulation PDU . . . . . . . . . . . . . . . 11
     3.3 Overlay IPv4 Prefix Encapsulation PDU  . . . . . . . . . . . 13
     3.4 Overlay IPv6 Prefix Encapsulation PDU  . . . . . . . . . . . 14
   4. CE MAC/IP Learning on a PE AC . . . . . . . . . . . . . . . . . 15
     4.1 PE <-> CE L3DL Session Establishment . . . . . . . . . . . . 15
     4.2 CE MAC/IP Learning . . . . . . . . . . . . . . . . . . . . . 15
   5. PE Any-cast GW MAC/IP Learning on CE  . . . . . . . . . . . . . 15
   6. Remote CE MAC/IP Learning on CE . . . . . . . . . . . . . . . . 16
   7. PE <-> CE Control Plane with EVPN All-active Multi-Homing . . . 17
     7.1 All-active Multi-Homing Mode . . . . . . . . . . . . . . . . 17
     7.2 Source MAC . . . . . . . . . . . . . . . . . . . . . . . . . 18
     7.3 CE MAC/IP Learning with EVPN All-active Multi-Homing . . . . 18
     7.4 LAG Member Link Failure  . . . . . . . . . . . . . . . . . . 19
       7.4.1 Session Re-establishment . . . . . . . . . . . . . . . . 19